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  #1  
Old 07-27-2018, 03:00 PM
RV8iator's Avatar
RV8iator RV8iator is offline
 
Join Date: Nov 2006
Location: Saint Simons Island , GA
Posts: 1,393
Default Weak transmission from both radio..

I have a GTN 650 and GTR200 working through a PMA450 audio panel. Indvidual bent whip antennas on belly.
When I transmit from front cockpit on either radio, air or ground, transmission is weak and muffled. Have tried 3 headsets, all the same.
From the rear cockpit all is normal.
My reasoning is since it all works from the back as advertised that I must have an issue with the front mic jack or another ground issue up front.
PMA doesnít have individual output controls. Works great frm rear cockpit.
Iím going to pull the audio panel and check the mic jack barrells for good grounding. If thatís good, whatís next.

Where else should I check?
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Jerry "Widget" Morris
RV 8, N8JL, 2700+ hours

VAF #818
Saint Simons Island, GA. KSSI
PIF 2008, 2009, 2010, 2011,2012, 2013, 2014, 2015, 2016, 2017, 2018.

I just wish I could afford to live the way I do
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  #2  
Old 07-27-2018, 08:37 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 5,355
Default

Does the intercom work okay from the front seat? If no, pull the input pins and swap front and back seat inputs. (Back pins to front inputs). If the rear seat now has the issue, the problem is in the audio panel. If the problem stays with the front, look hard at the wiring.
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  #3  
Old 07-27-2018, 08:49 PM
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RV8iator RV8iator is offline
 
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Location: Saint Simons Island , GA
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Default

Intercom works perfect from the front seat,
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Jerry "Widget" Morris
RV 8, N8JL, 2700+ hours

VAF #818
Saint Simons Island, GA. KSSI
PIF 2008, 2009, 2010, 2011,2012, 2013, 2014, 2015, 2016, 2017, 2018.

I just wish I could afford to live the way I do
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  #4  
Old 07-28-2018, 11:14 AM
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RV8iator RV8iator is offline
 
Join Date: Nov 2006
Location: Saint Simons Island , GA
Posts: 1,393
Default Close this one out for now.

Well, I took out the forward mic jack and put in new isolation washers and also removed a heavy duty mic muff from my headset. One of them fixed it. Iím guessing the mike jack was groundng out enough to interfere with the transmission. Gremlins....
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Jerry "Widget" Morris
RV 8, N8JL, 2700+ hours

VAF #818
Saint Simons Island, GA. KSSI
PIF 2008, 2009, 2010, 2011,2012, 2013, 2014, 2015, 2016, 2017, 2018.

I just wish I could afford to live the way I do
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  #5  
Old 07-28-2018, 07:08 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 5,355
Default

Yet it always worked with the intercom. Strange gremlin indeed.
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