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Radio Shack 19-1126, Owner'S Manual

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Cat. No. 19-1126

OWNER’S MANUAL

HTX-242 TWO-METER MOBILE TRANS-

CEIVER

Please read before using this transceiver.

Summary of Contents for 19-1126

Page 1: ...Cat No 19 1126 OWNER S MANUAL HTX 242 TWO METER MOBILE TRANS CEIVER Please read before using this transceiver...

Page 2: ...offset frequencies for each memory and a default repeater offset for manually tuned frequencies Subaudible Tone Transmit and Receive CTCSS transmits the subaudible tones required to use some repeater...

Page 3: ...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 w...

Page 4: ...on 16 Turning On Off Your HTX 242 16 Resetting the HTX 242 16 Extending the Transmit Frequency Range 16 Setting Volume and Squelch 17 Using the Light 17 Setting the Power Level 17 Locking the Controls...

Page 5: ...nnel 1 30 Scanning Memory Channels 31 Clearing a Memory Channel 31 Enabling Disabling Scanning for Memory Channels 31 Using DTMF and Subaudible Tones 32 Storing a DTMF Sequence 32 Transmitting a DTMF...

Page 6: ...check to be sure you have all the items shown in this illustration Connecting the Microphone Plug the microphone s connector into the microphone jack secure the microphone holder to either the left or...

Page 7: ...points Use the supplied screws metal washers bracket rubber washers and mounting knobs as shown to mount the transceiver Cautions To avoid damaging your vehicle s electronic systems contact your vehic...

Page 8: ...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...

Page 9: ...d from the vehicle s frame by a plastic part 2 Connect the red wire to a source of voltage that turns on and off with the ignition and that can handle the transceiver s 10 amp maximum power draw Or if...

Page 10: ...nna cable and connectors Follow these steps to connect the HTX 242 as a base station 1 Mount the base station antenna according to its instruc tions 2 Connect the antenna cable to the antenna jack on...

Page 11: ...ernal 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 spea...

Page 12: ...et of tones is used by many different amateur radio sys tems for accessing programmable features and dialing through autopatches Your HTX 242 produces all 16 standard DTMF tones 0 9 A B C and D It has...

Page 13: ...reach the repeater The repeater retransmits the signal at a higher power This gives users of low power transceivers the ability to communicate over a much greater range To use a repeater you must know...

Page 14: ...he Dual VFOs for Duplex Operation on Page 27 BUSY appears when the HTX 242 is receiving a transmission See Receiving Transmissions on Page 22 FUNC appears after you press F Flashes after you hold F fo...

Page 15: ...tes the transmit power level See Setting the Power Level on Page 17 ON AIR appears when you transmit See Transmitting on Page 22 appears when you turn on the Channel 1 alarm Flashes when there is a tr...

Page 16: ...tay on for about 1 second See Extending the Transmit Frequency Range below and Using the Menu on Page 38 Extending the Transmit Frequency Range The following are the HTX 242 s default frequency ranges...

Page 17: ...clockwise you hear hissing between transmissions and the HTX 242 might not scan properly Using the Light Your HTX 242 has two display light levels To switch between the two levels press F then DIM Se...

Page 18: ...its range If you have turned on the AS option the HTX 242 automatically selects the correct duplex offset for frequencies normally assigned to repeaters and selects no offset for other frequencies See...

Page 19: ...or 100 kHz steps The default is 20 kHz See Setting the Frequency Step on Page 19 You can program up to five frequencies for the HTX 242 to skip when scanning See Storing Scan Skip Frequencies on Page...

Page 20: ...or the next scan skip memory S2 S3 S4 or S5 7 Repeat Steps 5 and 6 for each scan skip frequency 8 Press MR or PTT to save the setting Setting the Scan Resume Condition When you scan VFO frequencies or...

Page 21: ...you scan in a VFO mode the HTX 242 scans frequencies within a selected range The default range is 144 0 to 148 0 MHz Follow these steps to change the scanning range 1 Press VFO 2 Hold F for at least...

Page 22: ...f you select a repeater frequency the HTX 242 dis plays or to show the offset direction To operate with no offset simplex on that frequency press SHIFT until neither nor appears 2 Press LOW so LOW app...

Page 23: ...he desired DTMF memory 4 Press and hold PTT Then press DTMF to send the current DTMF memory Note If auto reply is turned on you must hold down PTT while you trans mit If auto reply is off you can rele...

Page 24: ...n or oFF if the option is off 5 Rotate TUNE or press UP or DOWN on the microphone to select the desired time out time to turn on the time out option or oFF to turn off the option 6 Press MR or PTT to...

Page 25: ...at least 1 second FUNC flashes 3 Press MR 4 Repeatedly press or until the HTX 242 displays AS and either on if the option is on or oFF if the option is off 5 Rotate TUNE or press UP or DOWN on the mic...

Page 26: ...when you operate duplex press F then REV For example if you tune to 146 940 which has a offset pressing F then REV makes the transceiver receive on 146 340 and transmit on 146 940 The setting returns...

Page 27: ...ss VFO to select VFO A 2 Select a frequency 3 Press VFO to select VFO B 4 Select a frequency 5 Press DUP When the HTX 242 displays VFO A T VFO B it transmits on the VFO A frequency and receives on the...

Page 28: ...nging Stored Settings To change the receive frequency follow the steps under Storing a Frequency To change the transmit frequency or a tone squelch option without changing the receive frequency follow...

Page 29: ...steps to have the HTX 242 scan through a selected range and store active frequencies in memory 1 Set the upper and lower scan limits see Setting the Scan ning Range on Page 21 2 Set the scanning step...

Page 30: ...y 4 8 12 or 16 seconds If there is a transmission the HTX 242 beeps to let you know to tune to it if desired Follow these steps to change the look back time 1 Press VFO 2 Hold F for at least 1 second...

Page 31: ...y 1 Tune to the memory channel you want to clear 2 Hold F for at least 1 second FUNC flashes 3 Press MR All settings are cleared from the memory channel Enabling Disabling Scanning for Memory Channels...

Page 32: ...nd rd appears with receive DTMF Memory 0 4 Press SHIFT Then use the keypad to enter the sequence you want to store Note DTMF Memories 1 10 hold 15 digits each DTMF Memory 0 holds 7 digits 5 Repeat Ste...

Page 33: ...operates as if it received the entire sequence For example if these sequences are assigned to a group Notes If you turn on auto reply the HTX 242 immediately sends the sequence in the currently select...

Page 34: ...42 automatically sends the sequence stored in the currently selected DTMF memory when it receives a DTMF page Follow these steps to turn on auto reply 1 Press VFO 2 Hold F for at least 1 second FUNC f...

Page 35: ...or PTT to save the setting 6 Press DTMF so DTMF is on the display To temporarily turn off auto send press DTMF so DTMF is not on the display To turn off auto send set the option to oFF in Step 4 Note...

Page 36: ...r the VFO mode After you set the tones you must activate the function to turn it on Changing this setting does not change the tones stored in any memory channel 1 Press VFO 2 Hold F for at least 1 sec...

Page 37: ...ncludes the selected transmit tone with your transmissions and requires the selected receive tone to open squelch 3 Press T SQL a third time to turn off both subaudible tone transmit and squelch Neith...

Page 38: ...se the menu 1 Press VFO 2 Hold F for at least 1 second FUNC flashes 3 Press MR The first menu item appears Then press or to select the desired menu option 4 Rotate TUNE or press UP or DOWN on the micr...

Page 39: ...ority Memory Channel 1 for a transmission when the alarm is activated 4 8 12 or 16 30 SL 144 000 Lower scan limit With SH determines the VFO scanning range 21 SH 148 000 Upper scan limit 21 Ar oFF Aut...

Page 40: ...be operating properly check this section for a possible solution Problem Possible Solutions Signal strength meter shows a signal and BUSY appears but no sound from speaker Be sure DTMF is not on the d...

Page 41: ...emove the fuse from the holder and slide the fuse out of the end connectors 3 If the fuse s filament is no longer intact replace the fuse with a 15 amp 11 4 1 4 inch fuse Cat No 270 1073 4 Replace the...

Page 42: ...upply 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 threshhol...

Page 43: ...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...

Page 44: ...44 SCHEMATICS...

Page 45: ...45 RF SCHEMATIC...

Page 46: ...46 DIGITAL SCHEMATIC...

Page 47: ...47 MICROPHONE SCHEMATIC...

Page 48: ...o any Radio Shack store Warranty does not cover transportation costs Nor does it cover a product subjected to misuse or accidental damage EXCEPT AS PROVIDED HEREIN RADIO SHACK MAKES NO EXPRESS WARRAN...

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