AN~PRC-174

Control Connector Pinouts

===61 Pin Israeli Connector (Small or Hex) 1 X23 1khz BCD8 2 X50 1mhz BCD1 3 X30 10khz BCD1 4 X11 100hz BCD2 5 X10 100hz BCD1 6 X22 1khz BCD4 7 X43 100khz BCD8 8 REM CONT (ground to enable remote control) 9 N/C 10 X51 1mhz BCD2 11 X31 10khz BCD2 12 X12 100khz BCD4 13 IND (high to enable indicator functions) 14 GND 15 VOL REMOTE (remote volume control) 16 BAT IN (battery pack in, might be able to charge with this pin) 17 X21 1khz BCD2 18 X42 100khz BCD4 19 TRANSIT (pulse when 10mhz, 1mhz, 100khz or 10khz are changed) 20 NCW (high when narrow CW is selected) 21 WCW (high when wide CW is selected) 22 DATA (high when data is selected) 23 12V REM (12 volts when remote is selected) 24 X52 1mhz BCD4 25 X32 10khz BCD4 26 X13 100hz BCD8 27 BATT CHK (high to enable battery check and LED display) 28 TX LEVEL (high to enable power our and LED display) 29 TUNE (high when radio is tuning) 30 FO UNLOCK (high when synthesizer is unlocked) 31 N/C 32 S METER (analog RSSI) 33 DIP (high when radio on dipole, low when on whip) 34 X20 1khz BCD1 35 X41 100khz BCD2 36 X60 1mhz BCD1 37 AM (high to enable AM mode) 38 OFF (LOW when off – 24v when hi, caution) 39 ON (LOW when on – 24v when hi, caution) 40 USB (LOW when on USB, 12v when hi) 41 R/T (LOW when tx enabled, 12v when hi) 42 SSB (high to enable SSB mode) 43 N/C 44 X53 1mhz BCD8 45 X33 10khz BCD8 46 N/C – book says N/C but had some kind of pulsing on it 47 SAVE/SQUELCH (hi batt save mode on 174, squelch mode on 174S) 48 NO MATCH (high when no match found) 49 MIC GND 50 MIC HI 51 PHONE (handset rx audio) 52 PTT 53 +12V 54 ALC (not sure about this one...) 55 PTT 12V 56 BP (PA) (ground to bypass PA when using external amp, 100mw out) 57 FIXED AUDIO (100mv fixed audio) 58 X40 100khz BCD1 59 X61 1mhz BCD2 60 N/C – book says N/C but had some kind of pulsing on it 61 LT (M.N. BP) matching network bypass

66 Pin Round connector, add these pins

62 - SQUELCH

63 - N/C

64 - N/C

65 - MIC

66 - GND

Related Files

OM-107-10

Technical Manual

Radio Set

PRC-174

August 1976

MA(P)-2124-09514-00

ILLUSTRATED PARTS BREAKDOWN

HF-SS r. RADIO SET

RT 936/PRC as174

January 1987