AN~PRC-174

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PRC-174.png

Images

Control Connector Pinouts

All BCD levels for frequency control are 12v high to enable that digit.

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

Adobe PDF icon.png OM-107-10

Technical Manual
Radio Set
PRC-174
August 1976


Adobe PDF icon.png MA(P)-2124-09514-00

ILLUSTRATED PARTS BREAKDOWN
HF-SS r. RADIO SET
RT 936/PRC as174
January 1987


Adobe PDF icon.png MA 2124-09503-00

Maintenance Manual
HF-SSB RADIO SET
PRC-174
July 1986