User's Guide

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MARC Audio Connector
The MARC Audio connector is an 8-way RJ48 socket. The connector pin-out is detailed in Table 6.
Table 6 MARC Audio Connector
Pin Number Signal Characteristic
1
2
Audio line out (-)
Audio line out (+)
Balanced 600 ohm -20 and +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.
3 Fast antenna
changeover/PTT
Open collector NPN transistor grounding output,
200 mA max, configurable n/o or n/c.
4
5
Audio line in (+)
Audio line in (-)
Balanced 600 ohm input, -20 to +20 dBm.
Phantom PTT (see Fig 13) - active when input differs
from reference by more than ±10 V. Inactive when
input differs from reference by less than ±1 V.
Maximum input level ±60 V with respect to reference.
Input will draw no more than 6 mA, requires at least
1 mA to operate. Configurable active high or low.
Common reference to all inputs programmable to
+14, 0 or -14 V (±1 V).
6 Squelch
(output)
Solid state relay, +60 to -60 V, ac or dc, 100 mA max,
configurable n/o or n/c.
7Ground 0 V.
8 PTT (input) Active when input differs from reference by more than
±10 V. Inactive when input differs from reference by
less than ±1 V. Maximum input level ±60 V with
respect to reference. Input will draw no more than
6 mA, requires at least 1 mA to operate. Configurable
active high or low. Common reference to all inputs
programmable to +14, 0 or -14 V (±1 V).