Radio Shack HTX-242 owner manual Specifications, General, Receiver

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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 5/8 ⋅ 5 9/16 ⋅ 6 3/16 Inches (42 ⋅ 142 ⋅ 160 mm)

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 ∝V 20 dB nq. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.39 ∝V

Squelch Sensitivity

Threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1 ∝V 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 ∝V DTMF Squelch Sensitivity. . . . . . . . . . . . . . . . . . . . . . . . . . 0.2 ∝V

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Contents HTX-242 TWO-METER Mobile Trans Ceiver Features IntroductionUsing this Manual Contents Using the Menu Troubleshooting Using Memory ChannelsUsing Dtmf and Subaudible Tones Specifications SchematicsInstallation 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 Using the HTX-242 with Packet Radio Connecting an External Speaker OptionalDtmf Touch-Tone Features Understanding the HTX-242Dual VFO Modes Subaudible Tone Ctcss Features Repeater OperationMemory Channels Understanding the Display VFO-A-TPage Turning On/Off Your HTX-242 Resetting the HTX-242Basic Operation Extending the Transmit Frequency RangeSetting the Power Level Setting Volume and SquelchUsing the Light Locking the ControlsTuning to a Frequency Selecting a FrequencyDirectly Entering a Frequency Setting the Frequency Step Scanning for a FrequencySetting the Scan Options Setting the Scan Resume ConditionStoring Scan Skip Frequencies Setting the Scan Resume Delay Setting the Scanning RangeReceiving Transmissions TransmittingManually Transmitting Dtmf Tones Transmitting Dtmf Tones from MemoryTurning the Keytone Beep On and Off Limiting Transmit DurationTurning Auto Duplex On and Off Frequency Offset DefaultsAdvanced Operation Receive Frequency Transmit OffsetChanging 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 Valid Subaudible Tones Using Subaudible TonesSetting the Subaudible Tones Code Freq. HzSetting the Dtmf Page and Subaudible Tone Alert Activating Subaudible Tone Transmit and SquelchUsing the Menu Menu Default Explanation/Available Settings Option OFFCommon Problems and Solutions TroubleshootingError Codes Problem Possible SolutionsReplacing the Fuse Specifications GeneralReceiver Transmitter Schematics RF Schematic Digital Schematic Microphone Schematic Radio Shack Division of Tandy Corporation Fort Worth, Texas