Cat. No. 19-1126
OWNER’S MANUAL
HTX-242 TWO-METER MOBILE TRANS-
CEIVER
Please read before using this transceiver.
Program m able Frequ en cy St ep —lets you set th e frequ en cy step
for tu n in g or scan n in g to 5, 10, 12.5, 20, 25, 50, or 100 kHz.
Ext en ded Ban d Coverage —receives from 136 to 174 MHz an d
lets you exten d tran sm it coverage to in clu de 2-Meter h am , MARS
(Military Am ateu r Radio Service), an d CAP (Civil Air Patrol).
Du al VFO (Variable-Frequ en cy Oscillat or) an d Du plex Modes —
two in depen den t VFOs let you qu ickly select between two directly-
en tered frequ en cies. You can also u se on e of th e VFOs as a
repeater in pu t frequ en cy an d th e oth er as a repeater ou tpu t fre-
qu en cy for odd-split repeaters.
Using this Ma nua l
To m ake th is m an u al as easy to u se as possible, we give you sev-
eral ways to fin d in form ation .
Con t en t s —lists all section s in th e order th ey appear in th e m an -
u al.
Un d er s t a n d in g t h e Disp la y —lists all display in dicators an d gives
a brief explain ation an d n otes th e section s wh ere th e in dicator is
fu lly explain ed.
Us in g t h e Men u —lists th e option s in th e con figu ration m en u an d
gives th e page n u m bers wh ere th e option s are discu ssed.
Qu ick Referen ce Card —gives brief in stru ction s for m ost fu n c-
tion s.
Type Con ven t ion s —m ake th e referen ces to keys an d displays
easier to fin d in th e text:
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Keys are bold. For exam ple, VFO.
Wh en a key h as m ore th an on e m arkin g (for exam ple, DTMF
an d ALM refer to th e sam e key), we refer to th e key by th e
n am e appropriate to th e task.
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Wh ere you are in stru cted to press two keys at on ce, th e keys
are separated by a + sym bol. For exam ple, F+DTMF.
Text an d sym bols th at appear on th e tran sceiver’s display
appear in a special typeface. For exam ple, 144.940.
Im portan t n otes in th is m an u al h ave a large exclam ation m ark (!)
in th e m argin . Warn in gs an d cau tion s you sh ou ld follow to preven t
in ju ry to a person or dam age to th e tran sceiver h ave a large ligh t-
n in g bolt ( ) in th e m argin .
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CONTENTS
In st allat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Un packin g th e Tran sceiver . . . . . . . . . . . . . . . . . . . . . . . . . 6
Con n ectin g th e Microph on e . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mou n tin g th e HTX-242 in a Veh icle . . . . . . . . . . . . . . . . . . . 7
Con n ectin g an An ten n a . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Con n ectin g to you r Veh icle’s Power . . . . . . . . . . . . . . . . . . . 9
Usin g th e HTX-242 as a Base Station . . . . . . . . . . . . . . . . 10
Usin g th e HTX-242 with Packet Radio . . . . . . . . . . . . . . . . 11
Con n ectin g an Extern al Speaker (Option al) . . . . . . . . . . . . 11
Un derst an din g t h e HTX-2 4 2 . . . . . . . . . . . . . . . . . . . . . . . 1 2
Du al VFO Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
DTMF (Tou ch -Ton e) Featu res . . . . . . . . . . . . . . . . . . . . . . 12
Su bau dible Ton e (CTCSS) Featu res . . . . . . . . . . . . . . . . . . 13
Repeater Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Mem ory Ch an n els . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Un derstan din g th e Display . . . . . . . . . . . . . . . . . . . . . . . . 14
Basic Operat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 6
Tu rn in g On / Off You r HTX-242 . . . . . . . . . . . . . . . . . . . . . 16
Resettin g th e HTX-242 . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Exten din g th e Tran sm it Frequ en cy Ran ge . . . . . . . . . . . . . 16
Settin g Volu m e an d Squ elch . . . . . . . . . . . . . . . . . . . . . . . 17
Usin g th e Ligh t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Settin g th e Power Level . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Lockin g th e Con trols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Selectin g a Frequ en cy . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Directly En terin g a Frequ en cy . . . . . . . . . . . . . . . . . . . 18
Tu n in g to a Frequ en cy . . . . . . . . . . . . . . . . . . . . . . . . 18
Scan n in g for a Frequ en cy . . . . . . . . . . . . . . . . . . . . . . 19
Settin g th e Frequ en cy Step . . . . . . . . . . . . . . . . . . . . . . . . 19
Settin g th e Scan Option s . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Storin g Scan Skip Frequ en cies . . . . . . . . . . . . . . . . . . 20
Settin g th e Scan Resu m e Con dition . . . . . . . . . . . . . . 20
Settin g th e Scan Resu m e Delay . . . . . . . . . . . . . . . . . . 21
Settin g th e Scan n in g Ran ge . . . . . . . . . . . . . . . . . . . . 21
Receivin g Tran sm ission s . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Tran sm ittin g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Man u ally Tran sm ittin g DTMF Ton es . . . . . . . . . . . . . . 23
Tran sm ittin g DTMF Ton es from Mem ory . . . . . . . . . . . 23
Lim itin g Tran sm it Du ration . . . . . . . . . . . . . . . . . . . . 24
Tu rn in g th e Keyton e Beep On an d Off . . . . . . . . . . . . . . . . 24
4
Advan ced Operat ion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 5
Frequ en cy Offset Defau lts . . . . . . . . . . . . . . . . . . . . . . . . . 25
Tu rn in g Au to Du plex On an d Off . . . . . . . . . . . . . . . . 25
Ch an gin g th e Defau lt Offset . . . . . . . . . . . . . . . . . . . . 26
Reversin g th e Offset . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Overridin g th e Du plex Offset . . . . . . . . . . . . . . . . . . . . 26
Usin g th e Du al VFOs for Du plex Operation . . . . . . . . . . . . 27
Usin g Mem ory Ch an n els . . . . . . . . . . . . . . . . . . . . . . . . . . 2 8
Storin g a Frequ en cy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Ch an gin g Stored Settin gs . . . . . . . . . . . . . . . . . . . . . . . . . 28
Usin g Au to Mem ory Store (AMS) . . . . . . . . . . . . . . . . . . . . 29
Tu n in g to a Stan dard Mem ory Ch an n el . . . . . . . . . . . . . . . 30
Usin g th e Callin g-Frequ en cy Mem ory . . . . . . . . . . . . . . . . 30
Ch eckin g Priority Ch an n el 1 . . . . . . . . . . . . . . . . . . . . . . . 30
Scan n in g Mem ory Ch an n els . . . . . . . . . . . . . . . . . . . . . . . 31
Clearin g a Mem ory Ch an n el . . . . . . . . . . . . . . . . . . . . . . . 31
En ablin g/ Disablin g Scan n in g for Mem ory Ch an n els . . . . . 31
Usin g DTMF an d Su bau dible Ton es . . . . . . . . . . . . . . . . . . 3 2
Storin g a DTMF Sequ en ce . . . . . . . . . . . . . . . . . . . . . . . . . 32
Tran sm ittin g a DTMF Sequ en ce . . . . . . . . . . . . . . . . . . . . 32
Usin g DTMF Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Usin g Grou p Callin g . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Usin g Au to-Reply . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Usin g DTMF Au to Sen d . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Usin g Su bau dible Ton es . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Valid Su bau dible Ton es . . . . . . . . . . . . . . . . . . . . . . . 36
Settin g th e Su bau dible Ton es . . . . . . . . . . . . . . . . . . . 36
Activatin g Su bau dible Ton e Tran sm it an d Squ elch . . . 37
Settin g th e DTMF Page an d Su bau dible Ton e Alert . . . . . . 37
Usin g t h e Men u . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 8
Trou blesh oot in g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 0
Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Com m on Problem s an d Solu tion s . . . . . . . . . . . . . . . . . . . 40
Replacin g th e Fu se . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Specificat ion s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2
Sch em at ics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4
5
INSTALLATION
Unp a c king the Tra nsc e ive r
As you u n pack th e tran sceiver, ch eck to be su re you h ave all th e
item s sh own in th is illu stration .
Conne c ting the Mic rop hone
Plu g th e m icroph on e’s con n ector in to th e m icroph on e jack, secu re
th e m icroph on e h older to eith er th e left or righ t side of th e tran s-
ceiver, th en clip th e m icroph on e to th e h older.
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Mounting the HTX-242 in a Ve hic le
Wh en you select a m ou n tin g location for th e HTX-242, be su re:
You can easily reach it
No wires or cables will in terfere with th e veh icle’s operation
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It is n ot directly in fron t of h eatin g ven ts
All wires will reach th eir con n ection poin ts
Cautions:
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To avoid damaging your vehicle’s electronic systems, contact your
vehicle’s manufacturer before you install the HTX-242 to find out
about the proper transceiver mounting locations, antenna loca-
tions, and power and antenna cable routing guidelines.
Do not apply power to the transceiver until after you properly
mount and connect an antenna.
Use th e su pplied screws, m etal wash ers, bracket, ru bber wash ers,
an d m ou n tin g kn obs, as sh own , to m ou n t th e tran sceiver.
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Conne c ting a n Ante nna
You can con n ect a variety of an ten n as for both m obile an d base-
station u se (see “Usin g th e HTX-242 as a Base Station ” on
Page 10). Each type of an ten n a h as its ben efits. Ch oose on e th at
best m eets you r n eeds.
Wh en decidin g on a m obile or base-station an ten n a an d its loca-
tion , con sider th e followin g:
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Th e an ten n a sh ou ld be as h igh as possible on you r veh icle or
h ou se.
•
Th e an ten n a an d an ten n a cable sh ou ld be as far away as
possible from sou rces of electrical n oise (ign ition system s,
power cables, an d so on ).
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Th e an ten n a sh ou ld be vertical.
Th e an ten n a sh ou ld h ave an SWR of less th an 1.5:1. An
SWR of 1.8:1 or greater can preven t th e HTX-242 from per-
form in g to its specified ratin gs.
After you select an an ten n a, follow its m ou n tin g in stru ction s. Th en
rou te th e an ten n a cable from th e an ten n a to th e HTX-242 an d
con n ect it to th e an ten n a con n ector.
Con n ect th e an ten n a to you r HTX-242 u sin g 50-oh m coaxial cable.
Th e cable sh ou ld en d in a PL-239 con n ector.
Cautions:
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To prevent damage to your HTX-242, you must connect an
antenna to it before you operate it.
Do not run the cable over sharp edges or moving parts that might
damage the cable.
Do not run the cable through the engine compartment or other
areas that produce extreme heat.
Check with your vehicle manufacturer for antenna cable routing
guidelines.
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Conne c ting to your Ve hic le ’s Powe r
Follow th ese steps to power th e HTX-242 in you r veh icle.
1. Con n ect th e black wire to you r veh icle battery’s n egative (–)
term in al or to a m etal part of th e veh icle’s fram e. Be su re th e
m etal part is n ot in su lated from th e veh icle’s fram e by a
plastic part.
2. Con n ect th e red wire to a sou rce of voltage th at tu rn s on an d
off with th e ign ition an d th at can h an dle th e tran sceiver’s
10-am p m axim u m power draw.
Or, if you do n ot wan t th e HTX-242 to tu rn on an d off with
you r veh icle’s ign ition , con n ect th e red wire directly to th e
battery’s positive (+) term in al.
Note: You might need to connect the red wire directly to the battery if you
experience ignition noise.
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Using the HTX-242 a s a Ba se Sta tion
Alth ou gh we design ed th e HTX-242 prim arily for u se as a m obile
tran sceiver, you can also u se it as a base station . To do so, you
n eed th ese item s:
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13.8-Volt DC regu lated power su pply th at can su pply at
least 10 am ps con tin u ou s power
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•
Base station an ten n a
50-oh m coaxial an ten n a cable an d con n ectors
Follow th ese steps to con n ect th e HTX-242 as a base station .
1. Mou n t th e base station an ten n a accordin g to its in stru c-
tion s.
Warning: For your safety, follow all cautions and warnings included with
the base station antenna.
2. Con n ect th e an ten n a cable to th e an ten n a jack on th e back
of th e HTX-242.
3. Con n ect th e black power wire to th e power su pply’s n egative
(–) term in al.
4. Con n ect th e red power wire to th e power su pply’s positive (+)
term in al.
5. Con n ect th e power su pply to a sou rce of power.
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Using the HTX-242 with Pa c ke t Ra d io
You can con n ect you r HTX-242 directly to a packet radio term in al
n ode con troller, as sh own below.
Not e: You can pu rch ase an 8-pin plu g th at m atch es you r HTX-
242’s MIC jack at you r local Radio Sh ack store (Cat. No. 279-440).
Conne c ting a n Exte rna l Sp e a ke r (Op tiona l)
You can con n ect an extern al speaker to you r HTX-242.
Use an 8-oh m com m u n ication s or PA speaker th at can h an dle 5 or
m ore watts of power (su ch as Radio Sh ack Cat. No. 21-549). Th e
speaker’s cable m u st en d in a 1/ 8-in ch plu g. Sim ply plu g th e
speaker cable in to th e HTX-242’s EXT. SP jack.
If you r veh icle h as a cassette player, you can easily con n ect you r
tran sceiver to you r veh icle’s au dio system u sin g a CD-to-cassette
adapter an d a m on o-to-stereo au dio plu g.
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UNDERSTANDING THE HTX-242
Th is section explain s som e of th e HTX-242’s featu res. See “Basic
Operation ” on Page 16 for in stru ction s abou t h ow to u se th ese fea-
tu res.
Dua l VFO Mod e s
Th e VFO (Variable-Frequ en cy Oscillator) m odes let you directly
select a frequ en cy an ywh ere with in th e HTX-242’s operatin g ran ge.
You r HTX-242 h as two VFOs: VFO-A an d VFO-B. You typically u se
th e VFOs to tu n e to frequ en cies you h ave n ot stored in to on e of th e
HTX-242’s m em ory ch an n els (see “Mem ory Ch an n els” on Page 13).
A related featu re of th e HTX-242 lets you tran sm it on th e fre-
qu en cy selected with on e VFO an d receive on th e frequ en cy
selected with th e oth er VFO. (See “Usin g th e Du al VFOs for Du plex
Operation ” on Page 27.)
DTMF (Touc h-Tone ) Fe a ture s
DTMF (Du al-Ton e, Mu ltiple Frequ en cy) is an oth er term for touch-
tones (th e ton es a teleph on e produ ces wh en you press a digit). Th is
stan dard set of ton es is u sed by m an y differen t am ateu r radio sys-
tem s for accessin g program m able featu res an d dialin g th rou gh
au topatch es.
You r HTX-242 produ ces all 16 stan dard DTMF ton es (0-9, ✱, #, A,
B, C, an d D). It h as 10 DTMF m em ories wh ich can each h old u p to
15 digits for qu ick tran sm ission . You can also set th e HTX-242 to
listen for a specific set of DTMF ton es, an d alert you wh en it
detects th em (th is featu re is called DTMF Pa ging). Un til it h ears th e
sequ en ce, th e HTX-242 does n ot pass an y tran sm ission s to th e
speaker.
Grou p Callin g lets you DTMF page a sin gle person or an en tire
grou p of people. To u se grou p callin g, every person in th e grou p
selects th e sam e first th ree digits as th eir DTMF page sequ en ce.
Th ey th en select u p to fou r addition al digits u n iqu e to each person .
To page an in dividu al, you tran sm it th eir en tire DTMF page
sequ en ce. To page th e en tire grou p, you tran sm it at least th e first
th ree digits of th e sequ en ce, followed by th e DTMF ton es for A, B,
an d C.
Note: Group Calling only works with the HTX-242 and other transceivers
that support this feature.
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Sub a ud ib le Tone (CTCSS) Fe a ture s
Su bau dible ton es, also kn own as CTCSS (Con tin u ou s Ton e-Coded
Squ elch System ) are low-frequ en cy ton es th at are m ixed with a
tran sm ission . Th ey are u sed by m an y repeaters to lim it in terfer-
en ce from oth er n earby radio tran sm itters. Wh en a repeater u ses a
su bau dible ton e, it does n ot react to an y tran sm ission th at does
n ot in clu de th at ton e.
You r HTX-242 in clu des all 38 stan dard su bau dible ton es. You can
set you r HTX-242 to in clu de an y of th ese ton es with you r tran s-
m ission s. You can also set you r HTX-242 to lim it reception to on ly
th ose tran sm ission s th at in clu de th e selected ton e.
Re p e a te r Op e ra tion
Operation th rou gh a repeater, wh ere you tran sm it on on e fre-
qu en cy an d receive on an oth er, is called duplex operation . Opera-
tion direct to an oth er station wh ere you tran sm it an d receive on
th e sam e frequ en cy is called s implex operation .
A repeater is a station th at receives sign als on on e frequ en cy (th e
input frequ en cy) an d th en retran sm its th em on a differen t fre-
qu en cy (th e output frequ en cy). Repeater an ten n as are typically at
th e tops of tall bu ildin gs or on an ten n a towers, so a relatively low-
power sign al can reach th e repeater. Th e repeater retran sm its th e
sign al at a h igh er power. Th is gives u sers of low-power tran sceivers
th e ability to com m u n icate over a m u ch greater ran ge.
To u se a repeater, you m u st kn ow th e repeater’s in pu t an d ou tpu t
frequ en cies. Repeaters are u su ally iden tified by th eir ou tpu t fre-
qu en cy. Th u s, a repeater th at h as an ou tpu t frequ en cy of 146.94 is
referred to as th e 146.94 repeater. To determ in e th e in pu t fre-
qu en cy you m u st kn ow th e frequ en cy offs et (600 kHz for m ost of
th e 2-m eter ban d) an d th e offset direction (+ if you add 600 kHz to
th e ou tpu t, or – if you su btract 600 kHz from th e ou tpu t).
You r HTX-242 is program m ed with th e defau lt 600 kHz frequ en cy
offset an d direction for th e 2-m eter ban d. See “Frequ en cy Offset
Defau lts” on Page 25. Wh en you tu n e to a frequ en cy th at is n or-
m ally assign ed for repeater u se, th e HTX-242 au tom atically selects
th e correct in pu t frequ en cy if you tu rn ed on th e AS option .
Me m ory Cha nne ls
You r HTX-242 h as 41 m em ory ch an n els (40 stan dard m em ory
ch an n els an d on e callin g-frequ en cy m em ory ch an n el). Each m em -
ory ch an n el can h old a tran sm it an d receive frequ en cy, su bau dible
tran sm it an d receive ton es, th e tran sm it power level, an d wh eth er
su bau dible ton e tran sm it an d squ elch are on or off. Th e HTX-242
can even scan a selected ran ge an d au tom atically store active fre-
qu en cies in u n u sed m em ory location s.
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Und e rsta nd ing the Disp la y
On e or m ore of th e followin g in dicators appear wh en you tu rn on
an d u se you r HTX-242.
VFO-Aor VFO-B— appears wh en you select on e of th e VFO
m odes. See “Du al VFO Modes” on Page 12.
VFO-A-T
VFO-B
— appears wh en you select th e DUP-A m ode (tran sm it
on VFO-A an d receive on VFO-B). See “Usin g th e Du al VFOs for
Du plex Operation ” on Page 27.
VFO-A
VFO-B-T— appears wh en you select th e DUP-B m ode (receive on
VFO-A an d tran sm it on VFO-B). See “Usin g th e Du al VFOs for
Du plex Operation ” on Page 27.
BUSY— appears wh en th e HTX-242 is receivin g a tran sm ission .
See “Receivin g Tran sm ission s” on Page 22.
FUNC— appears after you press F. Flash es after you h old F for at
least 1 secon d.
LOCK— appears wh en you lock th e HTX-242’s fu n ction s. See
“Lockin g th e Con trols” on Page 17.
T— appears wh en tran sm it su bau dible ton e is tu rn ed on . See
“Usin g Su bau dible Ton es” on Page 36.
T-SQL— appears wh en both tran sm it su bau dible ton e an d su b-
au dible ton e squ elch are tu rn ed on . See “Usin g Su bau dible Ton es”
on Page 36.
ALT— appears wh en you tu rn on th e DTMF page/ su bau dible ton e
alert. See “Settin g th e DTMF Page an d Su bau dible Ton e Alert” on
Page 37.
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+ or –— in dicates th e du plex offset direction . See “Overridin g th e
Du plex Offset” on Page 26.
DTMF— appears wh en you tu rn on DTMF squ elch . See “Usin g
DTMF Page” on Page 33.
HIGHor LOW— in dicates th e tran sm it power level. See “Settin g th e
Power Level” on Page 17.
ON-AIR— appears wh en you tran sm it. See “Tran sm ittin g” on
Page 22.
— appears wh en you tu rn on th e Ch an n el 1 alarm . Flash es
wh en th ere is a tran sm ission on Mem ory Ch an n el 1 an d th e alarm
is tu rn ed on . See “Ch eckin g Priority Ch an n el 1” on Page 30.
M-CH— appears wh en you tu n e to a m em ory ch an n el. See “Mem -
ory Ch an n els” on Page 13.
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BASIC OPERATION
Turning On/ Off Your HTX-242
To tu rn you r HTX-242 on or off, press POWER. Wh en you tu rn it
on , all display elem en ts briefly tu rn on an d th e HTX-242 sou n ds
five ton es. Th en it retu rn s to th e last-u sed settin gs.
Re se tting the HTX-242
Wh en you first u se you r HTX-242, if it displays PLL Error EEP
Err, or if you ever wan t to reset th e HTX-242 to th e factory
defau lts an d clear all m em ory, follow th ese steps.
Important: This procedure clears all stored information.
1. Tu rn off th e HTX-242.
2. Wh ile h oldin g down F+T-SQL, tu rn on th e HTX-242.
All display elem en ts stay on for abou t 1 secon d.
See “Exten din g th e Tran sm it Frequ en cy Ran ge” (below) an d “Usin g
th e Men u ” on Page 38.
Exte nd ing the Tra nsm it Fre q ue nc y Ra ng e
Th e followin g are th e HTX-242’s defau lt frequ en cy ran ges:
Tran sm it: 144.000 – 148.000 MHz
Receive: 136.000 – 174.000 MHz
Important: Do not expand the transmit frequency coverage unless you
are licensed to operate on MARS or CAP frequencies.
To expan d th e tran sm it frequ en cy coverage, h old down F+DTMF
wh ile you tu rn on th e HTX-242. Th e n ew frequ en cy ran ges are:
Tran sm it: 142.500 – 149.500 MHz
Receive:
136.000 – 174.000 MHz
Note: To return to the default frequency ranges, you must reset the trans-
ceiver. See “Resetting the HTX-242”.
16
Se tting Volum e a nd Sq ue lc h
SQUELCH sets th e m in im u m sign al level th at m u st be presen t for
th e HTX-242 to am plify th e sign al th rou gh th e speaker or to stop
wh en scan n in g. Follow th ese steps to set th e squ elch .
1. Rotate SQUELCH fu lly cou n terclockwise.
2. Set VOLUME so you can h ear th e backgrou n d h iss between
tran sm ission s.
Not e: If you do n ot h ear h issin g, tu rn TUNE/M-CH to select a
frequ en cy th at does n ot h ave com m u n ication s in progress.
3. Slowly tu rn SQUELCH clockwise u n til th e h issin g stops.
If you tu rn SQUELCH too far clockwise, you m igh t m iss parts of
tran sm ission s. If you do n ot tu rn SQUELCH far en ou gh clockwise,
you h ear h issin g between tran sm ission s an d th e HTX-242 m igh t
n ot scan properly.
Using the Lig ht
You r HTX-242 h as two display ligh t levels. To switch between th e
two levels, press F th en DIM.
Se tting the Powe r Le ve l
You r HTX-242 h as two tran sm it power levels. Low is abou t 10
watts, an d h igh is abou t 45 watts. To switch between th e two
power levels, press LOW. LOWor HIGHappears on th e display. Th e
power settin g is saved wh en you store settin gs in m em ory.
Loc king the Controls
To lock th e con trols on th e m icroph on e (except th e pu sh -to-talk
bu tton , PTT), slide LOCK ON to th e righ t. Th is does n ot lock th e
HTX-242’s fron t pan el con trols.
To lock all con trols except POWER, VOLUME, SQUELCH, an d th e
pu sh -to-talk bu tton , press F th en LOCK. LOCK appears on th e dis-
play.
To u n lock th e con trols, press F th en LOCK again .
17
Se le c ting a Fre q ue nc y
You can select a frequ en cy in an y of th ree ways:
Direct en try
Tu n in g
Scan n in g
•
•
•
Dire c tly Ente ring a Fre q ue nc y
1. Press VFO to select eith er VFO-Aor VFO-B.
2. En ter th e last five digits of th e frequ en cy. For exam ple, to
en ter 145.050, sim ply press 45050.
Notes:
•
•
•
The HTX-242 rounds the last digit down to 5 or 0.
The HTX-242 does not accept entries outside its range.
If you have turned on the AS option, the HTX-242 automatically
selects the correct duplex offset for frequencies normally assigned
to repeaters and selects no offset for other frequencies. See “Turn-
ing Auto Duplex On and Off” on Page 25.
Tuning to a Fre q ue nc y
1. Press VFO to select eith er VFO-Aor VFO-B.
2. Rotate TUNE, or press UP or DOWN on th e m icroph on e, to step
th rou gh th e frequ en cies.
Notes:
•
You can set the HTX-242 to step in 5, 10, 12.5, 20, 25, 50, or 100
kHz increments. The default is 20 kHz. See “Setting the Frequency
Step” on Page 19.
•
•
To step in 1 MHz increments, press MHz. Press MHz again to
return to the previous frequency step.
If you have turned on the AS option, the HTX-242 automatically
selects the correct duplex offset for frequencies normally assigned
to repeaters and selects no offset for other frequencies. See “Turn-
ing Auto Duplex On and Off” on Page 25.
18
Sc a nning for a Fre q ue nc y
1. Press VFO to select eith er VFO-Aor VFO-B.
2. Press F. Th en press ▲ to scan u p or ▼ to scan down .
Notes:
•
You can set the HTX-242 to scan in 5, 10, 12.5, 20, 25, 50, or 100
kHz steps. The default is 20 kHz. See “Setting the Frequency
Step” on Page 19.
•
•
You can program up to five frequencies for the HTX-242 to skip
when scanning. See “Storing Scan Skip Frequencies” on Page 20.
When the HTX-242 reaches one end of the scanning range, it
starts over at the other end. To set the scanning range, see “Set-
ting the Scanning Range” on Page 21.
•
•
When the HTX-242 stops on a transmission, it either stops scan-
ning, resumes scanning in 10 seconds even if the transmission
continues, or stays on the frequency until the transmission ends.
To select the scan resume option, see “Setting the Scan Resume
Condition” on Page 20.
If you set the HTX-242 to resume scanning after the transmission
ends, it pauses to ensure you do not miss a reply. To set the scan
delay, see “Setting the Scan Resume Delay” on Page 21.
•
•
If you press PTT on the microphone, scanning stops.
To resume scanning after the HTX-242 stops, press MHZ.
Se tting the Fre q ue nc y Ste p
Th e factory defau lt frequ en cy step is 20 kHz. Each tim e you rotate
TUNE on e click, or press UP or DOWN on th e m icroph on e, th e fre-
qu en cy ch an ges by 20 kHz. Wh en scan n in g, th e HTX-242 scan s u p
or down 20 kHz per step.
Follow th ese steps to ch an ge th e frequ en cy step.
1. Press VFO.
2. Press F th en STEP. Th e HTX-242 displays Stan d th e cu rren t
frequ en cy step.
3. Rotate TUNE, or press UP or DOWN on th e m icroph on e, to
select th e desired frequ en cy step (5, 10, 12.5, 20, 25, 50, or
100 kHz).
4. Press MHz or PTT to save th e settin g.
19
Se tting the Sc a n Op tions
Storing Sc a n Skip Fre q ue nc ie s
You can store u p to five frequ en cies for you r HTX-242 to skip wh en
scan n in g. Th is lets you preven t th e HTX-242 from stoppin g on
beacon or packet repeater frequ en cies.
1. Press VFO.
2. Hold F for at least 1 secon d. FUNCflash es.
3. Press MR. Th e HTX-242 displays SCan d th e cu rren t scan
resu m e settin g.
4. Repeatedly press ▲ u n til th e HTX-242 displays S1an d th e
first scan skip frequ en cy (or –––.––– if n o frequ en cy is
stored).
5. Select th e first scan skip frequ en cy by rotatin g TUNE, press-
in g UP or DOWN on th e m icroph on e, or directly en terin g th e
last five digits of th e frequ en cy.
6. Press ▲ for th e n ext scan skip m em ory—S2, S3, S4, or S5.
7. Repeat Steps 5 an d 6 for each scan skip frequ en cy.
8. Press MR or PTT to save th e settin g.
Se tting the Sc a n Re sum e Cond ition
Wh en you scan VFO frequ en cies or frequ en cies you stored in m em -
ory, th e HTX-242 stops at an y sign al stron g en ou gh to break
squ elch . Th e HTX-242 is preset to ti, m ean in g it resu m es scan -
n in g in 10 secon ds, even if th e sign al con tin u es.
Follow th ese steps to ch an ge th e scan resu m e con dition .
1. Press VFO.
2. Hold F for at least 1 secon d. FUNCflash es.
3. Press MR. Th e HTX-242 displays SCan d th e cu rren t option .
ti
cr
Resu m es scan n in g in 10 secon ds
Resu m es scan n in g after th e carrier drops an d th e
scan resu m e delay expires
SE
Does n ot resu m e scan n in g
4. Rotate TUNE, or press UP or DOWN on th e m icroph on e, to
select th e desired option .
5. Press MR or PTT to save th e settin g.
20
Se tting the Sc a n Re sum e De la y
Wh en you set th e scan resu m e con dition to cr(carrier), th e HTX-
242 resu m es scan n in g after th e carrier drops. Th e scan resu m e
delay option lets you set th e HTX-242 to pau se before resu m in g so
you can h ear replies. Th e factory defau lt is 2 secon ds.
Follow th ese steps to ch an ge th e scan resu m e delay.
1. Press VFO.
2. Hold F for at least 1 secon d. FUNCflash es.
3. Press MR.
4. Repeatedly press ▲ u n til th e HTX-242 displays Sdan d th e
cu rren t scan resu m e delay (0.5, 1, 2, or 4 secon ds).
5. Rotate TUNE, or press UP or DOWN on th e m icroph on e, to
select th e desired scan resu m e delay.
6. Press MR or PTT to save th e settin g.
Se tting the Sc a nning Ra ng e
Wh en you scan in a VFO m ode, th e HTX-242 scan s frequ en cies
with in a selected ran ge. Th e defau lt ran ge is 144.0 to 148.0 MHz.
Follow th ese steps to ch an ge th e scan n in g ran ge.
1. Press VFO.
2. Hold F for at least 1 secon d. FUNCflash es.
3. Press MR.
4. Repeatedly press ▲ u n til th e HTX-242 displays SLan d th e
lower scan lim it.
5. Rotate TUNE, press UP or DOWN on th e m icroph on e, or
directly en ter th e lower scan lim it’s last five digits on th e
m icroph on e’s keypad.
6. Press ▲. Th e HTX-242 displays SHan d th e u pper scan lim it.
7. Rotate TUNE, press UP or DOWN on th e m icroph on e, or
directly en ter th e u pper scan lim it’s last five digits on th e
m icroph on e’s keypad.
8. Press MR or PTT to save th e settin gs.
Note: The frequency gap between the lower and upper scan limits should
be no less than two times the current frequency step. If the frequency gap
is less than this, the HTX-242 does not scan.
21
Re c e iving Tra nsm issions
To receive a tran sm ission , tu rn on th e HTX-242, adju st th e volu m e
an d squ elch , an d tu n e to th e frequ en cy you wan t to m on itor. Th e
HTX-242 displays BUSY, an d th e sign al-stren gth in dicator sh ows
th e relative sign al stren gth wh en it receives a sign al.
Not e: If BUSYappears bu t you h ear n oth in g from th e speaker, be
su re th e DTMF page an d ton e-squ elch featu res are tu rn ed off an d
SQUELCH is set correctly. To tu rn off DTMF page, press DTMF on ce.
To tu rn off ton e squ elch , press T-SQL u n til n eith er Tn or T-SQL
appears on th e display. See “Activatin g Su bau dible Ton e Tran sm it
an d Squ elch ” on Page 37.
Tra nsm itting
Caution: It is illegal to transmit if you do not have a Technician Class (or
higher) license issued by the FCC.
1. Select th e desired frequ en cy.
Not e: If you select a repeater frequ en cy, th e HTX-242 dis-
plays +or –to sh ow th e offset direction . To operate with n o
offset (sim plex) on th at frequ en cy, press SHIFT u n til n eith er +
n or –appears.
2. Press LOW so LOWappears on th e display. Th is selects th e
low power (10 watt) settin g.
3. Press th e pu sh -to-talk bu tton (PTT) on th e side of th e m icro-
ph on e to tran sm it. Th e sign al stren gth m eter sh ows h alf-
scale for low power (or fu ll-scale for h igh power). Release PTT
to listen for a reply.
Notes:
•
If the other party advises you to improve your signal, press LOW.
HIGHappears on the display, and the HTX-242 transmits at high
power (about 45 watts). To return to low power, press LOW again.
•
If you try to transmit outside the permitted range, the HTX-242 dis-
plays tF Errand beeps twice.
22
Ma nua lly Tra nsm itting DTMF Tone s
To tran sm it DTMF ton es, follow th e steps for tran sm ittin g. Th en ,
wh ile h oldin g down PTT, press th e digits on th e m icroph on e to
tran sm it th e ton es.
Note: If auto-reply is turned on, you must hold down PTT while you trans-
mit. If auto-reply is off, you can release PTT after you enter the first digit.
The HTX-242 transmits for 1 second after you enter the last digit. See
“Using Auto-Reply” on Page 34.
Tra nsm itting DTMF Tone s from Me m ory
1. Press DTMF so th e HTX-242 displays DTMFan d th e cu rren t
DTMF m em ory n u m ber.
2. To select a differen t DTMF m em ory, press an d h old F for at
least 1 secon d. Th en press DTMF.
3. Rotate TUNE or press ▲ or ▼ to select th e desired DTMF
m em ory.
4. Press an d h old PTT. Th en press DTMF to sen d th e cu rren t
DTMF m em ory.
Notes:
•
If you turn on the DTMF auto send option and turn on DTMF mem-
ory (DTMFappears on the display), the HTX-242 sends the DTMF
sequence in the current memory every time you press PTT. See
“Using DTMF Auto Send” on Page 35.
•
To store DTMF sequences, see “Storing a DTMF Sequence” on
Page 32.
23
Lim iting Tra nsm it Dura tion
Wh en you com m u n icate on th e 2-m eter ban d, you sh ou ld keep
you r tran sm ission s as brief as possible. Most repeaters h ave bu ilt-
in tim ers th at lim it sin gle tran sm ission s to 3 m in u tes or less.
You can set th e tran sceiver to stop tran sm ittin g an d sou n d a beep
if a sin gle tran sm ission exceeds th e selected tim e (n on e, 1, 2, 3, 5,
7, 10, or 15 m in u tes). Follow th ese steps to select th e tran sm ission
tim e-ou t settin g.
1. Press VFO.
2. Hold F for at least 1 secon d. FUNCflash es.
3. Press MR.
4. Repeatedly press ▲ u n til th e HTX-242 displays toan d
eith er th e selected tim e (if th e option is on ) or oFF(if th e
option is off).
5. Rotate TUNE, or press UP or DOWN on th e m icroph on e, to
select th e desired tim e-ou t tim e (to tu rn on th e tim e ou t
option ) or oFF(to tu rn off th e option ).
6. Press MR or PTT to save th e settin gs.
Turning the Ke ytone Be e p On a nd Off
You r HTX-242 sou n ds a beep each tim e you press a bu tton . Follow
th ese steps to tu rn off th is keyton e beep.
Note: This does not affect the tone-alert beep, alarm scan beep, or the
transmit limit beep.
1. Press VFO.
2. Hold F for at least 1 secon d. FUNCflash es.
3. Press MR.
4. Repeatedly press ▲ u n til th e HTX-242 displays bpan d
eith er on(if th e beep option is on ) or oFF(if th e option is off).
5. Rotate TUNE, or press UP or DOWN on th e m icroph on e, to
select on(to tu rn on th e beep option ) or oFF(to tu rn off th e
option ).
6. Press MR or PTT to save th e settin gs.
24
ADVANCED OPERATION
Fre q ue nc y Offse t De fa ults
Wh en you select a frequ en cy, th e HTX-242 defau lts to th e followin g
frequ en cy offsets if au to du plex is tu rn ed on :
Receive Frequ en cy
Tran sm it Offset
Below 144.600 MHz
No offset (Sim plex)
+ offset
144.600 to 144.905 MHz
144.910 to 145.205 MHz
145.210 to 145.505 MHz
145.510 to 146.005 MHz
146.010 to 146.375 MHz
146.380 to 146.605 MHz
146.610 to 146.995 MHz
147.000 to 147.395 MHz
147.400 to 147.595 MHz
147.600 to 147.995 MHz
148.000 MHz an d above
No offset (Sim plex)
– offset
No offset (Sim plex)
+ offset
No offset (Sim plex)
– offset
+ offset
No offset (Sim plex)
– offset
No offset (Sim plex)
Th e defau lt offset is 600 kHz. For exam ple, if you tu n e to receive
146.940 MHz, th e HTX-242 au tom atically tran sm its at 146.340
MHz (600 kHz less th an 146.940).
Note: Outside these ranges, the HTX-242 operates with no offset.
Turning Auto Dup le x On a nd Off
Th e HTX-242 can au tom atically select th e correct du plex offset for
frequ en cies n orm ally assign ed to repeaters an d selects n o offset
(sim plex) for oth er frequ en cies. Follow th ese steps to tu rn th is
option on or off.
1. Press VFO.
2. Hold F for at least 1 secon d. FUNCflash es.
3. Press MR.
4. Repeatedly press ▲ or ▼ u n til th e HTX-242 displays ASan d
eith er on(if th e option is on ) or oFF(if th e option is off).
5. Rotate TUNE, or press UP or DOWN on th e m icroph on e, to
select onor oFF.
6. Press MR or PTT to save th e settin g.
25
Cha ng ing the De fa ult Offse t
Follow th ese steps to ch an ge th e defau lt offset for th e VFO m odes.
1. Press VFO.
2. Hold F for at least 1 secon d. FUNCflash es.
3. Press SHIFT. Th e HTX-242 displays oSan d th e cu rren t offset
(in MHz).
4. Rotate TUNE, press UP or DOWN on th e m icroph on e, or
directly en ter th e step u sin g th e m icroph on e’s keypad to
select an offset defau lt (from 0 to 38 MHz).
5. Press SHIFT or PTT to save th e settin g.
Note: This setting does not affect frequencies already stored in memory.
Re ve rsing the Offse t
To reverse th e tran sm it an d receive frequ en cies wh en you operate
du plex, press F th en REV. For exam ple, if you tu n e to 146.940
(wh ich h as a – offset), pressin g F th en REV m akes th e tran sceiver
receive on 146.340 an d tran sm it on 146.940. Th e settin g retu rn s
to th e defau lt if you ch an ge frequ en cies.
Ove rrid ing the Dup le x Offse t
Wh en you tu n e to a frequ en cy, th e HTX-242 au tom atically selects
eith er sim plex operation , or du plex operation with th e correct off-
set direction (if th e au to du plex option is on ). To override th is set-
tin g, press SHIFT. Each tim e you press SHIFT, th e offset switch es
between +, –, an d n o offset. Th e settin g retu rn s to th e defau lt if you
ch an ge frequ en cies.
26
Using the Dua l VFOs for Dup le x Op e ra tion
Follow th ese steps to u se on e VFO to tran sm it an d th e oth er to
receive.
1. Press VFO to select VFO-A.
2. Select a frequ en cy.
3. Press VFO to select VFO-B.
4. Select a frequ en cy.
5. Press DUP.
Wh en th e HTX-242 displays:
VFO-A-T
VFO-B
it tran sm its on th e VFO-A frequ en cy an d receives on th e
VFO-B frequ en cy.
Wh en it displays:
VFO-A
VFO-B-T
it tran sm its on th e VFO-B frequ en cy an d receives on th e
VFO-A frequ en cy.
27
USING MEMORY CHANNELS
Th e HTX-242 h as 40 stan dard m em ory ch an n els an d on e callin g-
frequ en cy m em ory, wh ere you can store frequ en tly-u sed frequ en -
cies, alon g with all settin gs, for qu ick access.
Storing a Fre q ue nc y
1. Press VFO an d tu n e to a frequ en cy you wan t to store. Set all
du plex an d su bau dible ton e settin gs (see “Usin g Su bau dible
Ton es” on Page 36), th e tran sm it power settin g, an d th e
DTMF option .
2. To st ore t h e frequ en cy in t h e callin g-frequ en cy m em ory,
press an d h old F for at least 1 secon d. FUNCflash es on th e
display. Th en press CALL.
To st ore t h e frequ en cy in a st an dard m em ory, press F.
Rotate TUNE, or press UP or DOWN on th e m icroph on e, u n til
th e HTX-242 displays th e desired m em ory n u m ber to th e left
of th e frequ en cy. Th en press MR. Th e HTX-242 beeps twice
an d stores all settin gs in to th e selected m em ory ch an n el.
Cha ng ing Store d Se tting s
To ch an ge th e receive frequ en cy, follow th e steps u n der “Storin g a
Frequ en cy.” To ch an ge th e tran sm it frequ en cy or a ton e squ elch
option with ou t ch an gin g th e receive frequ en cy, follow th ese steps.
1. To ch an ge th e callin g m em ory, press CALL.
To ch an ge a stan dard m em ory, press MR. Th en rotate TUNE,
or press UP or DOWN on th e m icroph on e, to select th e m em -
ory ch an n el you wan t to ch an ge.
2. If you wan t to tu rn ton e squ elch on or off, repeatedly press T-
SQL to select th e desired ton e squ elch m ode. (See “Usin g
Su bau dible Ton es” on Page 36.)
3. For t h e callin g-frequ en cy m em ory, press an d h old F for
on e secon d. Th en press CALL.
For a st an dard m em ory, press F, th en press MR.
Th e HTX-242 displays rFan d th e receive frequ en cy, an d M-
CHflash es.
4. Rotate TUNE, press UP or DOWN on th e m icroph on e, or en ter
th e receive frequ en cy u sin g th e m icroph on e’s keypad.
5. Press ▲. Th e HTX-242 displays tFan d th e tran sm it fre-
qu en cy.
6. Rotate TUNE, press UP or DOWN on th e m icroph on e, or en ter
th e tran sm it frequ en cy u sin g th e m icroph on e’s keypad.
28
7. Press ▲. Th e HTX-242 displays rCan d th e cu rren t receive
su bau dible ton e.
8. Rotate TUNE, or press UP or DOWN on th e m icroph on e, to
ch an ge th e receive su bau dible ton e.
9. Press ▲. Th e HTX-242 displays tCan d th e cu rren t tran sm it
su bau dible ton e.
10. Rotate TUNE, or press UP or DOWN on th e m icroph on e, to
ch an ge th e tran sm it su bau dible ton e.
11. For t h e callin g-frequ en cy m em ory, press CALL to save all
settin gs.
For a st an dard m em ory, press ▲. Th e HTX-242 displays
Sn. Rotate TUNE, or press UP or DOWN on th e m icroph on e, to
select wh eth er th e m em ory is in clu ded in a m em ory scan
(On) or locked ou t of a m em ory scan (Off). Th en press MR to
save all settin gs.
Using Auto Me m ory Store (AMS)
Follow th ese steps to h ave th e HTX-242 scan th rou gh a selected
ran ge an d store active frequ en cies in m em ory.
1. Set th e u pper an d lower scan lim its (see “Settin g th e Scan -
n in g Ran ge” on Page 21).
2. Set th e scan n in g step (see “Settin g th e Frequ en cy Step” on
Page 19).
3. Set th e squ elch (see “Settin g Volu m e an d Squ elch ” on
Page 17).
4. Hold F for at least 1 secon d. Th en press MHz.
Th e HTX-242 scan s between th e lower an d u pper scan lim -
its. Wh en it detects a tran sm ission , it ch ecks all m em ories to
see if th at frequ en cy is already stored. If th e frequ en cy is n ot
in a m em ory, th e HTX-242 stores th e frequ en cy in th e lowest
u n u sed m em ory, th en resu m es scan n in g. Th e HTX-242 con -
tin u es au to store u n til all m em ories are u sed.
5. To stop au to store before all m em ories are u sed, press VFO,
DUP, MR, CALL, or MHz.
Notes:
•
•
The HTX-242 turns off tone squelch during auto store.
Auto store does not work if all memories are used.
29
Tuning to a Sta nd a rd Me m ory Cha nne l
1. Press MR.
2. Rotate M-CH, or press UP or DOWN on th e m icroph on e, to
select th e desired m em ory ch an n el.
Using the Ca lling -Fre q ue nc y Me m ory
Press CALL. Th e HTX-242 recalls all settin gs saved in th e callin g-
frequ en cy m em ory.
Notes:
•
If you rotate TUNE, press UP or DOWN, or directly enter a fre-
quency, the HTX-242 returns to the last-used VFO.
•
To return to the mode selected before you used the calling-
frequency memory, press CALL again.
Che c king Priority Cha nne l 1
To h ave th e HTX-242 periodically “look back” at Mem ory Ch an n el
1 to ch eck for a tran sm ission , press F th en ALM. appears on th e
display. Th e HTX-242 looks back at Mem ory Ch an n el 1 every 4, 8,
12, or 16 secon ds. If th ere is a tran sm ission , th e HTX-242 beeps to
let you kn ow to tu n e to it, if desired.
Follow th ese steps to ch an ge th e look-back tim e.
1. Press VFO.
2. Hold F for at least 1 secon d. FUNCflash es. Th en press MR.
3. Repeatedly press ▲ u n til th e HTX-242 displays Lban d th e
cu rren t look-back tim e.
4. Rotate TUNE, or press UP or DOWN on th e m icroph on e, to
select th e desired look-back tim e (4, 8, 12, or 16 secon ds).
5. Press MR or PTT to save th e settin g.
30
Sc a nning Me m ory Cha nne ls
To set th e HTX-242 to scan m em ory ch an n els, press an d release
MR. Th en press an d h old MR for at least 1 secon d. .flash es, an d
th e HTX-242 scan s m em ories th at h ave th e scan option tu rn ed on
(see “En ablin g/ Disablin g Scan n in g for Mem ory Ch an n els” on th is
page). Th e HTX-242 stops wh en it en cou n ters a tran sm ission . It
resu m es scan n in g accordin g to th e saved scan settin gs (see “Set-
tin g th e Scan Option s” on Page 20). To resu m e scan n in g im m edi-
ately, press MHz.
Note: Scanning stops if you press MR or PTT.
Cle a ring a Me m ory Cha nne l
You can clear an y m em ory ch an n el except Mem ory Ch an n el 1 an d
th e callin g-frequ en cy m em ory.
1. Tu n e to th e m em ory ch an n el you wan t to clear.
2. Hold F for at least 1 secon d. FUNCflash es.
3. Press MR. All settin gs are cleared from th e m em ory ch an n el.
Ena b ling / Disa b ling Sc a nning for Me m ory Cha nne ls
You can disable (lock ou t) in dividu al m em ory ch an n els, so th e
HTX-242 does n ot stop on th em wh en you scan m em ory ch an n els.
1. Tu n e to th e m em ory ch an n el you wan t to en able or disable
for scan n in g.
2. Press F, th en press MR.
3. Repeatedly press ▲ u n til th e HTX-242 displays Snan d th e
scan settin g.
4. To en able scan n in g for th e cu rren t ch an n el, rotate TUNE, or
press UP or DOWN on th e m icroph on e, to select on.
To disable scan n in g for th e cu rren t ch an n el, rotate TUNE, or
press UP or DOWN on th e m icroph on e, to select oFF.
5. Press MR or PTT to save th e settin g.
31
USING DTMF AND SUBAUDIBLE TONES
You r HTX-242 h as 10 DTMF (Du al-Ton e, Mu ltiple Frequ en cy—
an oth er n am e for touch tones ) m em ories wh ere you can store
DTMF sequ en ces. DTMF Mem ory 0 can h old a 7-digit DTMF pagin g
sequ en ce you r HTX-242 m u st receive for DTMF pagin g. DTMF
Mem ories 1-10 each h old 15 digits you can qu ickly tran sm it.
Storing a DTMF Se q ue nc e
1. Hold down F for at least 1 secon d. FUNCflash es.
2. Press DTMF. Th e HTX-242 displays th e sequ en ce stored in
th e cu rren tly selected m em ory.
3. Rotate TUNE, or press UP or DOWN on th e m icroph on e, to
select on e of th e 10 tran sm it DTMF m em ories (1–10) or th e
receive DTMF m em ory (0).
Not e: tdappears with tran sm it DTMF Mem ories 1-10, an d
rdappears with receive DTMF Mem ory 0.
4. Press SHIFT. Th en u se th e keypad to en ter th e sequ en ce you
wan t to store.
Not e: DTMF Mem ories 1–10 h old 15 digits each . DTMF
Mem ory 0 h olds 7 digits.
5. Repeat Steps 3 an d 4 to store m ore DTMF sequ en ces, or
press DTMF or PTT to save all sequ en ces an d retu rn to n or-
m al operation .
Note: To clear a DTMF sequence, repeat these steps but do not enter a
frequency in Step 4 after you press SHIFT.
Tra nsm itting a DTMF Se q ue nc e
1. Hold F for at least 1 secon d. FUNCflash es.
2. Rotate TUNE, or press UP or DOWN on th e m icroph on e, to
select th e DTMF m em ory th at con tain s th e sequ en ce you
wan t to tran sm it.
3. Press th e pu sh -to-talk bu tton . Wh ile h oldin g down PTT,
press DTMF. Th e HTX-242 tran sm its th e stored sequ en ce.
Note: If the DTMF auto send feature is turned on, the HTX-242 transmits
the tones in the selected DTMF memory every time you press PTT.
32
Using DTMF Pa g e
DTMF page lets oth er operators page you . To tu rn on DTMF page,
press DTMF so DTMFappears. Th e HTX-242 does n ot pass tran s-
m ission s to th e speaker u n til it receives th e sequ en ce you stored in
DTMF Mem ory 0. If DTMF Mem ory 0 is em pty, DTMF page does
n ot operate.
Wh en you receive a DTMF page, th e HTX-242 tu rn s on th e speaker
an d tu rn s off DTMF page so all tran sm ission s com e th rou gh .
Notes:
•
If you turn on auto-reply, the HTX-242 immediately sends the
sequence in the currently selected DTMF memory when it
receives the sequence you set. See “Using Auto-Reply” on
Page 34.
•
•
If you turn on tone-alert, the HTX-242 sounds four tones when it
receives its DTMF sequence you set. See “Setting the DTMF Page
and Subaudible Tone Alert” on Page 37.
If you turn on DTMF auto send, the HTX-242 opens squelch only
for transmissions that start with the sequence stored in DTMF
Memory 0. After the transmission, DTMF squelch is still turned on.
See “Using DTMF Auto Send” on Page 35.
Using Group Ca lling
Grou p callin g lets you page several u sers at on ce. Each u ser m u st
h ave a tran sceiver th at h as th is featu re. Wh en th e HTX-242
receives at least th ree DTMF ton es followed by th e sequ en ce A-B-C,
it com pares th e DTMF ton es it received before th e A-B-C with th e
sequ en ce in DTMF Mem ory 0. If th e ton es m atch , it operates as if it
received th e en tire sequ en ce.
For exam ple, if th ese sequ en ces are assign ed to a grou p:
Nam e
George
Bob
Dou g
Bill
Cary
Pau l
Kim
J am es
Beth
Assign m en t
West Side
West Side
East Side
North Side
East Side
Sou th Side
North Side
Sou th Side
East Side
DTMF Page Sequ en ce
4654321
4654254
4651823
4652252
4651855
4653552
4652183
4653122
4651931
33
•
Assu m in g all clu b m em bers h ave DTMF page activated, to
page everyon e, tran sm it 465ABC.
•
•
•
To page West Side m em bers, tran sm it 4654ABC.
To page Dou g an d Cary, tran sm it 46518ABC.
To page on ly on e person , tran sm it th e 7-digit sequ en ce.
Using Auto-Re p ly
If you tu rn on th e au to-reply featu re, th e HTX-242 au tom atically
sen ds th e sequ en ce stored in th e cu rren tly-selected DTMF m em ory
wh en it receives a DTMF page.
Follow th ese steps to tu rn on au to-reply.
1. Press VFO.
2. Hold F for at least 1 secon d. FUNCflash es.
3. Press MR. Th e HTX-242 displays th e first con figu ration m en u
item .
4. Repeatedly press ▲ to select th e Aroption . Th en rotate
TUNE, or press UP or DOWN on th e m icroph on e, to set th e
option to on.
5. Press MR or PTT to save th e settin g.
To tu rn off au to-reply, set th e option to oFFin Step 4.
34
Using DTMF Auto Se nd
If you tu rn on th e DTMF au to-sen d featu re, th e HTX-242 au tom at-
ically sen ds th e sequ en ce stored in th e cu rren tly-selected DTMF
m em ory every tim e you press PTT.
Follow th ese steps to tu rn on au to sen d.
1. Press VFO.
2. Hold F for at least 1 secon d. FUNCflash es.
3. Press MR.
4. Repeatedly press ▲ to select th e dAoption . Th en rotate
TUNE, or press UP or DOWN on th e m icroph on e, to set th e
option to on.
5. Press MR or PTT to save th e settin g.
6. Press DTMF so DTMFis on th e display.
To tem porarily tu rn off au to sen d, press DTMF so DTMFis n ot on
th e display. To tu rn off au to sen d, set th e option to oFFin Step 4.
Notes:
•
•
This feature works with the DTMF page feature. If you stored a
sequence in DTMF Memory 0, the HTX-242 does not pass trans-
missions to the speaker until it receives that sequence. After the
transmission, DTMF squelch is still turned on.
If there is no sequence stored in DTMF Memory 0, the HTX-242
still transmits the currently selected DTMF memory sequence
each time you press PTT, but passes all transmissions to the
speaker.
35
Using Sub a ud ib le Tone s
Som e repeaters requ ire you to tran sm it a su bau dible ton e to acti-
vate th em . You can set you r HTX-242 to tran sm it an y of th e 38
stan dard su bau dible ton es. You can also lim it in com in g reception
by settin g th e HTX-242 to open th e squ elch on ly wh en som eon e
tran sm its a su bau dible ton e you select.
Va lid Sub a ud ib le Tone s
Code
XZ
XA
WA
XB
WB
YZ
Freq. (Hz)
67.0
Code Freq. (Hz) Code
Freq. (Hz)
167.9
173.8
179.9
186.2
192.8
203.5
210.7
218.1
225.7
233.6
241.8
250.3
1B
2E
2A
2B
3Z
3A
3B
4Z
4A
4B
5Z
5A
5B
107.2
110.9
114.8
118.8
123.0
127.3
131.8
136.5
141.3
146.2
151.4
156.7
162.2
6Z
6A
6B
7Z
71.9
74.4
77.0
79.7
7A
M1
M2
M3
M4
M5
M6
M7
82.5
YA
85.4
YB
88.5
ZZ
91.5
ZA
ZB
94.8
97.4
1Z
100.0
103.5
1A
Se tting the Sub a ud ib le Tone s
Som e repeaters requ ire you to tran sm it a su bau dible ton e with
you r tran sm ission . You can also set a ton e th at m u st accom pan y
tran sm ission s for you r HTX-242 to open squ elch .
Follow th ese steps to set th e su bau dible ton es for th e VFO m ode.
After you set th e ton es, you m u st activate th e fu n ction to tu rn it
on . Ch an gin g th is settin g does n ot ch an ge th e ton es stored in an y
m em ory ch an n el.
1. Press VFO.
2. Hold F for at least 1 secon d. FUNCflash es.
3. Press T-SQL. Th e HTX-242 displays rCan d th e cu rren tly set
receive ton e.
4. Rotate TUNE, or press UP or DOWN on th e m icroph on e, to set
a differen t receive ton e. If you do n ot wan t a receive ton e,
select oFF.
36
5. Press ▲. Th e HTX-242 displays tCan d th e cu rren tly set
tran sm it ton e.
6. Rotate TUNE, or press UP or DOWN on th e m icroph on e, to set
a differen t tran sm it ton e. If you do n ot wan t a tran sm it ton e,
select oFF.
7. Press T-SQL or PTT to save th e settin gs.
Ac tiva ting Sub a ud ib le Tone Tra nsm it a nd Sq ue lc h
1. Press T-SQL on ce. Tappears. Th e HTX-242 in clu des th e
selected tran sm it ton e with you r tran sm ission s.
2. Press T-SQL again . T-SQLappears. Th e HTX-242 in clu des
th e selected tran sm it ton e with you r tran sm ission s an d
requ ires th e selected receive ton e to open squ elch .
3. Press T-SQL a th ird tim e to tu rn off both su bau dible ton e
tran sm it an d squ elch . Neith er Tn or T-SQLappears on th e
display.
Se tting the DTMF Pa g e a nd Sub a ud ib le Tone Ale rt
Wh en th e alert fu n ction is tu rn ed on , th e HTX-242 sou n ds a
sequ en ce of th ree ton es wh en it receives a DTMF page (if DTMF
page is activated) or a tran sm ission th at in clu des th e correct su b-
au dible ton e (if ton e squ elch is activated).
To tu rn on th e alert fu n ction , press F th en ALT. ALTappears. To
tu rn off th e alert fu n ction , press F th en ALT again . ALTdisappears.
37
USING THE MENU
You r HTX-242 h as a m en u th at lets you select h ow som e fu n ction s
work. Th e previou s section s in clu ded procedu res th at access th is
m en u —th is section provides an overview. Follow th ese steps to
u se th e m en u :
1. Press VFO.
2. Hold F for at least 1 secon d. FUNCflash es.
3. Press MR. Th e first m en u item appears. Th en press ▲ or ▼
to select th e desired m en u option .
4. Rotate TUNE, or press UP or DOWN on th e m icroph on e, to
select th e settin g. For option s th at requ ire a frequ en cy (su ch
as scan skip), you can u se th e m icroph on e keypad to directly
en ter th e frequ en cy’s last five digits.
5. Press MR or PTT to save th e settin gs.
38
Men u Defau lt
Explan at ion / Available Set t in gs
Page #
It em
Opt ion
Scan resu m e option .
20
SC
ti
ti—tim e ou t in 10 secon ds.
Cr—resu m e after carrier drops.
SE—do n ot resu m e scan n in g.
Scan delay (delay before resu m e wh en
SCis set to Cr). 0.5, 1, 2, or 4.
Scan skip frequ en cy 1 (frequ en cy for
HTX-242 to skip wh en scan n in g VFO).
21
20
Sd
2.0
S1 –––.–––
Scan skip frequ en cy 2.
Scan skip frequ en cy 3.
Scan skip frequ en cy 4.
Scan skip frequ en cy 5.
20
20
20
20
30
S2 –––.–––
S3 –––.–––
S4 –––.–––
S5 –––.–––
Look-back tim e (h ow often th e HTX-
242 ch ecks Priority Mem ory Ch an n el 1
for a tran sm ission wh en th e alarm is
activated). 4, 8, 12, or 16.
Lb
4
Lower scan lim it. With SH, determ in es
21
SL 144.000
SH 148.000
th e VFO scan n in g ran ge.
Upper scan lim it.
21
34
Au to reply (con trols wh eth er th e HTX-
242 tran sm its a DTMF m em ory
sequ en ce wh en it is DTMF paged). oFF
or on.
Ar
oFF
Tim e-ou t option (sets wh eth er th e
HTX-242 lim its tran sm ission s). oFF,
1, 2, 3, 5, 7, 10, or 15.
24
to
oFF
Keyton e beep option .
24
25
bp
AS
oN
on
Au to du plex/ sim plex option (con trols
wh eth er th e HTX-242 u ses th e stan -
dard repeater offsets). oFFor on.
DTMF au to sen d (con trols wh eth er th e
HTX-242 tran sm its th e con ten ts of th e
cu rren tly-selected DTMF m em ory each
tim e you press PTT). oFFor on.
35
dA
oFF
39
TROUBLESHOOTING
Error Cod e s
You r HTX-242 h as th e followin g th ree bu ilt-in error codes.
tF Err—appears if you try to tran sm it ou tside th e allowed ran ge
(see “Exten din g th e Tran sm it Frequ en cy Ran ge” on Page 16).
PLL Err—appears if th e HTX-242’s PLL (ph ase-locked loop) sec-
tion m alfu n ction s. If tu rn in g th e HTX-242 off th en back on does
n ot correct th is error, take it to you r local Radio Sh ack store to
arran ge for service.
EEP Err—appears if th e HTX-242’s EEPROM ch ecksu m fails. Try
resettin g th e HTX-242 (see “Resettin g th e HTX-242” on Page 16). If
th is does n ot clear th e error, take it to you r local Radio Sh ack store
to arran ge for service.
Com m on Prob le m s a nd Solutions
If you r HTX-242 does n ot seem to be operatin g properly, ch eck th is
section for a possible solu tion .
Problem
Possible Solu t ion s
Sign al stren gth m eter Be su re DTMFis n ot on th e display. If it is,
sh ows a sign al an d
BUSYappears, bu t n o
sou n d from speaker.
press DTMF to tu rn off DTMF page.
Be su re T-SQLis n ot on th e display. If it
is, press T-SQL u n til n eith er Tn or T-SQL
appears.
Be su re VOLUME an d SQUELCH are prop-
erly adju sted.
Be su re n oth in g is plu gged in to th e EXT.
SP jack.
No con trols operate.
Be su re LOCKis n ot on th e display. If it is,
press F th en LOCK to u n lock th e con trols.
Be su re LOCK on th e m icroph on e is set to
its leftm ost position .
Oth er party can n ot
h ear you r tran sm is-
sion .
Be su re th e du plex offset is set correctly.
Set th e ou tpu t power to h igh by pressin g
LOW so HIGHappears on th e display.
Th e display does n ot
ligh t wh en you press
POWER.
Ch eck th e power con n ection s.
Ch eck th e fu se (see “Replacin g th e Fu se”
on Page 41).
40
Re p la c ing the Fuse
You r HTX-242 (an d veh icle) are protected by a 15-am p fu se in th e
HTX-242’s positive (red) power wire. If th e HTX-242 does n ot tu rn
on , even wh en you are su re th e power wire is properly con n ected to
a 12V DC power sou rce, ch eck th e fu se an d replace it, if n ecessary.
1. Sn ap open th e in -lin e fu se h older.
2. Rem ove th e fu se from th e h older, an d slide th e fu se ou t of
th e en d con n ectors.
3. If th e fu se’s filam en t is n o lon ger in tact, replace th e fu se with
a 15-am p 1 1/ 4 × 1/ 4-in ch fu se (Cat. No. 270-1073).
Caution: Use only a fuse of the recommended size and type. Using
another type fuse, or defeating the fuse protection, could damage your
vehicle or your HTX-242. If the fuse frequently blows, there is a problem
with the HTX-242 or its wiring. Have that problem fixed as soon as possi-
ble.
4. Replace th e fu se in th e h older an d sn ap it closed.
41
SPECIFICATIONS
Ge ne ra l
Frequ en cy Ran ge (Factory)
Tran sm it . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144 – 148 MHz
Receive. . . . . . . . . . . . . . . . . . . . . . . . 136.000 – 174.000 MHz
Frequ en cy Step . . . . . . . . . . . . . . 5/ 10/ 12.5/ 20/ 25/ 50/ 100 kHz
Frequ en cy Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10 ppm
An ten n a Im pedan ce . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Oh m s
Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Oh m s
Microph on e . . . . . . . . . . . . . . . . . Electret Con den ser (1.2 kOh m s)
Operatin g Tem peratu re . . . . . . . . . . . . . 14 to 140°F (–10 to 60°C)
5
9
3
Dim en sion s (HWD) . . . . . . . . . . . . . . . . 1 / 8 × 5 / 16 × 6 / 16 In ch es
(42 × 142 × 160 m m )
Su pply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 13.8 V DC (±15%)
Re c e ive r
In term ediate Frequ en cy
1st IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.4 MHz
2n d IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 455 kHz
Sen sitivity
12 dB sin ad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.25 µV
20 dB n q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.39 µV
Squ elch Sen sitivity
Th resh old . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1 µV
Tigh t . . . . . . . . . . . . . . . . . . . . . . . . . 10 dB above th resh h old
Spu riou s Respon se Atten u ation . . . . . . . . . . . . Better th an 70 dB
Adjacen t Ch an n el Rejection . . . . . . . . . . . . . . . Better th an 70 dB
Modu lation Acceptan ce Ban dwidth . . . . . . . . . Better th an 7.5 kHz
Hu m an d Noise . . . . . . . . . . . . . . . . . . . . . . . . Better th an 40 dB
Au dio Ou tpu t Power at 10% THD . . . . . . . . . . . .Better th an 2.0 W
Au dio Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2%
Au dio Respon se . . . . . . . . . . . . . . . . . . . . . . . . . . . . –6 dB/ Octave
Stan d-by Cu rren t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 m A
CTCSS Sen sitivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.15 µV
DTMF Squ elch Sen sitivity. . . . . . . . . . . . . . . . . . . . . . . . . . 0.2 µV
42
Tra nsm itte r
RF Power Ou tpu t . . . . . . . . . . . . . . . . . . . 45 W (h igh )/ 10 W (Low)
Maxim u m Deviation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 kHz
Hu m an d Noise . . . . . . . . . . . . . . . . . . . . . . . . Better th an 35 dB
Au dio Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3% (TX)
Au dio Respon se . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6 dB/ Oct
Spu riou s an d Harm on ic Em ission s . . . . . . . . . Better th an 60 dB
Frequ en cy Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10 ppm
Microph on e Sen sitivity . . . . . . . . . . . . . . . . . . . . . . . . . . 4 m V rm s
CTCSS Ton e Deviation . . . . . . . . . . . . . . . . . . . . . . . . . . 0.75 kHz
DTMF Ton e Deviation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 kHz
Cu rren t Drain . . . . . . . . . . . . . . . . . . . . . . Less th an 8 A at 45 W
Less th an 4 A at 10 W
Specification s are typical; in dividu al u n its m igh t vary. Specifica-
tion s are su bject to ch an ge an d im provem en t with ou t n otice.
43
SCHEMATICS
44
RF SCHEMATIC
45
DIGITAL SCHEMATIC
46
MICROPHONE SCHEMATIC
47
Radio Shack Limited Warranty
This product is warranted against defects for 1 year from date of purchase from Radio
Shack company-owned stores and authorized Radio Shack franchisees and dealers.
Within this period, we will repair it without charge for parts and labor. Simply bring your
Radio Shack sales slip as proof of purchase date to any Radio Shack store. Warranty
does not cover transportation costs. Nor does it cover a product subjected to misuse or
accidental damage.
EXCEPT AS PROVIDED HEREIN, RADIO SHACK MAKES NO EXPRESS WARRAN-
TIES AND ANY IMPLIED WARRANTIES ARE LIMITED IN DURATION TO THE DURA-
TION OF THE WRITTEN LIMITED WARRANTIES CONTAINED HEREIN. Some states
do not permit limitation or exclusion of implied warranties; therefore, the aforesaid limita-
tion(s) or exclusion(s) may not apply to the purchaser.
This warranty gives you specific legal rights and you may also have other rights which vary from
state to state.
We Service What We Sell
10/95
Radio Shack
A Division of Tandy Corporation
Fort Worth, Texas 76102
7A6
Printed in Korea
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