Radio Shack HTX-242 owner manual Transmitter

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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. Specifica- tions are subject to change and improvement without notice.

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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 TroubleshootingConnecting the Microphone InstallationUnpacking 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 RadioUnderstanding the HTX-242 Dtmf Touch-Tone FeaturesDual VFO Modes Repeater Operation Subaudible Tone Ctcss FeaturesMemory 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 LevelSelecting a Frequency Tuning to a FrequencyDirectly Entering a Frequency Scanning for a Frequency Setting the Frequency StepSetting the Scan Resume Condition Setting the Scan OptionsStoring 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 OffReversing the Offset Changing the Default OffsetOverriding the Duplex Offset Using the Dual VFOs for Duplex Operation Changing Stored Settings Using Memory ChannelsStoring a Frequency Using Auto Memory Store AMS Using the Calling-Frequency Memory Tuning to a Standard Memory ChannelChecking Priority Channel Clearing a Memory Channel Scanning Memory ChannelsEnabling/Disabling Scanning for Memory Channels Storing a Dtmf Sequence Using Dtmf and Subaudible TonesTransmitting a Dtmf Sequence Using Group Calling Using DtmfName 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 General SpecificationsReceiver Transmitter Schematics RF Schematic Digital Schematic Microphone Schematic Radio Shack Division of Tandy Corporation Fort Worth, Texas