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  #1  
Old 11-05-2013, 08:09 AM
WingedFrog's Avatar
WingedFrog WingedFrog is offline
 
Join Date: Mar 2010
Location: Raleigh, NC
Posts: 863
Default Electromagnetic annoyance

Since the beginning I have a strong background noise when I push the PTT switch to talk. On the receiving side my signal is clear. An additional and likely related side effect is a surge on my EGT temperatures while the PTT is on. Interestingly if I want to focus with precision on a specific phase of a flight, I am using this side effect (i.e. 3 PTT pulses) to mark the diagrams I download for display at Savyanalysis .
I still want to fix this annoyance and would appreciate suggestions if someone faced this problem. FYI I have the Skyview with the adaptation harness. Another possibly related anomaly is that sometimes my EGTR runs crazy and ends-up with a big red cross on its display.
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Builder's name: Jean-Pierre Bernoux
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Kit # 120395 N124BX
Flying as of 9/11/2013

Builder's Blog:http://vieilleburette.blogspot.com/
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  #2  
Old 11-05-2013, 12:47 PM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
Default

Measure DC millivolts between battery negative and the transmitter case while pressing the PTT switch. It should be close to zero, 5 millivolt maximum. If too high, clean and tighten all connections. Also check engine ground wire.
Joe Gores
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  #3  
Old 11-05-2013, 01:20 PM
rich rich is offline
 
Join Date: Feb 2006
Location: Fort Worth, Tx
Posts: 180
Default Capacitive filter

I haven't used one but several VAFers say they work. It plugs in the back of the unit before the harness. You'll have to order the right male/female D-sub connector for the Skyview.

http://www.l-com.com/d-sub-capacitiv...25-male-female
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RV6A 2000 HRS.
Fort Worth,Tx.
Wright Brothers “Master Pilot” Award

Last edited by rich : 11-05-2013 at 01:34 PM. Reason: Forgot link
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  #4  
Old 11-05-2013, 04:16 PM
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WingedFrog WingedFrog is offline
 
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Location: Raleigh, NC
Posts: 863
Default

Thanks for the suggestions, Joe and Rich. Has anybody seen these EGT surges when pushing PTT? I suspect this is related to the background noise.
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Builder's name: Jean-Pierre Bernoux
Sport Pilot
Kit # 120395 N124BX
Flying as of 9/11/2013

Builder's Blog:http://vieilleburette.blogspot.com/
EAA 1114
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  #5  
Old 11-05-2013, 05:47 PM
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Bill_H Bill_H is offline
 
Join Date: Aug 2010
Location: Marshall TX (KASL)
Posts: 1,783
Default

Many add an extra ground from the engine right side to the same ground connection from the battery.
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  #6  
Old 11-05-2013, 07:22 PM
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Jetguy Jetguy is offline
 
Join Date: Aug 2008
Location: Texas, Fort Worth
Posts: 1,237
Default Yes!

Quote:
Has anybody seen these EGT surges when pushing PTT?
Yes. This is a known problem with the Skyview.
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John
RV12 N1212K
Flying Since June 2010
1020 Hours as of 9/30/2017
Johnrv12@icloud.com
RV14 Wing, arrived and building at Rdog's new Hanger at 16X
S/N 140014
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  #7  
Old 11-06-2013, 05:16 AM
todehnal todehnal is offline
 
Join Date: Jan 2005
Location: Kentucky Lakes area in KY
Posts: 947
Default

Quote:
Originally Posted by Bill_H View Post
Many add an extra ground from the engine right side to the same ground connection from the battery.
Hey Bill! Not sure I understand. How about a little more detail. I might just do that as a belt and suspenders approach myself,

Tom
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2013- RV12, Kit #119. N123M First flight Nov21. It's a keeper!
1998- RV-9 tail kit, built and sold
1989- RV-6 tail kit, built and sold
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  #8  
Old 11-06-2013, 02:19 PM
tfarrell839 tfarrell839 is offline
 
Join Date: Oct 2009
Location: Canby, OR
Posts: 53
Default Known issue?

When you say it is a known issue on the skyview, do you mean skyviews in general or just the RV-12 installations?
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  #9  
Old 11-06-2013, 04:54 PM
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Jetguy Jetguy is offline
 
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Location: Texas, Fort Worth
Posts: 1,237
Default

Quote:
When you say it is a known issue on the skyview, do you mean skyviews in general or just the RV-12 installations?
Can speak to the RV12 only!
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John
RV12 N1212K
Flying Since June 2010
1020 Hours as of 9/30/2017
Johnrv12@icloud.com
RV14 Wing, arrived and building at Rdog's new Hanger at 16X
S/N 140014
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  #10  
Old 11-06-2013, 05:12 PM
9Driver 9Driver is offline
 
Join Date: Dec 2006
Location: Fernandina Beach, FL
Posts: 61
Default

I have the skyview installation, not the conversion, and encountered the same egt rise when testing radio and pressing the PTT. Contacted Dynon and was told it was a known problem. Mine was still under warrantee, so after emailing them with info they requested, I received an RMA number, returned for repair (no charge). Since receiving and reinstalling I have had no more problems.
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