11.2 Barrett 930 transceivers
Pin Name Description of function Level Option required
to activate
1 Ground Ground 0V None
2 Rx Data RS-232 data input(for cloning/programming function only) True RS-232 None
3 Tx Data RS-232 data output(for cloning/programming function only) True RS-232 None
4 External Power On For use with Barrett 960 or ancillary equipment. Low to activate None
5 External Speaker External speaker output 0-10V None
6 Tuned In Antenna tune cycle complete input from 910 / 911 Low going pulse None
7 RS-232 Gnd. RS-232 Ground (for cloning function only) 0V None
8 ALC Ext. ALC from Linear Amp 0-10V None
9 Auxiliary PTT In Auxiliary PTT input Low to activate PTT None
10 Scan Stop Scan stop input from external modem Low to stop scan None
11 Bal. Tx Audio In Balanced external Tx audio input (with pin 24) 600 Ohms 0dBm. None
12 Bal. Rx Audio Out Balanced un-muted Rx audio output (with pin 25) 600 Ohms 0dBm. None
13 Ground Ground 0V None
14 Ant 0 / Pre-amp on Channel no. output Octal bit 0 / 910 pre-amp on Active low None
15 Ant 1 Channel no. output Octal bit 1 Active low None
16 Ant 2 Channel no. output Octal bit 2 Active low None
17 External Alarm Out Horn / Latched alarm out (selcall activated) Active low BCO93002
18 13.8 V Int Out / Ant 3 Interrupted 13.8 V for 910 Auto. Antenna / Ant 3 13.8V-0V / Active Low None
19 Ant 0 / Pre-amp on 910 pre-amp on / Channel no. output Octal bit 0 Active low None
20 N/C N/C N/C None
21 PTT / C-Mute Out PTT Out / Receiver Cross Mute Out Active low None
22 CW Key Input from CW Key Low to activate None
23 +13.8 V Fused Out +13.8V Output to power auxilliary equipment 13.8V @ 2 Amp. None
24 Bal. Tx Audio In Balanced external Tx audio input (with pin 11) 600 Ohms 0dBm. None
25 Bal. Rx Audio Out Balanced un-muted Rx audio output (with pin 12) 600 Ohms 0dBm. None
Note1:- These outputs provide channel information for use with antenna select units such as the BARRETT 916. The outputs are octal coded 0
to FF representing the least significant digit of the channel number selected. i.e. octal 0 for channel 1, octal 1 for channels 2, octal 3 for
channels 2, to octal FF for channel 16.
BARRETT 900 SERIES TRANSCEIVERS
PAGE 55
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