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T6TR VHF 50 W Transceiver Page 20 Installation
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MARC Connector
The MARC connector is a 9-way D-type socket used to connect the transceiver to a MARC remote site
equipment, or it can also be used for normal remote operation.
As an alternative to using this connector, the RJ48 style MARC Audio and MARC Data connectors can
be used to provide the same functions.
The MARC connector pin-out is shown below and detailed in Table 7.
Note:
The line level figures shown for the MARC connector 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 Setting’ in the Operation topic.
Table 7 MARC Connector
Pin Number Signal Characteristic
1 Ground 0 V
2
3
Audio line out (+)
Audio line out (-)
Balanced 600 ohm, -30 to +10 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.
Contact closure time is less than 20 ms.
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. Contact closure time is less than
20 ms.
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.
1 5
6 9
Pin-out of MARC connector looking into the mating face of the
chassis mounted socket.
A suitable free socket is detailed in Table 2 on page 4.