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M20Kid ![]() Groupie ![]() Joined: 19 Aug 2015 Location: AZ Status: Offline Points: 79 |
![]() Posted: 06 Aug 2018 at 8:17pm |
I'm posting this in the Audio Panel space because it's the only hardware common to both radios. Read my story and let me know if I need to call for an exorcism. I was
flying about 1000 nm last week (yes, home from OSH) and at least half a
dozen times I lost the ability to hear incoming comm on BOTH radios! It
happened while with Chicago center, Minneapolis center, Kansas City
center, and Fort Worth center; I don't think there were all having
transmission issues on the same day. Here's what I know - 1.
All would be quiet and I would get an urgent call from either center or
another airplane center had pressed into service to help contact me.
When I would answer I could always hear fine and the transmissions from
other aircraft and center with both strong and clear. 2.
Other times it was the reverse, things would be quiet and I would key
up for a radio check. Two or three calls later I would hear the
response and they would always tell me they heard every request and
responded each time. I only heard after several responses. 3. I switched to my backup radio and had the same thing happen! 4.
At one point I turned an ATIS freq that was nearby and monitored.
Things were fine for a while and then the transmission stopped. The RX
indicator on the 540 was not lit. When ATIS was again audible it was
the same broadcast as before. The time was not the appropriate time for
a change to ATIS. 5. While I do not believe my
airplane was hit by lightening, it was parked in the North 40 at OSH
all during the week and there were a few strong storms that passed near
the area. Heavy rain and strong winds were common and a few rumbles of
thunder. I don't camp at the airplane so I wouldn't know how it was at
that exact spot during the storms. As far
as I know now there are no common parts between the radios other than
the 240 audio panel. However, that should not inhibit the RX light on
the 540 even if it blocked the audio from coming through. Also, my with
was with me and we could always talk to each other - which was easy in
times of silent radios! Lastly, being a long
trip I brought an MP3 player and plugged it in through a music input
jack through the 540. The music never stopped playing (I pressed the
'music' button on the 240 so the music doesn't mute during radio
transmissions) so I know there wasn't a loss of all sound. Edited by M20Kid - 06 Aug 2018 at 8:22pm |
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tony ![]() Senior Member ![]() ![]() Joined: 06 Dec 2011 Location: Atlanta Status: Offline Points: 466 |
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Based on this statement: "Things were fine for a while and then the transmission stopped. The RX indicator on the 540 was not lit." I don't think its the audio panel.
Did your avionics guy, who did the install, wire up the interlock to mute the receivers in the other one is transmitting? If so, I would pull that wire out and see what happens.
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M20Kid ![]() Groupie ![]() Joined: 19 Aug 2015 Location: AZ Status: Offline Points: 79 |
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Tony, the install was done over a year ago with no issues until the last flight so I don't think it would be an incorrect wiring. If it were it would happen all the time. Like you I don't believe it could be the audio panel but I posted here because that's the only common piece between the two radios. Otherwise all systems are separate including antenna and wiring. Just strange to have them both act the same wrong way at the same time.
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tony ![]() Senior Member ![]() ![]() Joined: 06 Dec 2011 Location: Atlanta Status: Offline Points: 466 |
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I was thinking more of a chaffing wire to aircraft structure.
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MysticCobra ![]() Senior Member ![]() ![]() Joined: 29 Jan 2013 Status: Offline Points: 656 |
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tony ![]() Senior Member ![]() ![]() Joined: 06 Dec 2011 Location: Atlanta Status: Offline Points: 466 |
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You would see that on the audio panel that they were in TX mode. I'm talking about the receiver mute wire that you can add as an option; so when one radio transmits it mute the other receiver.
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AviSteve ![]() Admin Group ![]() ![]() Joined: 12 Feb 2018 Location: Melbourne, FL Status: Offline Points: 2205 |
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This topic has been closed as a duplicate of http://www.avidynelive.com/both-radios-go-quiet_topic1581.html. Please continue the conversation on that thread.
Edited by AviSteve - 09 Aug 2018 at 1:48pm |
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Steve Lindsley
Avidyne Engineering |
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