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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