ccsmith51
Joined: 08 Aug 2008
Posts: 1
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 Posted: Fri Aug 08, 2008 3:57 am Post subject: Flightline FL-760 Tranceiver and Sigtronics SPA-400 Intercom |
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I have a very, very strange issue that has to do with the FL-760 radio and the Sigtronics SPA-400 intercom.
Here is the installation:
Pilot's head set and PTT, and Co-pilot's headset and PTT are wired to the intercom with shielded cable. There are three wires from the intercom to the FL-760; audio out (mic to radio), audio in (from radio to intercom) ad transmit. Connection between the radio and intercom is through a Molex connector.
Power to the radio and intercom are from a single avionics switch. The avionics switch goes to a terminal strip and there are separate power wires to the intercom and radio. The intercom and radio each have a power switch on them.
Here is the problem:
If the intercom is plugged into the radio and I turn on the avionics switch, and then the radio switch, the radio turns on (I can transmit and receive) but the LCD display does not come on. It does not matter the state of the intercom power switch.
If the intercom is plugged into the radio and I turn on the radio switch, and then the avionics switch, the radio turns on (I can transmit and receive) and the LCD display comes on! It does not matter the state of the intercom power switch.
If the intercom is not plugged into the radio, the radio LCD display comes on regardless of the power switch sequence.
I can't see any connection at all between the LCD display and the intercom, but there obviously is one!
This has me completely stumped, so if anyone has any ideas, I'll give anything a try!!
Thanks!!
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_________________
Chris Smith
N694CS
www.cleanex.cmsdreams.com |
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