User's Guide

Page 26
Back to Transceiver
Main Page
FAC squelch out
Facilities, pin 5 Normally open relay contact
that closes when the squelch
circuits are defeated (aircraft
calling). The relay contact can
be configured to switch any
potential between -60 V and
+60Vdc.
Normally closed relay contact
that opens when the squelch
circuits are defeated (aircraft
calling). The relay contact can
be configured to switch any
potential between -60 V and
+60Vdc.
Phantom squelch
out
MARC, pin 2
MARC audio, pin 1
Phantom Squelch. Normally
open relay contact that closes
to connect a 0 V phantom
potential to the audio lines
when the squelch circuits are
defeated (aircraft calling).
Phantom Squelch. Normally
closed relay contact connecting
a 0 V potential to the audio
lines that opens when the
squelch circuits are defeated
(aircraft calling).
Squelch defeat in
Facilities pin 7 TTL input. 0 V switches off the
squelch circuits.
TTL input. 5 V switches off the
squelch circuits.
PTT Ref
.
-
PTT Ref can be set to +14 V,
0 V or -14 V. PTT state is:
+14 V Ref. key ≤+4 V
≥+24 V
u n k e y + 1 3 t o + 1 5 V
0 V Ref. key ≤-10 V
≥+10 V
unkey -1 V to +1 V
-14 V Ref. key ≤-24 V
≥-4 V
unkey -13 to -15 V
Maximum input level ±60 V
with respect to reference. Input
will draw no more than 6 mA,
and requires at least 1 mA to
operate.
PTT Ref can be set to +14 V,
0 V or -14 V. PTT state is:
+14 V Ref. unkey ≤+4 V
≥+24 V
k ey +1 3 t o + 15 V
0 V Ref. unkey ≤-10 V
≥+10 V
key -1 V to +1 V
-14 V Ref. unkey ≤-24 V
≥-4 V
key -13 to -15 V
Maximum input level ±60 V
with respect to reference. Input
will draw no more than 6 mA,
and requires at least 1 mA to
operate.
Table 8 AM-Voice and AM-MSK Polarity Settings
Signal Connector Polarity set to STD Polarity set to INV