Radio Shack Your Ultimate Guide to the HTX-242 Radio and Its Connection Options

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Using the HTX-242 with Packet Radio

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

Note: You can purchase an 8-pin plug that matches your HTX- 242’s MIC 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-ohm communications 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 a 1/8-inch plug. Simply plug the speaker cable into the HTX-242’s EXT. 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-cassette adapter and a mono-to-stereo audio plug.

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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 TroubleshootingUnpacking the Transceiver InstallationConnecting the Microphone 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 RadioDual VFO Modes Dtmf Touch-Tone FeaturesUnderstanding the HTX-242 Memory Channels Subaudible Tone Ctcss FeaturesRepeater Operation 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 LevelDirectly Entering a Frequency Tuning to a FrequencySelecting a Frequency Scanning for a Frequency Setting the Frequency StepStoring Scan Skip Frequencies Setting the Scan OptionsSetting the Scan Resume Condition 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 OffOverriding the Duplex Offset Changing the Default OffsetReversing the Offset Using the Dual VFOs for Duplex Operation Storing a Frequency Using Memory ChannelsChanging Stored Settings Using Auto Memory Store AMS Checking Priority Channel Tuning to a Standard Memory ChannelUsing the Calling-Frequency Memory Enabling/Disabling Scanning for Memory Channels Scanning Memory ChannelsClearing a Memory Channel Transmitting a Dtmf Sequence Using Dtmf and Subaudible TonesStoring a Dtmf Sequence Name Assignment Dtmf Page Sequence Using DtmfUsing Group Calling 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 Receiver SpecificationsGeneral Transmitter Schematics RF Schematic Digital Schematic Microphone Schematic Radio Shack Division of Tandy Corporation Fort Worth, Texas