User's Manual

T6T VHF 100 W Transmitter Page 14 Installation
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MARC Audio Connector
The MARC Audio connector is an 8-way RJ48 socket. It can be used as an alternative to the MARC
connector for audio and PTT connections. The connector pin-out is shown below and detailed in Table 6.
Note ...
The line level figures shown for the MARC Audio 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 6 MARC Audio Connector
Pin Number Signal Characteristic
1
2
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.
3 Fast antenna
change-over/PTT
(output)
Open collector NPN transistor grounding output,
200 mA max, configurable n/o or n/c.
4 Not used -
5 Not used -
6 PTT (input) Remote PTT signal input. See Fig 9.
7 Ground 0 V.
8 Not used -
Pin 1
RJ48 Plug
Numbering is shown looking from the top of the connector.
The top is being viewed when the lever is on the bottom.