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  #11  
Old 07-31-2020, 08:32 PM
ian greenland ian greenland is offline
 
Join Date: Jul 2013
Location: goondiwindi qld australia
Posts: 3
Default Voltage Drop maybe

I would check the voltage drop from the Battery; Master Sol and Bus bar and then to the AP unit and other maybe shared connections, Use a Multi meter that’s reads Min and Max hold option, If for example the Voltage at the Master solenoid has little or no drop but at the AP unit power input has significant drop say to 9 volt the problem is between the Master Sol and AP and Manifold and maybe other connections. Do this test with all power on in running config and key the mic at each point of the test. Hope this helps
Ian. Rv 9 Australia
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  #12  
Old 08-01-2020, 07:23 AM
DGlaeser DGlaeser is offline
 
Join Date: May 2005
Location: Rochester Hills, MI
Posts: 879
Default

Quote:
Originally Posted by ColoradoSolar View Post
Seems strange that the PTT would be the problem as it is just a switch to connect a pin to ground, no real signal.
I agree that it is strange, and I was very skeptical, but I was also amazed at the difference it made. Somebody more versed in RF than I would have to explain it
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Dennis Glaeser CFII
Rochester Hills, MI
RV-7A - Eggenfellner H6, GRT Sport ES, EIS4000, 300XL, SL30, TT Gemini, PMA6000, AK950L, GT320,
uAvionixEcho ADSB in/out with GRT Safe Fly GPS
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  #13  
Old 08-01-2020, 10:06 AM
andrewtac andrewtac is offline
 
Join Date: May 2014
Location: Friendswood TX
Posts: 218
Default

When I put in my GTN635, my help incorrectly wired the bnc connections. They stripped the shielding to far (didn't butt up against the connection) and when I keyed the mic I had similar issues (afs4500 engine indications went crazy) also lost GPS reception. It was an RF issue. I would bet you have some leakage somewhere anything unshielded is getting blasted. I did some Google searches and figured out how to test coax and made new connections, no more issues.
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