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01-20-2016, 12:16 PM
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Join Date: Apr 2015
Location: The Woodlands, TX
Posts: 37
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Another possibility, though unusual, is the avionic bus voltage being lowered to the point of not transmitting when the ptt is pressed (the radio will draw more current when trying to transmit). I experienced this on my RV due to a bad, high resistance, avionics master switch. It took some time for me to discover.
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01-20-2016, 12:20 PM
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Join Date: May 2006
Location: Pocahontas MS
Posts: 3,884
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If you do have to dive under the panel, you might consider adding a pair of radio-only headphone/mic jacks somewhere you can reach them in flight. That way you can bypass any intercom/audio panel issues, if needed.
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01-20-2016, 12:24 PM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Simple tests first
The other simple test is to turn the PS7000 to OFF.
This is the failsafe mode that connects the pilot headset directly to COM 1.
If that lets you transmit it isolates the problem to the intercom.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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01-20-2016, 04:12 PM
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Join Date: Jul 2014
Location: Nags Head NC.
Posts: 206
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And I have yet to figure out my recieve but won't transmit issue ,only when Nav lights on. The radio stuff can be tricky.
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A C Tyler
RV 9A
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01-20-2016, 07:57 PM
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Join Date: Nov 2007
Location: Waller, Texas
Posts: 146
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Electrical issues that defy the laws of physics are usually a bad ground somewhere.
__________________
Phil Birkelbach
RV-7 727WB - Flying
Pitts S1C - Restoration
Christavia Mk1 - Fuselage
www.myrv7.com
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01-20-2016, 09:11 PM
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Join Date: Jul 2007
Location: Wray, Co
Posts: 584
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Fixed?
Took the 327 from the tray, cleaned the contacts with electronic cleaner and reinstalled. Flew for 30 minutes without any problems, talked to several pilots who received my transmission fine. Cross my fingers.
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01-20-2016, 10:29 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,767
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Quote:
Originally Posted by rwarre
Took the 327 from the tray, cleaned the contacts with electronic cleaner and reinstalled. Flew for 30 minutes without any problems, talked to several pilots who received my transmission fine. Cross my fingers.
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Are you saying pulling the transponder fixed your com radio problem? |
01-21-2016, 06:45 AM
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Join Date: Jul 2007
Location: Wray, Co
Posts: 584
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yes
I pulled the audio panel from the tray not the transponder.
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01-21-2016, 09:58 AM
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Join Date: May 2006
Location: Pocahontas MS
Posts: 3,884
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Yeah, those edge connectors pretty much define 'certified aviation quality'. They really are the 1st place to look when you have an audio or comm problem.
Charlie
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01-22-2016, 02:41 PM
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Join Date: Jul 2007
Location: Wray, Co
Posts: 584
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Lesson learned
I solved the faulty radio transmission problem and kick my self for poor judgement. I remember when working until the panel with the ADS-B installation that one of my ground crimps didn't feel right even though I did a pull test. I double checked several crimps and sure enough the audio panel ground was loose and came right out of the connector. Even though I have used my crimper for the whole build of my rv, I have decided to invest in a better crimper.
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