Cat. No. 19-1126
OWNER’S MANUAL
HTX-242 TWO-METER MOBILE TRANS-
CEIVER
Please read before using this transceiver.
!
INTRODUCTION
Your HTX-242 Two-Meter Mobile Transceiver is an exciting addition to Radio Shack’s growing line of high-quality amateur radio
equipment. It offers some of the most advanced, and most
requested, features available in a mobile transceiver. Be sure to
read this entire manual to understand how to use all the radio’s
features.
You must have a Technician Class or higher Amateur Radio Operator’s
License and a call sign issued by the FCC to legally transmit using this
transceiver. Transmitting without a license carries heavy penalties. Getting a license is easier than ever. Your local Radio Shack store has training materials for all classes of Amateur Radio Operator.
FEATURES
Auto Memory Store (AMS)
quencies and stores them in memory, including the appropriate
repeater offset.
High (45 W att) and Low (1 0 Watt) Power Settings
the best power setting for effective communications.
True FM Modulation
41 Memory Channels
dard frequencies.
Priority Memory Channel 1
ically check the frequency stored in Memory Channel 1 and alert
you if there is activity on it.
Individually Programmable Repeater Offsets
different repeater offset frequencies for each memory, and a
default repeater offset for manually-tuned frequencies.
Subaudible Tone Transmit and Receive (CTCSS)
subaudible tones required to use some repeaters, and also lets you
set a subaudible tone that your transceiver must receive to open
squelch.
DTMF Page with Group Calling
seven DTMF tones that your transceiver must receive to sound an
alert tone and open squelch.
DTMF Transmit and Memory
tones or send DTMF sequences of up to 15 digits each from one of
10 DTMF memories to quickly access DTMF-access repeaters,
autopatches, or other stations equipped with a DTMF page feature.
1996 Tandy Corporation.
Radio Shack is a registered trademark used by Tandy Corporation.
All Rights Reserved.
—automatically searches for active fre-
—let you select
—provides a clear, natural-sounding signal.
—hold one calling frequency and 40 stan-
—lets you set the HTX-242 to period-
—let you program
—transmits the
—lets you set a sequence of up to
—lets you manually send DTMF
2
Programmable Frequency Step
for tuning or scanning to 5, 10, 12.5, 20, 25, 50, or 100 kHz.
—lets you set the frequency step
Extended Band Coverage
lets you extend transmit coverage to include 2-Meter ham, MARS
(Military Amateur Radio Service), and CAP (Civil Air Patrol).
Dual VFO (Variable-Frequency Oscillator) and Duplex Modes
two independent VFOs let you quickly select between two directlyentered frequencies. You can also use one of the VFOs as a
repeater input frequency and the other as a repeater output frequency for odd-split repeaters.
Using this Manual
To make this manual as easy to use as possible, we give you several ways to find information.
Contents
ual.
Understanding the Display
a brief explaination and notes the sections where the indicator is
fully explained.
Using the Menu
gives the page numbers where the options are discussed.
Quick Reference Card
tions.
Type Conventions
easier to find in the text:
—receives from 136 to 174 MHz and
—
—lists all sections in the order they appear in the man-
—lists all display indicators and gives
—lists the options in the configuration menu and
—gives brief instructions for most func-
—make the references to keys and displays
• Keys are bold. For example,
• When a key has more than one marking (for example,
ALM
and
name appropriate to the task.
• Where you are instructed to press two keys at once, the keys
are separated by a + symbol. For example,
• Text and symbols that appear on the transceiver’s display
appear in a special typeface. For example,
Important notes in this manual have a large exclamation mark (!)
in the margin. W arnings and cautions you should follow to prevent
injury to a person or damage to the transceiver have a large lightning bolt ( ) in the margin.
refer to the same key), we refer to the key by the
VFO
.
DTMF
F+DTMF
144.940
.
.
3
CONTENTS
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Unpacking the Transceiver . . . . . . . . . . . . . . . . . . . . . . . . . 6
Connecting the Microphone . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mounting the HTX-242 in a Vehicle . . . . . . . . . . . . . . . . . . . 7
Connecting an Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Connecting to your Vehicle’s Power . . . . . . . . . . . . . . . . . . . 9
Using the HTX-242 as a Base Station . . . . . . . . . . . . . . . . 10
Using the HTX-242 with Packet Radio . . . . . . . . . . . . . . . . 11
Connecting an External Speaker (Optional) . . . . . . . . . . . . 11
Understanding the HTX-242 . . . . . . . . . . . . . . . . . . . . . . . 12
Dual VFO Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
DTMF (Touch-Tone) Features . . . . . . . . . . . . . . . . . . . . . . 12
Subaudible Tone (CTCSS) Features . . . . . . . . . . . . . . . . . . 13
Repeater Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Memory Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Understanding the Display . . . . . . . . . . . . . . . . . . . . . . . . 14
Basic Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Turning On/Off Your HTX-242 . . . . . . . . . . . . . . . . . . . . . 16
Resetting the HTX-242 . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Extending the Transmit Frequency Range . . . . . . . . . . . . . 16
Setting Volume and Squelch . . . . . . . . . . . . . . . . . . . . . . . 17
Using the Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Setting the Power Level . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Locking the Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Selecting a Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Directly Entering a Frequency . . . . . . . . . . . . . . . . . . . 18
Tuning to a Frequency . . . . . . . . . . . . . . . . . . . . . . . . 18
Scanning for a Frequency . . . . . . . . . . . . . . . . . . . . . . 19
Setting the Frequency Step . . . . . . . . . . . . . . . . . . . . . . . . 19
Setting the Scan Options . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Storing Scan Skip Frequencies . . . . . . . . . . . . . . . . . . 20
Setting the Scan Resume Condition . . . . . . . . . . . . . . 20
Setting the Scan Resume Delay . . . . . . . . . . . . . . . . . . 21
Setting the Scanning Range . . . . . . . . . . . . . . . . . . . . 21
Receiving Transmissions . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Transmitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Manually Transmitting DTMF Tones . . . . . . . . . . . . . . 23
Transmitting DTMF Tones from Memory . . . . . . . . . . . 23
Limiting Transmit Duration . . . . . . . . . . . . . . . . . . . . 24
Turning the Keytone Beep On and Off . . . . . . . . . . . . . . . . 24
4
Advanced Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Frequency Offset Defaults . . . . . . . . . . . . . . . . . . . . . . . . . 25
Turning Auto Duplex On and Off . . . . . . . . . . . . . . . . 25
Changing the Default Offset . . . . . . . . . . . . . . . . . . . . 26
Reversing the Offset . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Overriding the Duplex Offset . . . . . . . . . . . . . . . . . . . . 26
Using the Dual VFOs for Duplex Operation . . . . . . . . . . . . 27
Using Memory Channels . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Storing a Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Changing Stored Settings . . . . . . . . . . . . . . . . . . . . . . . . . 28
Using Auto Memory Store (AMS) . . . . . . . . . . . . . . . . . . . . 29
Tuning to a Standard Memory Channel . . . . . . . . . . . . . . . 30
Using the Calling-Frequency Memory . . . . . . . . . . . . . . . . 30
Checking Priority Channel 1 . . . . . . . . . . . . . . . . . . . . . . . 30
Scanning Memory Channels . . . . . . . . . . . . . . . . . . . . . . . 31
Clearing a Memory Channel . . . . . . . . . . . . . . . . . . . . . . . 31
Enabling/Disabling Scanning for Memory Channels . . . . . 31
Using DTMF and Subaudible Tones . . . . . . . . . . . . . . . . . . 32
Storing a DTMF Sequence . . . . . . . . . . . . . . . . . . . . . . . . . 32
Transmitting a DTMF Sequence . . . . . . . . . . . . . . . . . . . . 32
Using DTMF Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Using Group Calling . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Using Auto-Reply . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Using DTMF Auto Send . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Using Subaudible Tones . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Valid Subaudible Tones . . . . . . . . . . . . . . . . . . . . . . . 36
Setting the Subaudible Tones . . . . . . . . . . . . . . . . . . . 36
Activating Subaudible Tone Transmit and Squelch . . . 37
Setting the DTMF Page and Subaudible Tone Alert . . . . . . 37
Using the Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Common Problems and Solutions . . . . . . . . . . . . . . . . . . . 40
Replacing the Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5
INSTALLATION
Unpacking the Transceiver
As you unpack the transceiver, check to be sure you have all the
items shown in this illustration.
Connecting the Microphone
Plug the microphone’s connector into the microphone jack, secure
the microphone holder to either the left or right side of the transceiver, then clip the microphone to the holder.
6
Mounting the HTX-242 in a Vehicle
When you select a mounting location for the HTX-242, be sure:
• You can easily reach it
• No wires or cables will interfere with the vehicle’s operation
• It is not directly in front of heating vents
• All wires will reach their connection points
Cautions:
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 locations, and power and antenna cable routing guidelines.
Do not apply power to the transceiver until after you properly
•
mount and connect an antenna.
Use the supplied screws, metal washers, bracket, rubber washers,
and mounting knobs, as shown, to mount the transceiver.
7
Connecting an Antenna
You can connect a variety of antennas for both mobile and basestation use (see “Using the HTX-242 as a Base Station” on
Page 10). Each type of antenna has its benefits. Choose one that
best meets your needs.
When deciding on a mobile or base-station antenna and its location, consider the following:
• The antenna should be as high as possible on your vehicle or
house.
• The antenna and antenna cable should be as far away as
possible from sources of electrical noise (ignition systems,
power cables, and so on).
• The antenna should be vertical.
• The antenna should have an SWR of less than 1.5:1. An
SWR of 1.8:1 or greater can prevent the HTX-242 from performing to its specified ratings.
After you select an antenna, follow its mounting instructions. Then
route the antenna cable from the antenna to the HTX-242 and
connect it to the antenna connector.
Connect the antenna to your HTX-242 using 50-ohm coaxial cable.
The cable should end in a PL-239 connector.
Cautions:
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.
8
Connecting to your Vehicle’s Power
!
Follow these steps to power the HTX-242 in your vehicle.
1. Connect the black wire to your vehicle battery’s negative (–)
terminal or to a metal part of the vehicle’s frame. Be sure the
metal part is not insulated from the vehicle’s frame by a
plastic part.
2. Connect the red wire to a source of voltage that turns on and
off with the ignition and that can handle the transceiver’s
10-amp maximum power draw.
Or, if you do not want the HTX-242 to turn on and off with
your vehicle’s ignition, connect the red wire directly to the
battery’s positive (+) terminal.
You might need to connect the red wire directly to the battery if you
Note:
experience ignition noise.
9
Using the HTX-242 as a Base Station
Although we designed the HTX-242 primarily for use as a mobile
transceiver, you can also use it as a base station. To do so, you
need these items:
• 13.8-Volt DC regulated power supply that can supply at
least 10 amps continuous power
• Base station antenna
• 50-ohm coaxial antenna cable and connectors
Follow these steps to connect the HTX-242 as a base station.
1. Mount the base station antenna according to its instructions.
10
Warning:
the base station antenna.
For your safety, follow all cautions and warnings included with
2. Connect the antenna cable to the antenna jack on the back
of the HTX-242.
3. Connect the black power wire to the power supply’s negative
(–) terminal.
4. Connect the red power wire to the power supply’s positive (+)
terminal.
5. Connect the power supply to a source of power.
Using the HTX-242 with Packet Radio
You can connect your HTX-242 directly to a packet radio terminal
node controller, as shown below.
Note:
You can purchase an 8-pin plug that matches your HTX-
MIC
242’s
jack at your local Radio Shack store (Cat. No. 279-440).
Connecting an External Speaker (Optional)
You can connect an external speaker to your HTX-242.
Use an 8-ohm communications or PA speaker that can handle 5 or
more watts of power (such as Radio Shack Cat. No. 21-549). The
speaker’s cable must end in a 1/8-inch plug. Simply plug the
speaker cable into the HTX-242’s
EXT. SP
jack.
If your vehicle has a cassette player, you can easily connect your
transceiver to your vehicle’s audio system using a CD-to-cassette
adapter and a mono-to-stereo audio plug.
11
UNDERSTANDING THE HTX-242
!
This section explains some of the HTX-242’s features. See “Basic
Operation” on Page 16 for instructions about how to use these features.
Dual VFO Modes
The VFO (Variable-Frequency Oscillator) modes let you directly
select a frequency anywhere within the HTX-242’s operating range.
Your HTX-242 has two VFOs: VFO-A and VFO-B. You typically use
the VFOs to tune to frequencies you have not stored into one of the
HTX-242’s memory channels (see “Memory Channels” on Page 13).
A related feature of the HTX-242 lets you transmit on the frequency selected with one VFO and receive on the frequency
selected with the other VFO. (See “Using the Dual VFOs for Duplex
Operation” on Page 27.)
DTMF (Touch-Tone) Features
DTMF (Dual-Tone, Multiple Frequency) is another term for
tones
(the tones a telephone produces when you press a digit). This
standard set of tones is used by many different amateur radio systems for accessing programmable features and dialing through
autopatches.
Your HTX-242 produces all 16 standard DTMF tones (0-9, ✱, #, A,
B, C, and D). It has 10 DTMF memories which can each hold up to
15 digits for quick transmission. You can also set the HTX-242 to
listen for a specific set of DTMF tones, and alert you when it
detects them (this feature is called
sequence, the HTX-242 does not pass any transmissions to the
speaker.
Group Calling lets you DTMF page a single person or an entire
group of people. To use group calling, every person in the group
selects the same first three digits as their DTMF page sequence.
They then select up to four additional digits unique to each person.
To page an individual, you transmit their entire DTMF page
sequence. To page the entire group, you transmit at least the first
three digits of the sequence, followed by the DTMF tones for A, B,
and C.
Group Calling only works with the HTX-242 and other transceivers
Note:
that support this feature.
DTMF Paging
). Until it hears the
touch-
12
Subaudible Tone (CTCSS) Features
Subaudible tones, also known as CTCSS (Continuous Tone-Coded
Squelch System) are low-frequency tones that are mixed with a
transmission. They are used by many repeaters to limit interference from other nearby radio transmitters. When a repeater uses a
subaudible tone, it does not react to any transmission that does
not include that tone.
Your HTX-242 includ es all 38 standard subaudible tones. You can
set your HTX-242 to include any of these tones with your transmissions. You can also s et your HT X-242 to limit reception to only
those transmissions that include the selected tone.
Repeater Operation
Operation through a repeater, where you transmit on one frequency and receive on another, is called
tion direct to another station where you transmit and receive on
the same frequency is called
simplex
duplex
operation.
operation. Opera-
A repeater is a station that receives signals on one frequency (the
input
frequency) and then retransmits them on a different frequency (the
the tops of tall buildings or on antenna towers, so a relatively lowpower signal can reach the repeater. The repeater retransmits the
signal at a higher power . This gives users of low-power tran sceivers
the ability to communicate over a much greater range.
To use a repeater, you must know the repeater’s input and output
frequencies. Repeaters are usually identified by their output frequency. Thus, a repeater that has an output frequency of 146.94 is
referred to as the 146.94 repeater. To determine the input frequency you must know the frequency
the 2-meter band) and the
the output, or – if you subtract 600 kHz from the output).
Your HTX-242 is programmed with the default 600 kHz frequency
offset and direction for the 2-meter band. See “Frequency Offset
Defaults” on Page 25. When you tune to a frequency that is normally assigned for repeater use, the HTX-242 automatically selects
the correct input frequency if you turned on the AS option.
Memory Channels
Your HTX-242 has 41 memory channels (40 standard memory
channels and one calling-frequency memory channel). Each memory channel can hold a transmit and receive frequency, subaudible
transmit and receive tones, the transmit power level, and whether
subaudible tone transmit and squelch are on or off. The HTX-242
can even scan a selected range and automatically store active frequencies in unused memory locations.
output
frequency). Repeater antennas are typically at
offset
(600 kHz for most of
offset direction
(+ if you add 600 kHz to
13
Understanding the Display
One or more of the following indicators appear when you turn on
and use your HTX-242.
VFO-A
modes. See “Dual VFO Modes” on Page 12.
or
VFO-B
— appears when you select one of the VFO
VFO-A-T
VFO-B
— appears when you select the DUP-A mode (transmit
on VFO-A and receive on VFO-B). See “Using the Dual VFOs for
Duplex Operation” on Page 27.
VFO-A
VFO-B-T
VFO-A and transmit on VFO-B). See “Using the Dual VFOs for
Duplex Operation” on Page 27.
BUSY
See “Receiving Transmissions” on Page 22.
FUNC
least 1 second.
LOCK
“Locking the Controls” on Page 17.
T
— appears when transmit subaudible tone is turned on. See
“Using Subaudible Tones” on Page 36.
T-SQL
audible tone squelch are turned on. See “Using Subaudible Tones”
on Page 36.
ALT
alert. See “Setting the DTMF Page and Subaudible Tone Alert” on
Page 37.
— appears when you select the DUP-B mode (receive on
— appears when the HTX-242 is receiving a transmission.
— appears after you press F. Flashes after you hold F for at
— appears when you lock the HTX-242’s functions. See
— appears when both transmit subaudible tone and sub-
— appears when you turn on the DTMF page/subaudible tone
14
+ or –
Duplex Offset” on Page 26.
DTMF
DTMF Page” on Page 33.
— indicates the duplex offset direction. See “Overriding the
— appears when you turn on DTMF squelch. See “Using
HIGH
Power Level” on Page 17.
ON-AIR
Page 22.
— appears when you turn on the Channel 1 alarm. Flashes
when there is a transmission on Memory Channel 1 and the alarm
is turned on. See “Checking Priority Channel 1” on Page 30.
M-CH
— appears when you tune to a memory channel. See “Mem-
ory Channels” on Page 13.
LOW
or
— indicates the transmit power level. See “Setting the
— appears when you transmit. See “Transmitting” on
15
BASIC OPERATION
!!!
Turning On/Off Your HTX-242
To turn your HTX-242 on or off, press
on, all display elements briefly turn on and the HTX-242 sounds
five tones. Then it returns to the last-used settings.
POWER
Resetting the HTX-242
When you first use your HTX-242, if it displays
Err
, or if you ever want to reset the HTX-242 to the factory
defaults and clear all memory, follow these steps.
Important:
1. Turn off the HTX-242.
2. While holding down
See “Extending the Transmit Frequency Range” (below) and “Using
the Menu” on Page 38.
This procedure clears all stored information.
F+T-SQL
All display elements stay on for about 1 second.
, turn on the HTX-242.
Extending the Transmit Frequency Range
The following are the HTX-242’s default frequency ranges:
. When you turn it
PLL Err
or
EEP
16
Transmit: 144.000 – 148.000 MHz
Receive: 136.000 – 174.000 MHz
Important:
are licensed to operate on MARS or CAP frequencies.
To expand the transmit frequency coverage, hold down
while you turn on the HTX-242. The new frequency ranges are:
Transmit: 142.500 – 149.500 MHz
Receive: 136.000 – 174.000 MHz
Note:
ceiver. See “Resetting the HTX-242”.
Do not expand the transmit frequency coverage unless you
F+DTMF
To return to the default frequency ranges, you must reset the trans-
Setting Volume and Squelch
SQUELCH
the HTX-242 to amplify the signal through the speaker or to stop
when scanning. Follow these steps to set the squelch.
If you turn
transmissions. If you do not turn
you hear hissing between transmissions and the HTX-242 might
not scan properly.
sets the minimum signal level that must be present for
1. Rotate
2. Set
transmissions.
Note:
frequency that does not have communications in progress.
3. Slowly turn
SQUELCH
VOLUME
If you do not hear hissing, turn
SQUELCH
Using the Light
Your HTX-242 has two display light levels. To switch between the
two levels, press
Setting the Power Level
Your HTX-242 has two transmit power levels. Low is about 10
watts, and high is about 45 watts. To switch between the two
power levels, press
power setting is saved when you store settings in memory.
fully counterclockwise.
so you can hear the background hiss between
TUNE/M-CH
SQUELCH
too far clockwise, you might miss parts of
F
then
LOW
clockwise until the hissing stops.
DIM
.
LOW
.
or
SQUELCH
HIGH
far enough clockwise,
appears on the display. The
to select a
Locking the Controls
To lock the controls on the microphone (except the push-to-talk
button, PTT), slide
HTX-242’s front panel controls.
To lock all controls except
push-to-talk button, press
play.
To unlock the controls, press
LOCK ON
to the right. This does not lock the
POWER, VOLUME, SQUELCH
F
then
F
then
LOCK
LOCK
LOCK
.
again.
, and the
appears on the dis-
17
Selecting a Frequency
!
!
You can select a frequency in any of three ways:
• Direct entry
• Tuning
• Scanning
Directly Entering a Frequency
1. Press
2. Enter the last five digits of the frequency. For example, to
Notes:
•
•
•
VFO
to select either
enter 145.050, simply press
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 “Turning Auto Duplex On and Off” on Page 25.
VFO-A
45050
or
.
VFO-B
.
Tuning to a Frequency
1. Press
2. Rotate
Notes:
•
VFO
to select either
TUNE
through the frequencies.
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 1 9.
, or press UP or
VFO-A
DOWN
VFO-B
or
on the microphone, to step
.
18
To step in 1 MHz increments, press
•
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 “Turning Auto Duplex On and Off” on Page 25.
MHz. Press MHz again to
Scanning for a Frequency
!
1. Press
2. Press F. Then press ▲ to scan up or ▼ to scan down.
Notes:
•
•
•
•
•
•
VFO
to select either
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 1 9.
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 “Setting the Scanning Range” on Page 21.
When the HTX-242 stops on a transmission, it either stops scanning, 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.
VFO-A
or
VFO-B
.
To resume scanning after the HTX-242 stops, press
•
Setting the Frequency Step
The factory default frequency step is 20 kHz. Each time you rotate
TUNE
one click, or press UP or
quency changes by 20 kHz. When scanning, the HTX-242 scans up
or down 20 kHz per step.
Follow these steps to change the frequency step.
1. Press
2. Press F then
3. Rotate
4. Press
VFO
.
STEP
frequency step.
TUNE
select the desired frequency step (5, 10, 12.5, 20, 25, 50, or
100 kHz).
, or press UP or
MHz
or PTT to save the setting.
MHZ.
DOWN
on the microphone, the fre-
. The HTX-242 displays St and the current
DOWN
on the microphone, to
19
Setting the Scan Options
Storing Scan Skip Frequencies
You can store up to five frequencies for your HTX-242 to skip when
scanning. This lets you prevent the HTX-242 from stopping on
beacon or packet repeater frequencies.
1. Press
2. Hold F for at least 1 second.
3. Press MR. The HTX-242 displays SC and the current scan
4. Repeatedly press
5. Select the first scan skip frequency by rotating
6. Press
7. Repeat Steps 5 and 6 for each scan skip frequency.
8. Press MR or PTT to save the setting.
VFO
.
FUNC
flashes.
resume setting.
until the HTX-242 displays S1 and the
first scan skip frequency (or –––.––– if no frequency is
stored).
UP
ing
last five digits of the frequency.
DOWN
or
for the next scan skip memory—S2, S3, S4, or S5.
▲
▲
TUNE
, press-
on the microphone, or directly entering the
Setting the Scan Resume Condition
When you scan VFO frequencies or frequencies you stored in memory, the HTX-242 stops at any signal strong enough to break
squelch. The HTX-242 is preset to ti, meaning it resumes scanning in 10 seconds, even if the signal continues.
Follow these steps to change the scan resume condition.
1. Press
VFO
.
20
2. Hold F for at least 1 second.
3. Press MR. The HTX-242 displays SC and the current option.
ti
Resumes scanning in 10 seconds
cr
Resumes scanning after the carrier drops and the
scan resume delay expires
SE
Does not resume scanning
4. Rotate
select the desired option.
5. Press
TUNE
, or press UP or
MR
or PTT to save the setting.
FUNC
flashes.
DOWN
on the microphone, to
Setting the Scan Resume Delay
!
When you set the scan resume condition to cr (carrier), the HTX242 resumes scanning after the carrier drops. The scan resume
delay option lets you set the HTX-242 to pause before resuming so
you can hear replies. The factory default is 2 seconds.
Follow these steps to change the scan resume delay.
1. Press
2. Hold F for at least 1 second.
3. Press MR.
4. Repeatedly press ▲ until the HTX-242 displays Sd and the
5. Rotate
6. Press
VFO
.
FUNC
flashes.
current scan resume delay (0.5, 1, 2, or 4 seconds).
TUNE
select the desired scan resume delay.
, or press UP or
MR
or PTT to save the setting.
DOWN
on the microphone, to
Setting the Scanning Range
When you scan in a VFO mode, the HTX-242 scans frequencies
within a selected range. The default range is 144.0 to 148.0 MHz.
Follow these steps to change the scanning range.
1. Press
2. Hold F for at least 1 second.
3. Press MR.
4. Repeatedly press ▲ until the HTX-242 displays SL and the
5. Rotate
VFO
.
FUNC
flashes.
lower scan limit.
TUNE
, press UP or
directly enter the lower scan limit’s last five digits on the
microphone’s keypad.
DOWN
on the microphone, or
6. Press
7. Rotate
directly enter the upper scan limit’s last five digits on the
microphone’s keypad.
8. Press MR or PTT to save the settings.
The frequency gap between the lower and upper scan limits should
Note:
be no less than two times the current frequency step. If the frequency gap
is less than this, the HTX-242 does not scan.
. The HTX-242 displays SH and the upper scan limit.
▲
TUNE
, press UP or
DOWN
on the microphone, or
21
Receiving Transmissions
!
!
To receive a transmission, turn on the HTX-242, adjust the volume
and squelch, and tune to the frequency you want to monitor. The
HTX-242 displays
the relative signal strength when it receives a signal.
BUSY
, and the signal-strength indicator shows
Transmitting
Note:
sure the DTMF page and tone-squelch features are turned off and
SQUELCH
To turn off tone squelch, press
appears on the display. See “Activating Subaudible Tone Transmit
and Squelch” on Page 37.
Caution:
higher) license issued by the FCC.
BUSY
If
1. Select the desired frequency.
Note:
plays
offset (simplex) on that frequency, press
nor
2. Press
low power (10 watt) setting.
3. Press the push-to-talk button (PTT) on the side of the microphone to transmit. The signal strength meter shows halfscale for low power (or full-scale for high power). Release PTT
to listen for a reply.
appears but you hear nothing from the speaker, be
is set correctly. To turn off DTMF page, press
It is illegal to transmit if you do not have a Technician Class (or
If you select a repeater frequency, the HTX-242 dis-
+
or – to show the offset direction. To operate with no
–
appears.
LOW
so
appears on the display. This selects the
LOW
T-S QL
until neither T nor
SHIFT
DTMF
once.
T-SQL
until neither +
22
Notes:
If the other party advises you to improve your signal, press
•
appears on the display, and the HTX-242 transmits at high
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 Err
and beeps twice.
LOW.
Manually Transmitting DTMF Tones
!
!
To transmit DTMF tones, follow the steps for transmitting. Then,
while holding down PTT, press the digits on the microphone to
transmit the tones.
If auto-reply is turned on, you must hold down PTT while you trans-
Note:
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.
Transmitting DTMF Tones from Memory
1. Press
2. To select a different DTMF memory, press and hold
3. Rotate
4. Press and hold PTT. Then press
Notes:
•
•
DTMF
so the HTX-242 displays
DTMF memory number.
least 1 second. Then press
TUNE
or press ▲ or ▼ to select the desired DTMF
memory.
DTMF memory.
If you turn on the DTMF auto send option and turn on DTMF mem-
appears on the display), the HTX-242 sends the DTMF
DTMF
ory (
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.
DTMF
DTMF
and the current
.
DTMF
to send the current
F
for at
23
Limiting Transmit Duration
!
When you communicate on the 2-meter band, you should keep
your transmissions as brief as possible. Most repeaters have builtin timers that limit single transmissions to 3 minutes or less.
You can set the transceiver to stop transmitting and sound a beep
if a single transmission exceeds the selected time (none, 1, 2, 3, 5,
7, 10, or 15 minutes). Follow these steps to select the transmission
time-out setting.
1. Press
2. Hold F for at least 1 second.
3. Press MR.
4. Repeatedly press ▲ until the HTX-242 displays to and
5. Rotate
6. Press MR or PTT to save the settings.
VFO
.
either the selected time (if the option is on) or
option is off).
TUNE
, or press UP or
select the desired time-out time (to turn on the time out
option) or
oFF
(to turn off the option).
DOWN
Turning the Keytone Beep On and Off
Your HTX-242 sounds a beep each time you press a button. Follow
these steps to turn off this keytone beep.
This does not affect the tone-alert beep, alarm scan beep, or the
Note:
transmit limit beep.
1. Press
2. Hold F for at least 1 second.
VFO
.
FUNC
flashes.
on the microphone, to
FUNC
flashes.
oFF
(if the
24
3. Press MR.
4. Repeatedly press ▲ until the HTX-242 displays bp and
either
5. Rotate
select
option).
6. Press
on
(if the beep option is on) or
TUNE
, or press UP or
on
(to turn on the beep option) or
MR
or PTT to save the settings.
DOWN
oFF
(if the option is off).
on the microphone, to
oFF
(to turn off the
ADVANCED OPERATION
!
Frequency Offset Defaults
When you select a frequency, the HTX-242 defaults to the following
frequency offsets if auto duplex is turned on:
Receive Frequency Transmit Offset
Below 144.600 MHz No offset (Simplex)
144.600 to 144.905 MHz + offset
144.910 to 145.205 MHz No offset (Simplex)
145.210 to 145.505 MHz – offset
145.510 to 146.005 MHz No offset (Simplex)
146.010 to 146.375 MHz + offset
146.380 to 146.605 MHz No offset (Simplex)
146.610 to 146.995 MHz – offset
147.000 to 147.395 MHz + offset
147.400 to 147.595 MHz No offset (Simplex)
147.600 to 147.995 MHz – offset
148.000 MHz and above No offset (Simplex)
The default offset is 600 kHz. For example, if you tune to receive
146.940 MHz, the HTX-242 automatically transmits at 146.340
MHz (600 kHz less than 146.940).
Outside these ranges, the HTX-242 operates with no offset.
Note:
Turning Auto Duplex On and Off
The HTX-242 can automatically select the correct duplex offset for
frequencies normally assigned to repeaters and selects no offset
(simplex) for other frequencies. Follow these steps to turn this
option on or off.
either
select
VFO
.
on
(if the option is on) or
TUNE
, or press UP or
on
oFF
or
.
FUNC
flashes.
oFF
(if the option is off).
DOWN
on the microphone, to
25
1. Press
2. Hold F for at least 1 second.
3. Press MR.
4. Repeatedly press ▲ or ▼ until the HTX-242 displays AS and
5. Rotate
6. Press MR or PTT to save the setting.
Changing the Default Offset
!
Follow these steps to change the default offset for the VFO modes.
1. Press
2. Hold F for at least 1 second.
3. Press
4. Rotate
5. Press
This setting does not affect frequencies already stored in memory.
Note:
VFO
.
FUNC
flashes.
SHIFT
. The HTX-242 displays oS and the current offset
(in MHz).
TUNE
directly enter the step using the microphone’s keypad to
select an offset default (from 0 to 38 MHz).
, press UP or
SHIFT
or PTT to save the setting.
DOWN
on the microphone, or
Reversing the Offset
To reverse the transmit and receive frequencies when you operate
duplex, press
(which has a – offset), pressing
receive on 146.340 and transmit on 146.940. The setting returns
to the default if you change frequencies.
F
then
REV
. For example, if you tune to 146.940
F
then
REV
makes the transceiver
Overriding the Duplex Offset
26
When you tune to a frequency, the HTX-242 automatically selects
either simplex operation, or duplex operation with the correct offset direction (if the auto duplex option is on). To override this setting, press
between +, –, and no offset. The setting returns to the default if you
change frequencies.
SHIFT
. Each time you press
SHIFT
, the offset switches
Using the Dual VFOs for Duplex Operation
Follow these steps to use one VFO to transmit and the other to
receive.
1. Press
2. Select a frequency.
3. Press
4. Select a frequency.
5. Press
VFO
to select
VFO
to select
DUP
.
When the HTX-242 displays:
VFO-A
VFO-B
.
.
VFO-A-T
VFO-B
it transmits on the VFO-A frequency and receives on the
VFO-B frequency.
When it displays:
VFO-A
VFO-B-T
it transmits on the VFO-B frequency and receives on the
VFO-A frequency.
27
USING MEMORY CHANNELS
The HTX-242 has 40 standard memory channels and one callingfrequency memory, where you can store frequently-used frequencies, along with all settings, for quick access.
Storing a Frequency
1. Press
2.
VFO
and tune to a frequency you want to store. Set all
duplex and subaudible tone settings (see “Using Subaudible
Tones” on Page 36), the transmit power setting, and the
DTMF option.
To store the frequency in the calling-fr equency memory,
press and hold
display. Then press
To store the frequency in a standard memory,
Rotate
the HTX-242 displays the desired memory number to the left
of the frequency. Then press MR. The HTX-242 beeps twice
and stores all settings into the selected memory channel.
TUNE
Changing Stored Settings
To change the receive frequency, follow the steps under “Storing a
Frequency.” To change the transmit frequency or a tone squelch
option without changing the receive frequency, follow these steps.
1. To change the calling memory, press
To change a standard memory, press MR. Then rotate
or press
ory channel you want to change.
2. If you want to turn tone squelch on or off, repeatedly press
SQL
Subaudible Tones” on Page 36.)
UP
or
to select the desired tone squelch mode. (See “Using
F
for at least 1 second.
CALL
.
, or press UP or
DOWN
on the microphone, to select the mem-
FUNC
flashes on the
DOWN
on the microphone, until
CALL
.
press F.
TUNE
,
T-
28
For the calling-frequency memory,
3.
UP
CALL
.
press F, then press MR.
DOWN
DOWN
or
one second. Then press
For a standard memory,
The HTX-242 displays rF and the receive frequency, and
CH
flashes.
4. Rotate
the receive frequency using the microphone’s keypad.
5. Press
quency.
6. Rotate
the transmit frequency using the microphone’s keypad.
TUNE
, press UP or
. The HTX-242 displays tF and the transmit fre-
▲
TUNE
, press
press and hold
on the microphone, or enter
on the microphone, or enter
F
for
M-
7. Press ▲. The HTX-242 displays rC and the current receive
!
subaudible tone.
8. Rotate
change the receive subaudible tone.
9. Press
subaudible tone.
10. Rotate
change the transmit subaudible tone.
For the calling-frequency memory,
11.
settings.
For a standard memory,
Sn
select whether the memory is included in a memory scan
(On) or locked out of a memory scan (
save all settings.
TUNE
, or press UP or
. The HTX-242 displays tC and the current transmit
▲
TUNE
, or press UP or
. Rotate
TUNE
, or press UP or
Using Auto Memory Store (AMS)
Follow these steps to have the HTX-242 scan through a selected
range and store active frequencies in memory.
1. Set the upper and lower scan limits (see “Setting the Scanning Range” on Page 21).
2. Set the scanning step (see “Setting the Frequency Step” on
Page 19).
3. Set the squelch (see “Setting Volume and Squelch” on
Page 17).
DOWN
DOWN
press
on the microphone, to
on the microphone, to
CALL
press
. The HTX-242 displays
▲
DOWN
on the microphone, to
Off
). Then press MR to
to save all
4. Hold
5. To stop auto store before all memories are used, press
Notes:
•
•
F
for at least 1 second. Then press
The HTX-242 scans between the lower and upper scan limits. When it detects a transmission, it checks all memories to
see if that frequency is already stored. If the frequency is not
in a memory, the HTX-242 stores the frequency in the lowest
unused memory, then resumes scanning. The HTX-242 continues auto store until all memories are used.
DUP, MR, CALL
The HTX-242 turns off tone squelch during auto store.
Auto store does not work if all memories are used.
, or
MHz
.
MHz
.
VFO
,
29
Tuning to a Standard Memory Channel
!
1. Press MR.
2. Rotate
select the desired memory channel.
M-CH
, or press UP or
DOWN
Using the Calling-Frequency Memory
CALL
Press
frequency memory.
Notes:
•
•
. The HTX-242 recalls all settings saved in the calling-
If you rotate TUNE, press UP or DOWN, or directly enter a frequency, 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.
Checking Priority Channel 1
To have the HTX-242 periodically “look back” at Memory Channel
1 to check for a transmission, press
display. The HTX-242 looks back at Memory Channel 1 every 4, 8,
12, or 16 seconds. If there is a transmission, the HTX-242 beeps to
let you know to tune to it, if desired.
Follow these steps to change the look-back time.
1. Press
VFO
.
on the microphone, to
F
then
ALM
. appears on the
30
2. Hold F for at least 1 second.
3. Repeatedly press ▲ until the HTX-242 displays Lb and the
current look-back time.
TUNE
4. Rotate
select the desired look-back time (4, 8, 12, or 16 seconds).
5. Press
, or press UP or
MR
or PTT to save the setting.
FUNC
flashes. Then press MR.
DOWN
on the microphone, to
Scanning Memory Channels
!
To set the HTX-242 to scan memory channels, press and release
MR
. Then press and hold MR for at least 1 second. .flashes, and
the HTX-242 scans memories that have the scan option turned on
(see “Enabling/Disabling Scanning for Memory Channels” on this
page). The HTX-242 stops when it encounters a transmission. It
resumes scanning according to the saved scan settings (see “Setting the Scan Options” on Page 20). To resume scanning immediately, press
MHz
.
Scanning stops if you press
Note:
MR or PTT.
Clearing a Memory Channel
You can clear any memory channel except Memory Chann el 1 and
the calling-frequency memory.
1. Tune to the memory channel you want to clear.
2. Hold
3. Press MR. All settings are cleared from the memory channel.
F
for at least 1 second.
FUNC
flashes.
Enabling/Disabling Scanning for Memory Channels
You can disable (lock out) individual memory channels, so the
HTX-242 does not stop on them when you scan memory channels.
1. Tune to the memory channel you want to enable or disable
for scanning.
2. Press F, then press MR.
3. Repeatedly press ▲ until the HTX-242 displays Sn and the
scan setting.
4. To enable scanning for the current channel, rotate
UP
press
or
DOWN
on the microphone, to select on.
TUNE
, or
To disable scanning for the current channel, rotate
UP
DOWN
press
5. Press MR or PTT to save the setting.
or
on the microphone, to select
oFF
TUNE
.
, or
31
USING DTMF AND SUBAUDIBLE TONES
!
!
Your HTX-242 has 10 DTMF (Dual-Tone, Multiple Frequency—
another name for
DTMF sequences. DTMF Memory 0 can hold a 7-digit DTMF paging
sequence your HTX-242 must receive for DTMF paging. DTMF
Memories 1-10 each hold 15 digits you can quickly transmit.
Storing a DTMF Sequence
touch tones
) memories where you can store
1. Hold down F for at least 1 second.
2. Press
3. Rotate
4. Press
5. Repeat Steps 3 and 4 to store more DTMF sequences, or
To clear a DTMF sequence, repeat these steps but do not enter a
Note:
frequency in Step 4 after you press
DTMF
. The HTX-242 displays the sequence stored in
the currently selected memory.
TUNE
, or press UP or
select one of the 10 transmit DTMF memories (1–10) or the
receive DTMF memory (0).
Note:
td appears with transmit DTMF Memories 1-10, and
rd
appears with receive DTMF Memory 0.
SHIFT
. Then use the keypad to enter the sequence you
want to store.
Note:
DTMF Memories 1–10 hold 15 digits each. DTMF
Memory 0 holds 7 digits.
DTMF
press
mal operation.
or PTT to save all sequences and return to nor-
Transmitting a DTMF Sequence
DOWN
SHIFT.
FUNC
flashes.
on the microphone, to
32
1. Hold F for at least 1 second.
2. Rotate
select the DTMF memory that contains the sequence you
want to transmit.
3. Press the push-to-talk button. While holding down PTT,
press
If the DTMF auto send feature is turned on, the HTX-242 transmits
Note:
the tones in the selected DTMF memory every time you press PTT.
TUNE
, or press UP or
DTMF
. The HTX-242 transmits the stored sequence.
FUNC
flashes.
DOWN
on the microphone, to
Using DTMF Page
!
DTMF page lets other operators page you. To turn on DTMF page,
press
missions to the speaker until it receives the sequence you stored in
DTMF Memory 0. If DTMF Memory 0 is empty, DTMF page does
not operate.
When you receive a DTMF page, the HTX-242 turns on the speaker
and turns off DTMF page so all transmissions come through.
Notes:
•
•
•
DTMF
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-2 42 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.
so
DTMF
appears. The HTX-242 does not pass trans-
Using Group Calling
Group calling lets you page several users at once. Each user must
have a transceiver that has this feature. When the HTX-242
receives at least three DTMF tones followed by the sequence A-B-C,
it compares the DTMF tones it received before the A-B-C with the
sequence in DTMF Memory 0. If the tones match, it operates as if it
received the entire sequence.
For example, if these sequences are assigned to a group:
Name Assignment DTMF Page Sequence
George West Side 4654321
Bob West Side 4654254
Doug East Side 4651823
Bill North Side 4652252
Cary East Side 4651855
Paul South Side 4653552
Kim North Side 4652183
James South Side 4653122
Beth East Side 4651931
33
• Assuming all club members have DTMF page activated, to
page everyone, transmit 465ABC.
• To page West Side members, transmit 4654ABC.
• To page Doug and Cary, transmit 46518ABC.
• To page only one person, transmit the 7-digit sequence.
Using Auto-Reply
If you turn on the auto-reply feature, the HTX-242 automatically
sends the sequence stored in the currently-selected DTMF memory
when it receives a DTMF page.
Follow these steps to turn on auto-reply.
1. Press
2. Hold F for at least 1 second.
3. Press MR. The HTX-242 displays the first configuration menu
4. Repeatedly press
5. Press MR or PTT to save the setting.
To turn off auto-reply, set the option to
VFO
item.
TUNE
, or press UP or
option to
.
on
FUNC
flashes.
▲
to select the Ar option. Then rotate
DOWN
on the microphone, to set the
.
oFF
in Step 4.
34
Using DTMF Auto Send
!
If you turn on the DTMF auto-send feature, the HTX-242 automatically sends the sequence stored in the currently-selected DTMF
memory every time you press PTT.
Follow these steps to turn on auto send.
1. Press
2. Hold F for at least 1 second.
3. Press MR.
4. Repeatedly press ▲ to select the dA option. Then rotate
5. Press MR or PTT to save the setting.
6. Press
To temporarily turn off auto send, press
the display. To turn off auto send, set the option to
Notes:
•
•
VFO
.
FUNC
flashes.
TUNE
, or press UP or
DTMF
on
.
so
option to
This feature works with the DTMF page feature. If you stored a
sequence in DTMF Memory 0, the HTX-242 does not pass transmissions 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.
DOWN
DTMF
is on the display.
on the microphone, to set the
DTMF
so
DTMF
oFF
is not on
in Step 4.
35
Using Subaudible Tones
Some repeaters require you to transmit a subaudible tone to activate them. You can set your HTX-242 to transmit any of the 38
standard subaudible tones. You can also limit incoming reception
by setting the HTX-242 to open the squelch only when someone
transmits a subaudible tone you select.
Valid Subaudible Tones
Code Freq. (Hz) Code Freq. (Hz) Code Freq. (Hz)
XZ 67.0 1B 107.2 6Z 167.9
XA 71.9 2E 110.9 6A 173.8
WA 74.4 2A 114.8 6B 179.9
XB 77.0 2B 118.8 7Z 186.2
WB 79.7 3Z 123.0 7A 192.8
YZ 82.5 3A 127.3 M1 203.5
YA 85.4 3B 131.8 M2 210.7
YB 88.5 4Z 136.5 M3 218.1
ZZ 91.5 4A 141.3 M4 225.7
ZA 94.8 4B 146.2 M5 233.6
ZB 97.4 5Z 151.4 M6 241.8
1Z 100.0 5A 156.7 M7 250.3
1A 103.5 5B 162.2
36
Setting the Subaudible Tones
Some repeaters require you to transmit a subaudible tone with
your transmission. You can also set a tone that must accompany
transmissions for your HTX-242 to open squelch.
Follow these steps to set the subaudible tones for the VFO mode.
After you set the tones, you must activate the function to turn it
on. Changing this setting does not change the tones stored in any
memory channel.
1. Press
2. Hold F for at least 1 second.
3. Press
4. Rotate
VFO
.
FUNC
flashes.
T-SQL
receive tone.
a different receive tone. If you do not want a receive tone,
select
. The HTX-242 displays rC and the currently set
TUNE
, or press UP or
oFF
.
DOWN
on the microphone, to set
5. Press ▲. The HTX-242 displays tC and the currently set
transmit tone.
6. Rotate
a different transmit tone. If you do not want a transmit tone,
select
7. Press
TUNE
, or press UP or
oFF
.
T-SQL
or PTT to save the settings.
DOWN
on the microphone, to set
Activating Subaudible Tone Transmit and Squelch
1. Press
2. Press
3. Press
T-SQL
once. T appears. The HTX-242 includes the
selected transmit tone with your transmissions.
T-SQL
again.
the selected transmit tone with your transmissions and
requires the selected receive tone to open squelch.
T-SQL
a third time to turn off both subaudible tone
transmit and squelch. Neither
display.
T-SQL
appears. The HTX-242 includes
T
T-SQL
nor
appears on the
Setting the DTMF Page and Subaudible Tone Alert
When the alert function is turned on, the HTX-242 sounds a
sequence of three tones when it receives a DTMF page (if DTMF
page is activated) or a transmission that includes the correct subaudible tone (if tone squelch is activated).
To turn on the alert function, press
turn off the alert function, press
F
then
F
then
ALT
ALT
ALT
.
again.
appears. To
ALT
disappears.
37
USING THE MENU
Your HTX-242 has a menu that lets you select how some functions
work. The previous sections included procedures that access this
menu—this section provides an overview. Follow these steps to
use the menu:
1. Press
2. Hold F for at least 1 second.
3. Press MR. The first menu item appears. Then press ▲ or ▼
4. Rotate
5. Press
VFO
.
FUNC
flashes.
to select the desired menu option.
TUNE
select the setting. For options that require a frequency (such
as scan skip), you can use the microphone keypad to directly
enter the frequency’s last five digits.
, or press UP or
MR
or PTT to save the settings.
DOWN
on the microphone, to
38
Menu
Item
Default
Option
SC ti
Sd 2.0
S1 –––.–––
S2 –––.–––
S3 –––.–––
S4 –––.–––
S5 –––.–––
Lb 4
SL 144.000
SH 148.000
Ar oFF
to oFF
bp oN
AS on
dA oFF
Explanation/Available Settings Page #
Scan resume option.
ti
—time out in 10 seconds.
Cr
—resume after carrier drops.
SE
—do not resume scanning.
Scan delay (delay before resume when
SC
is set to Cr).
Scan skip frequency 1 (frequency for
HTX-242 to skip when scanning VFO).
Scan skip frequency 2. 20
Scan skip frequency 3. 20
Scan skip frequency 4. 20
Scan skip frequency 5. 20
Look-back time (how often the HTX-
242 checks Priority Memory Channel 1
for a transmission when the alarm is
activated).
Lower scan limit. With SH, determines
the VFO scanning range.
Upper scan limit. 21
Auto reply (controls whether the HTX-
242 transmits a DTMF memory
sequence when it is DTMF paged).
on
.
or
Time-out option (sets whether the
HTX-242 limits transmissions).
1, 2, 3, 5, 7, 10
Keytone beep option. 24
Auto duplex/simplex option (controls
whether the HTX-242 uses the standard repeater offsets).
DTMF auto send (controls whether the
HTX-242 transmits the contents of the
currently-selected DTMF memory each
time you press PTT).
0.5, 1, 2
4, 8, 12
, or 15.
, or 16.
oFF
oFF
, or 4.
oFF
oFF
or on.
or on.
20
21
20
30
21
34
24
,
25
35
39
TROUBLESHOOTING
Error Codes
Your HTX-242 has the following three built-in error codes.
tF Err
(see “Extending the Transmit Frequency Range” on Page 16).
PLL Err
tion malfunctions. If turning the HTX-242 off then back on does
not correct this error, take it to your local Radio Shack store to
arrange for service.
EEP Err
resetting the HTX-242 (see “Resetting the HTX-242” on Page 16). If
this does not clear the error, take it to your local Radio Shack store
to arrange for service.
—appears if you try to transmit outside the allowed range
—appears if the HTX-242’s PLL (phase-locked loop) sec-
—appears if the HTX-242’s EEPROM checksum fails. Try
Common Problems and Solutions
If your HTX-242 does not seem to be operating properly, check this
section for a possible solution.
Problem Possible Solutions
Signal strength meter
shows a signal and
BUSY
appears, but no
sound from speaker.
Be sure
press
Be sure
is, press
appears.
Be sure
erly adjusted.
DTMF
is not on the display. If it is,
DTMF
to turn off DTMF page.
T-SQL
VOLUME
is not on the display. If it
T-S QL
until neither T nor
SQUELCH
and
T-SQL
are prop-
40
Be sure nothing is plugged into the
SP
jack.
No controls operate. Be sure
press F then
Be sure
its leftmost position.
Other party cannot
hear your transmission.
The display does not
light when you press
POWER
.
Be sure the duplex offset is set correctly.
Set the output power to high by pressing
LOW
so
Check the power connections.
Check the fuse (see “Replacing the Fuse”
on Page 41).
LOCK
is not on the display. If it is,
LOCK
to unlock the controls.
LOCK
on the microphone is set to
HIGH
appears on the display.
EXT.
Replacing the Fuse
Your HTX-242 (and vehicle) are protected by a 15-amp fuse in the
HTX-242’s positive (red) power wire. If the HTX-242 does not turn
on, even when you are sure the power wire is properly connected to
a 12V DC power source, check the fuse and replace it, if necessary.
1. Snap open the in-line fuse holder.
2. Remove the fuse from the holder, and slide the fuse out of
the end connectors.
3. If the fuse’s filament is no longer intact, replace the fuse with
a 15-amp 1
Caution:
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 possible.
Use only a fuse of the recommended size and type. Using
4. Replace the fuse in the holder and snap it closed.
1
/4 × 1/4-inch fuse (Cat. No. 270-1073).
41
SPECIFICATIONS
General
Frequency Range (Factory)
Transmit . . . . . . . . . . . . . . . . . . . . . . . . . . . . .144 – 148 MHz
Receive. . . . . . . . . . . . . . . . . . . . . . . . 136.000 – 174.000 MHz
Frequency Step . . . . . . . . . . . . . . 5/10/12.5/20/25/50/100 kHz
Frequency Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10 ppm
Antenna Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Ohms
Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Ohms
Microphone . . . . . . . . . . . . . . . . .Electret Condenser (1.2 kOhms)
Operating Temperature . . . . . . . . . . . . . 14 to 140°F (–10 to 60°C)
Dimensions (HWD). . . . . . . . . . . . . . . .1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . .13.8 V DC (±15%)
Receiver
Intermediate Frequency
1st IF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.4 MHz
2nd IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 455 kHz
Sensitivity
12 dB sinad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.25 µV
20 dB nq. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.39 µV
Squelch Sensitivity
Threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1 µV
Tight. . . . . . . . . . . . . . . . . . . . . . . . . 10 dB above threshhold
Spurious Response Attenuation . . . . . . . . . . . . Better than 70 dB
Adjacent Channel Rejection . . . . . . . . . . . . . . . Better than 70 dB
Modulation Acceptance Bandwidth. . . . . . . . . Better than 7.5 kHz
Hum and Noise . . . . . . . . . . . . . . . . . . . . . . . . Better than 40 dB
Audio Output Power at 10% THD . . . . . . . . . . . .Better than 2.0 W
Audio Distortion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2%
Audio Response . . . . . . . . . . . . . . . . . . . . . . . . . . . .–6 dB/Octave
Stand-by Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 mA
CTCSS Sensitivity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.15 µV
DTMF Squelch Sensitivity. . . . . . . . . . . . . . . . . . . . . . . . . . 0.2 µV
5
/8 × 59/16 × 63/16 Inches
(42 × 142 × 160 mm)
42
Transmitter
RF Power Output . . . . . . . . . . . . . . . . . . . 45 W (high)/10 W (Low)
Maximum Deviation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 kHz
Hum and Noise . . . . . . . . . . . . . . . . . . . . . . . . Better than 35 dB
Audio Distortion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3% (TX)
Audio Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6 dB/Oct
Spurious and Harmonic Emissions . . . . . . . . . Better than 60 dB
Frequency Error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10 ppm
Microphone Sensitivity. . . . . . . . . . . . . . . . . . . . . . . . . .4 mV rms
CTCSS Tone Deviation . . . . . . . . . . . . . . . . . . . . . . . . . . 0.75 kHz
DTMF Tone Deviation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 kHz
Current Drain . . . . . . . . . . . . . . . . . . . . . . Less than 8 A at 45 W
Less than 4 A at 10 W
Specifications are typical; individual units might vary. Specifications are subject to change and improvement without notice.
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
Radio Shack sales slip
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 WARRANTIES AND ANY IMPLIED WARRANTIES ARE LIMITED IN DURATION TO THE DURATION OF THE WRITTEN LIMITED WARRANTIES CONTAINED HEREIN. Some states
do not permit limitation or exclusion of implied warranties; therefore, the aforesaid limitation(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.
as proof of purchase date to any Radio Shack store. Warranty
We Service What We Sell
bring your
10/95
Radio Shack
A Division of Tandy Corporation
Fort Worth, Texas 76102
7A6 Printed in Korea
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