Radio Shack HTX-242 owner manual Connecting an Antenna

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Connecting an Antenna

You can connect a variety of antennas for both mobile and base- station use (see “Using the HTX-242 as 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-station antenna and its loca- tion, 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-242 from per- forming to its specified ratings.

After you select an antenna, follow its mounting instructions. Then route the antenna cable from the antenna to the HTX-242 and connect it to the antenna connector.

Connect the antenna to your HTX-242 using 50-ohm coaxial cable. The cable should end in a PL-239 connector.

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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Contents HTX-242 TWO-METER Mobile Trans Ceiver Features IntroductionUsing this Manual Contents Using Memory Channels Using Dtmf and Subaudible TonesUsing the Menu Troubleshooting Specifications SchematicsUnpacking 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 Using the HTX-242 with Packet Radio Connecting an External Speaker OptionalDual VFO Modes Dtmf Touch-Tone FeaturesUnderstanding the HTX-242 Memory Channels Subaudible Tone Ctcss FeaturesRepeater Operation Understanding the Display VFO-A-TPage Resetting the HTX-242 Basic OperationTurning On/Off Your HTX-242 Extending the Transmit Frequency RangeSetting Volume and Squelch Using the LightSetting the Power Level Locking the ControlsDirectly Entering a Frequency Tuning to a FrequencySelecting a Frequency Setting the Frequency Step Scanning for a FrequencyStoring Scan Skip Frequencies Setting the Scan OptionsSetting the Scan Resume Condition 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 DurationFrequency Offset Defaults Advanced OperationTurning Auto Duplex On and Off Receive Frequency Transmit OffsetOverriding 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 Using Subaudible Tones Setting the Subaudible TonesValid 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 OFFTroubleshooting Error CodesCommon Problems and Solutions Problem Possible SolutionsReplacing the Fuse Receiver SpecificationsGeneral Transmitter Schematics RF Schematic Digital Schematic Microphone Schematic Radio Shack Division of Tandy Corporation Fort Worth, Texas