User's Guide

Page 16
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Antenna Connectors
The antenna connectors are N-type sockets suitable for connecting 50 ohm antennas.
MARC Connector
The MARC connector is a 9-way D-type socket used for connecting to a MARC system via an RSE2. The
connector pin-out is detailed in Table 5
.
Note ...
The line level figures shown for the MARC and MARC Audio connectors are the limits when testing
the transceiver with sine wave modulation; the line level will be 10 dB above the line level setting.
See the information supplied under the heading ‘Line Level Settings’ in the Operation section.
Table 5 MARC Connector
Pin Number Signal Characteristic
1 Ground 0 V
2
3
Audio line out (+)
Audio line out (-)
Balanced 600 ohm, -20 to +20 dBm.
Phantom squelch (see Fig 14) - solid-state relay,
+60 to -60 V ac or dc, 100 mA max, configurable n/o or n/c.
Pair to pin 2.
4 Squelch (output) Solid state relay, +60 to -60 V, ac or dc, 100 mA max,
configurable n/o or n/c.
5 Unregulated supply
(output)
This output is between 21.6 and 32 Vdc (nominally 24 V)
fused at 500 mA.
6
7
Data in (+)
Data in (-)
RS422 differential asynchronous data at 9600 baud. 8 data
bits, 1 stop bit, no parity, no handshaking.
8
9
Data out (+)
Data out (-)
RS422 differential asynchronous data at 9600 baud. 8 data
bits, 1 stop bit, no parity, no handshaking.