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T6T VHF 100 W Transmitter Page 13 Installation
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MARC Connector
The MARC connector is a 9-way D-type socket used to connect the transmitter 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 5.
Note ...
The line level figures shown for the MARC connector are the limits when testing the transmitter using
a sine wave; the line level will be 10 dB above the line level setting. See the information supplied
under the heading ‘Line Level Setting’ in Operation.
Table 5 MARC Connector
Pin Number Signal Characteristic
1 Ground 0 V.
2
3 Audio line in (+)
Audio line in (-)
Balanced 600 ohm, -20 to +20 dBm.
Phantom keying can be superimposed on the audio
lines. See
Fig 10 .
4 PTT input
Remote PTT signal input. See Fig 9 .
5 Output supply This output is between 21.6 and 32 Vdc (nominally
28 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.
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 3 .
1 5
6 9