PRC-174

picture of PRC-174 HF pack set

THE PRC-174 AND PRC-174S ARE MILITARY HF PACKSETS, REPORTED TO BE OF AMERICAN DESIGN AND MANUFACTURED BY TADIRAN IN ISRAEL.

THE FOLLOWING ARE KNOWN ACCESSORIES FOR THE PRC-174: AT-271 WHIP ANTENNA, ST-2734 BACKPACK CARRIER, AB-10 WHIP MOUNT, H-259/U HANDSET, AFTERMARKET BATTERY BOX.

THE PRC-174S IS IDENTICAL TO THE PRC-174 WITH THE EXCEPTION OF THE IF AND ADUIO MODULE, AND A FEW MINOR MOTHERBOARD WIRING CHANGES.

THE STANDARD PRC-174 HAS A VOICE-OPERATED SQUELCH (VOS) WHICH IS IMPLEMENTED IN THE STANDARD AUDIO MODULE. THE PRC-174S HAS AN FSK DIGITAL SQUELCH AND A DIFFERENT AUDIO MODULE. THIS DIGITAL SQUELCH IS GENERALLY DISABLED BY A SIMPLE MOD FOR USE IN THE HAM BANDS, RESULTING IN NO SQUELCH CIRCUIT. I AM WORKING ON OPTIONS TO IMPLEMENT ONE OF THE SEVERAL AVAILABLE VOICE OPERATED SQUELCH CIRCUITS INTO A MODIFIED PRC-174S TO RESTORE A VOICE SQUELCH FUNCTION. THE EASIEST AND MOST LIKELY IMPLEMENTATION WILL BE TO MODIFY A MILITARY SPEAKER WITH THE NOISE SQUELCH CIRCUIT BOARD POWERED BY A 9V BATTERY. THERE IS JUST NOT ENOUGH ROOM INSIDE THE SET TO FIT THE CIRCUIT BOARD IN. STAY TUNED FOR MORE INFO ON THIS.

HERE ARE SOME USEFUL LINKS CONTAINING ADDITIONAL PRC-174 INFORMATION: