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romott(at)roadrunner.com
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 Posted: Mon Apr 16, 2007 1:51 pm Post subject: Flight Tech Intercom and Microair 760 COM |
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I am pulling all my hair out trying to figure out why a friend's intercom
and COM radio aren't working together.
This is a Flight Tech 402 panel mounted intercom and a Microair 760 COM
radio. The intercom works - pilot and copilot can communicate with each
other, both can hear radio transmissions but neither can transmit on the
radio. The transmit light comes on, when the PTT is pressed, the squelch is
broken (ie carrier is being transmitted, but no audio). Turning the
intercom off has the same results.
I have rung the wiring out, checked continuity and grounds and made sure
there are shorts.
I can remove the intercom, and place jumpers between pins 2-3 (headphone);
6-7 (pilot mike) and 9-10 (PTT), and the radio works just perfectly.
When checking the intercom on the bench, I get continuity between each of
the pairs above (diode present on 9-10).
What's my problem?????????
THANKS
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klehman(at)albedo.net
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| Posted: Mon Apr 16, 2007 5:17 pm Post subject: Flight Tech Intercom and Microair 760 COM |
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Hi Ron
You might want to call or email Flighttech? There was a circuit board
glitch in their early production boards that caused transmit problems
specifically with the icom radio. And although very rare, it is always
possible to have a bad transmit relay. You should hear the relay click
if you put your ear by the intercom when you key the mic. I think
you'll find the support and warranty is excellant and I am sure
delighted with that intercom.
Ken
Ron Brown wrote:
| Quote: |
<romott(at)roadrunner.com>
I am pulling all my hair out trying to figure out why a friend's
intercom and COM radio aren't working together.
This is a Flight Tech 402 panel mounted intercom and a Microair 760
COM radio. The intercom works - pilot and copilot can communicate
with each other, both can hear radio transmissions but neither can
transmit on the radio. The transmit light comes on, when the PTT is
pressed, the squelch is broken (ie carrier is being transmitted, but
no audio). Turning the intercom off has the same results.
I have rung the wiring out, checked continuity and grounds and made
sure there are shorts.
I can remove the intercom, and place jumpers between pins 2-3
(headphone); 6-7 (pilot mike) and 9-10 (PTT), and the radio works just
perfectly.
When checking the intercom on the bench, I get continuity between each
of the pairs above (diode present on 9-10).
What's my problem?????????
THANKS
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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