Radio Shack HTX-242 User Manual

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Cat. No. 19-1126

OWNER’S MANUAL

HTX-242TWO-METERMOBILE TRANSCEIVER

Please read before using this transceiver.

INTRODUCTION

Your HTX-242Two-MeterMobile Transceiver is an exciting addition to Radio Shack’s growing line ofhigh-qualityamateur 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

!transceiver. Transmitting without a license carries heavy penalties. Getting a license is easier than ever. Your local Radio Shack store has train- ing materials for all classes of Amateur Radio Operator.License and a call sign issued by the FCC to legally transmit using this

FEATURES

Auto Memory Store (AMS)—automaticallysearches for active frequencies and stores them in memory, including the appropriate repeater offset.

High (45 Watt) and Low (10 Watt) Power Settings—let you select the best power setting for effective communications.

True FM Modulation—providesa clear,natural-soundingsignal.

41 Memory Channels—holdone calling frequency and 40 standard frequencies.

Priority Memory Channel 1—letsyou set theHTX-242to periodically check the frequency stored in Memory Channel 1 and alert you if there is activity on it.

Individually Programmable Repeater Offsets —let you program different repeater offset frequencies for each memory, and a default repeater offset for manually-tuned frequencies.

Subaudible Tone Transmit and Receive (CTCSS) —transmits the 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—letsyou set a sequence of up to seven DTMF tones that your transceiver must receive to sound an alert tone and open squelch.

DTMF Transmit and Memory —letsyou manually send DTMF tones or send DTMF sequences of up to 15 digits each from one of 10 DTMF memories to quickly accessDTMF-accessrepeaters, autopatches, or other stations equipped with a DTMF page feature.

1996 Tandy Corporation. All Rights Reserved.

Radio Shack is a registered trademark used by Tandy Corporation.

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Programmable Frequency Step—letsyou set the frequency step for tuning or scanning to 5, 10, 12.5, 20, 25, 50, or 100 kHz.

Extended Band Coverage —receivesfrom 136 to 174 MHz and lets you extend transmit coverage to include2-Meterham, MARS (Military Amateur Radio Service), and CAP (Civil Air Patrol).

Dual VFO (Variable-FrequencyOscillator) 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—listsall sections in the order they appear in the manual.

Understanding the Display—listsall display indicators and gives a brief explaination and notes the sections where the indicator is fully explained.

Using the Menu—liststhe options in the configuration menu and gives the page numbers where the options are discussed.

Quick Reference Card—givesbrief instructions for most functions.

Type Conventions—makethe references to keys and displays easier to find in the text:

Keys are bold. For example, VFO.

When a key has more than one marking (for example, DTMF andALM refer to the same key), we refer to the key by the name appropriate to the task.

Where you are instructed to press two keys at once, the keys are separated by a + symbol. For example, F+DTMF.

Text and symbols that appear on the transceiver’s display appear in a special typeface. For example, 144.940.

Important notes in this manual have a large exclamation mark (!) in the margin. Warnings and cautions you should follow to prevent injury to a person or damage to the transceiver have a large lightning bolt () in the margin.

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CONTENTS

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Unpacking the Transceiver . . . . . . . . . . . . . . . . . . . . . . . . . 6 Connecting the Microphone . . . . . . . . . . . . . . . . . . . . . . . . . 6 Mounting the HTX-242in a Vehicle . . . . . . . . . . . . . . . . . . . 7 Connecting an Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Connecting to your Vehicle’s Power . . . . . . . . . . . . . . . . . . . 9 Using theHTX-242as a Base Station . . . . . . . . . . . . . . . . 10 Using theHTX-242with 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 theHTX-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

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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-FrequencyMemory . . . . . . . . . . . . . . . . 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

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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.

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Mounting the HTX-242in 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-242to 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.

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Connecting an Antenna

You can connect a variety of antennas for both mobile and basestation use (see “Using the HTX-242as 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-stationantenna 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-242from 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-242and connect it to the antenna connector.

Connect the antenna to your HTX-242using50-ohmcoaxial cable. The cable should end in aPL-239connector.

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.

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Connecting to your Vehicle’s Power

Follow these steps to power the HTX-242in 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-ampmaximum power draw.

Or, if you do not want the HTX-242to turn on and off with your vehicle’s ignition, connect the red wire directly to the battery’s positive (+) terminal.

!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-242as a Base Station

Although we designed the HTX-242primarily for use as a mobile transceiver, you can also use it as a base station. To do so, you need these items:

13.8-VoltDC regulated power supply that can supply at least 10 amps continuous power

Base station antenna

50-ohmcoaxial antenna cable and connectors

Follow these steps to connect the HTX-242as a base station.

1.Mount the base station antenna according to its instructions.

Warning: For your safety, follow all cautions and warnings included with the base station antenna.

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.

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Using the HTX-242with Packet Radio

You can connect your HTX-242directly to a packet radio terminal node controller, as shown below.

Note: You can purchase an8-pinplug that matches your HTX242’sMIC 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-ohmcommunications 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 a1/8-inchplug. Simply plug the speaker cable into theHTX-242’sEXT. 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-cassetteadapter and amono-to-stereoaudio plug.

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UNDERSTANDING THE HTX-242

This section explains some of the HTX-242’sfeatures. See “Basic Operation” on Page 16 for instructions about how to use these features.

Dual VFO Modes

The VFO (Variable-FrequencyOscillator) modes let you directly select a frequency anywhere within theHTX-242’soperating range. YourHTX-242has two VFOs:VFO-AandVFO-B.You typically use the VFOs to tune to frequencies you have not stored into one of theHTX-242’smemory channels (see “Memory Channels” on Page 13).

A related feature of the HTX-242lets 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 fortouchtones (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-242produces 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 theHTX-242to listen for a specific set of DTMF tones, and alert you when it detects them (this feature is calledDTMF Paging). Until it hears the sequence, theHTX-242does 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.

!

Note: Group Calling only

works with the HTX-242and other transceivers

that support this feature.

 

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Subaudible Tone (CTCSS) Features

Subaudible tones, also known as CTCSS (Continuous Tone-CodedSquelch System) arelow-frequencytones 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-242includes all 38 standard subaudible tones. You can set yourHTX-242to include any of these tones with your transmissions. You can also set yourHTX-242to 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 duplex operation. Operation direct to another station where you transmit and receive on the same frequency is calledsimplex operation.

A repeater is a station that receives signals on one frequency (the input frequency) and then retransmits them on a different frequency (theoutput frequency). Repeater antennas are typically at 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 oflow-powertransceivers 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 offset (600 kHz for most of the2-meterband) and theoffset direction (+ if you add 600 kHz to the output, or – if you subtract 600 kHz from the output).

Your HTX-242is programmed with the default 600 kHz frequency offset and direction for the2-meterband. See “Frequency Offset Defaults” on Page 25. When you tune to a frequency that is normally assigned for repeater use, theHTX-242automatically selects the correct input frequency if you turned on the AS option.

Memory Channels

Your HTX-242has 41 memory channels (40 standard memory channels and onecalling-frequencymemory 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. TheHTX-242can even scan a selected range and automatically store active frequencies in unused memory locations.

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Understanding the Display

One or more of the following indicators appear when you turn on and use your HTX-242.

VFO-A orVFO-B — appears when you select one of the VFO modes. See “Dual VFO Modes” on Page 12.

VFO-A-T

VFO-B — appears when you select theDUP-Amode (transmit onVFO-Aand receive onVFO-B).See “Using the Dual VFOs for Duplex Operation” on Page 27.

VFO-A

VFO-B-T — appears when you select theDUP-Bmode (receive onVFO-Aand transmit onVFO-B).See “Using the Dual VFOs for Duplex Operation” on Page 27.

BUSY — appears when theHTX-242is receiving a transmission. See “Receiving Transmissions” on Page 22.

FUNC — appears after you pressF. Flashes after you holdF for at least 1 second.

LOCK — appears when you lock theHTX-242’sfunctions. See “Locking the Controls” on Page 17.

T — appears when transmit subaudible tone is turned on. See “Using Subaudible Tones” on Page 36.

T-SQL — appears when both transmit subaudible tone and subaudible tone squelch are turned on. See “Using Subaudible Tones” on Page 36.

ALT — appears when you turn on the DTMF page/subaudible tone alert. See “Setting the DTMF Page and Subaudible Tone Alert” on Page 37.

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+ or — indicates the duplex offset direction. See “Overriding the Duplex Offset” on Page 26.

DTMF — appears when you turn on DTMF squelch. See “Using DTMF Page” on Page 33.

HIGH orLOW — indicates the transmit power level. See “Setting the Power Level” on Page 17.

ON-AIR — appears when you transmit. See “Transmitting” on 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 “Memory Channels” on Page 13.

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BASIC OPERATION

Turning On/Off Your HTX-242

To turn your HTX-242on or off, pressPOWER. When you turn it on, all display elements briefly turn on and theHTX-242sounds five tones. Then it returns to thelast-usedsettings.

Resetting the HTX-242

When you first use your HTX-242,if it displaysPLL Err orEEP Err, or if you ever want to reset theHTX-242to the factory defaults and clear all memory, follow these steps.

!Important: This procedure clears all stored information.

1.Turn off the HTX-242.

2.While holding down F+T-SQL,turn on theHTX-242.All display elements stay on for about 1 second.

See “Extending the Transmit Frequency Range” (below) and “Using the Menu” on Page 38.

Extending the Transmit Frequency Range

The following are the HTX-242’sdefault frequency ranges:

Transmit: 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 expand the transmit frequency coverage, hold down F+DTMF while you turn on theHTX-242.The new frequency ranges are:

Transmit: 142.500 – 149.500 MHz

Receive: 136.000 – 174.000 MHz

!Note: To return to the default frequency ranges, you must reset the transceiver. See “Resetting theHTX-242”.

16

Setting Volume and Squelch

SQUELCH sets the minimum signal level that must be present for theHTX-242to amplify the signal through the speaker or to stop when scanning. Follow these steps to set the squelch.

1.Rotate SQUELCH fully counterclockwise.

2.Set VOLUME so you can hear the background hiss between transmissions.

Note: If you do not hear hissing, turnTUNE/M-CH to select a frequency that does not have communications in progress.

3.Slowly turn SQUELCH clockwise until the hissing stops.

If you turn SQUELCH too far clockwise, you might miss parts of transmissions. If you do not turnSQUELCH far enough clockwise, you hear hissing between transmissions and theHTX-242might not scan properly.

Using the Light

Your HTX-242has two display light levels. To switch between the two levels, pressF thenDIM.

Setting the Power Level

Your HTX-242has two transmit power levels. Low is about 10 watts, and high is about 45 watts. To switch between the two power levels, pressLOW.LOW orHIGH appears on the display. The power setting is saved when you store settings in memory.

Locking the Controls

To lock the controls on the microphone (except the push-to-talkbutton, PTT), slideLOCK ON to the right. This does not lock theHTX-242’sfront panel controls.

To lock all controls except POWER,VOLUME,SQUELCH, and thepush-to-talkbutton, pressF thenLOCK.LOCK appears on the display.

To unlock the controls, press F thenLOCK again.

17

Selecting a Frequency

You can select a frequency in any of three ways:

Direct entry

Tuning

Scanning

Directly Entering a Frequency

1.Press VFO to select eitherVFO-A orVFO-B.

2.Enter the last five digits of the frequency. For example, to enter 145.050, simply press 45050.

Notes:

The HTX-242rounds the last digit down to 5 or 0.

!TheHTX-242does not accept entries outside its range.

If you have turned on the AS option, the HTX-242automatically 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.

Tuning to a Frequency

1.Press VFO to select eitherVFO-A orVFO-B.

2.Rotate TUNE, or pressUP orDOWN on the microphone, to step through the frequencies.

Notes:

You can set the HTX-242to 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, pressMHz. PressMHz again to return to the previous frequency step.

If you have turned on the AS option, the HTX-242automatically 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.

18

Scanning for a Frequency

1.Press VFO to select eitherVFO-A orVFO-B.

2.Press F. Then pressto scan up orto scan down.

Notes:

You can set the HTX-242to 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-242to skip when scanning. See “Storing Scan Skip Frequencies” on Page 20.

When the HTX-242reaches 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 theHTX-242stops 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-242to 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-242stops, pressMHZ.

Setting the Frequency Step

The factory default frequency step is 20 kHz. Each time you rotate TUNE one click, or pressUP orDOWN on the microphone, the frequency changes by 20 kHz. When scanning, theHTX-242scans up or down 20 kHz per step.

Follow these steps to change the frequency step.

1.Press VFO.

2.Press F thenSTEP. TheHTX-242displaysSt and the current frequency step.

3.Rotate TUNE, or pressUP orDOWN on the microphone, to select the desired frequency step (5, 10, 12.5, 20, 25, 50, or 100 kHz).

4.Press MHz or PTT to save the setting.

19

Setting the Scan Options

Storing Scan Skip Frequencies

You can store up to five frequencies for your HTX-242to skip when scanning. This lets you prevent theHTX-242from stopping on beacon or packet repeater frequencies.

1.Press VFO.

2.Hold F for at least 1 second.FUNC flashes.

3.Press MR. TheHTX-242displaysSC and the current scan resume setting.

4.Repeatedly press until theHTX-242displaysS1 and the first scan skip frequency (or–––.–––if no frequency is stored).

5.Select the first scan skip frequency by rotating TUNE, pressingUP orDOWN on the microphone, or directly entering the last five digits of the frequency.

6.Press for the next scan skipmemory—S2,S3,S4, orS5.

7.Repeat Steps 5 and 6 for each scan skip frequency.

8.Press MR or PTT to save the setting.

Setting the Scan Resume Condition

When you scan VFO frequencies or frequencies you stored in memory, the HTX-242stops at any signal strong enough to break squelch. TheHTX-242is preset toti, meaning it resumes scanning in 10 seconds, even if the signal continues.

Follow these steps to change the scan resume condition.

1.Press VFO.

2.Hold F for at least 1 second.FUNC flashes.

3.Press MR. TheHTX-242displaysSC 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 TUNE, or pressUP orDOWN on the microphone, to select the desired option.

5.Press MR or PTT to save the setting.

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