Radio Shack HTX-242 owner manual Using this Manual

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

Extended Band Coverage —receives from 136 to 174 MHz and 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 directly- entered frequencies. You can also use one of the VFOs as a repeater input frequency and the other as a repeater output fre- quency for odd-split repeaters.

Using this Manual

To make this manual as easy to use as possible, we give you sev- eral ways to find information.

Contents—lists all sections in the order they appear in the man- ual.

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

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

Quick Reference Card—gives brief instructions for most func- tions.

Type Conventions—make the 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 and ALM 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 light- ning bolt ( ) in the margin.

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Contents HTX-242 TWO-METER Mobile Trans Ceiver Introduction FeaturesUsing this Manual Contents Specifications Schematics Using Memory ChannelsUsing Dtmf and Subaudible Tones Using the Menu TroubleshootingInstallation Connecting the MicrophoneUnpacking the Transceiver Mounting the HTX-242 in a Vehicle Connecting an Antenna Connecting to your Vehicle’s Power Using the HTX-242 as a Base Station Connecting an External Speaker Optional Using the HTX-242 with Packet RadioDtmf Touch-Tone Features Understanding the HTX-242Dual VFO Modes Subaudible Tone Ctcss Features Repeater OperationMemory Channels VFO-A-T Understanding the DisplayPage Extending the Transmit Frequency Range Resetting the HTX-242Basic Operation Turning On/Off Your HTX-242Locking the Controls Setting Volume and SquelchUsing the Light Setting the Power LevelTuning to a Frequency Selecting a FrequencyDirectly Entering a Frequency Scanning for a Frequency Setting the Frequency StepSetting the Scan Options Setting the Scan Resume ConditionStoring Scan Skip Frequencies Setting the Scanning Range Setting the Scan Resume DelayTransmitting Receiving TransmissionsTransmitting Dtmf Tones from Memory Manually Transmitting Dtmf TonesLimiting Transmit Duration Turning the Keytone Beep On and OffReceive Frequency Transmit Offset Frequency Offset DefaultsAdvanced Operation Turning Auto Duplex On and OffChanging the Default Offset Reversing the OffsetOverriding the Duplex Offset Using the Dual VFOs for Duplex Operation Using Memory Channels Changing Stored SettingsStoring a Frequency Using Auto Memory Store AMS Tuning to a Standard Memory Channel Using the Calling-Frequency MemoryChecking Priority Channel Scanning Memory Channels Clearing a Memory ChannelEnabling/Disabling Scanning for Memory Channels Using Dtmf and Subaudible Tones Storing a Dtmf SequenceTransmitting a Dtmf Sequence Using Dtmf Using Group CallingName Assignment Dtmf Page Sequence Using Auto-Reply Using Dtmf Auto Send Code Freq. Hz Using Subaudible TonesSetting the Subaudible Tones Valid Subaudible TonesActivating Subaudible Tone Transmit and Squelch Setting the Dtmf Page and Subaudible Tone AlertUsing the Menu OFF Menu Default Explanation/Available Settings OptionProblem Possible Solutions TroubleshootingError Codes Common Problems and SolutionsReplacing the Fuse Specifications GeneralReceiver Transmitter Schematics RF Schematic Digital Schematic Microphone Schematic Radio Shack Division of Tandy Corporation Fort Worth, Texas