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  #1  
Old 12-04-2019, 09:01 PM
wnplt wnplt is offline
 
Join Date: Feb 2013
Location: Idaho
Posts: 144
Default Strange GTN 650 Issue

So I was flying a couple ILS approaches today and on the second one the GTX 650 would not transmit to ATC. The GMA245 audio panel mic switch light flashed as it was transmitting but no TX indication above the Freq on the GTN, had to switch to com 2 and that was working. I tried rebooting the GTN and the audio panel but still could not get GTN to transmit. It was receiving fine. I decided to fly back to home base and tried it again and the TX annunciated this time and was transmitting again. Radio has been flawless since July. Thought maybe a broken wire or pin issue but it failed and then 10 minutes later was working again and could not duplicate. Not sure if itís the audio panel not keying the GTN or the GTN just not transmitting. Thinking if it does it again to power off audio panel so to force failsafe and see if the GTN transmits. Anyone have any ideas? Steve do you have any ideas?

Thanks,
Steve
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  #2  
Old 12-04-2019, 09:40 PM
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RV8iator RV8iator is offline
 
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Location: Saint Simons Island , GA
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I would make sure it is seated and tight in the rack. Donít overtighten the allan screw, just snug.
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  #3  
Old 12-05-2019, 06:59 AM
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rleffler rleffler is offline
 
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I had a similar issue with my 650. Mine turned out to be the PTT switch going bad.

As an intermittent issue, they are tough to isolate. Remember, when you're flying there a lot of vibrations, that aren't present on the ground. Put an ohm meter the the wires and shake them to see if there are any connections that may not be solid.
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  #4  
Old 12-05-2019, 07:21 AM
Tim Lewis Tim Lewis is offline
 
Join Date: Aug 2006
Location: Bristow, VA
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I had a similar experience with a 530W. Turning off/on with power switch didnít fix it, but pulling *both* breakers and rebooting did resolve it.
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  #5  
Old 12-05-2019, 07:21 AM
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Walt Walt is offline
 
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If you're not getting the TX indication on the 650 I would start looking at the key line from the 245 to the 650.
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  #6  
Old 12-17-2019, 08:43 PM
wnplt wnplt is offline
 
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Location: Idaho
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Thanks guys... this was a tough one to troubleshoot but it did turn out to be a cold solder sleeve that spliced the mic key and the TX interlock lead to the com 2.
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  #7  
Old 12-18-2019, 08:18 AM
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Walt Walt is offline
 
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Quote:
Originally Posted by wnplt View Post
Thanks guys... this was a tough one to troubleshoot but it did turn out to be a cold solder sleeve that spliced the mic key and the TX interlock lead to the com 2.
This has been hashed around in the past but this is a good example of why I would never use a solder sleeve for a splice, solder sleeves were designed to be used as shielded cable terminations not wire splices.
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Walt Aronow, DFW, TX (52F)

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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  #8  
Old 12-18-2019, 09:46 PM
wnplt wnplt is offline
 
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Good to know! Thanks...
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  #9  
Old 12-19-2019, 10:52 AM
romaja romaja is offline
 
Join Date: Jan 2016
Location: Vancouver, Washington
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Quote:
Originally Posted by Walt View Post
This has been hashed around in the past but this is a good example of why I would never use a solder sleeve for a splice, solder sleeves were designed to be used as shielded cable terminations not wire splices.
What type of splice do you recommend for the smaller gauge wires? Crimp type?
Thanks
Jim
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  #10  
Old 12-19-2019, 01:10 PM
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Walt Walt is offline
 
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Quote:
Originally Posted by romaja View Post
What type of splice do you recommend for the smaller gauge wires? Crimp type?
Thanks
Jim
AMP PIDG used with an AMP crimper is my go to, never had one fail yet.
Hand solder with double wall adhesive shrink is #2.
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Walt Aronow, DFW, TX (52F)

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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