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11-05-2013, 08:09 AM
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Join Date: Mar 2010
Location: Raleigh, NC
Posts: 863
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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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11-05-2013, 12:47 PM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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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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11-05-2013, 01:20 PM
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Join Date: Feb 2006
Location: Fort Worth, Tx
Posts: 180
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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
__________________
Rich Rudolph
VAF#007
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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11-05-2013, 04:16 PM
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Join Date: Mar 2010
Location: Raleigh, NC
Posts: 863
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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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11-05-2013, 05:47 PM
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Join Date: Aug 2010
Location: Marshall TX (KASL)
Posts: 1,783
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Many add an extra ground from the engine right side to the same ground connection from the battery.
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11-05-2013, 07:22 PM
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Join Date: Aug 2008
Location: Texas, Fort Worth
Posts: 1,237
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Yes!
Quote:
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Has anybody seen these EGT surges when pushing PTT?
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Yes. This is a known problem with the Skyview. 
__________________
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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11-06-2013, 05:16 AM
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Join Date: Jan 2005
Location: Kentucky Lakes area in KY
Posts: 947
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Quote:
Originally Posted by Bill_H
Many add an extra ground from the engine right side to the same ground connection from the battery.
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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
__________________
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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11-06-2013, 02:19 PM
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Join Date: Oct 2009
Location: Canby, OR
Posts: 53
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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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11-06-2013, 04:54 PM
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Join Date: Aug 2008
Location: Texas, Fort Worth
Posts: 1,237
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Quote:
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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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Can speak to the RV12 only! 
__________________
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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11-06-2013, 05:12 PM
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Join Date: Dec 2006
Location: Fernandina Beach, FL
Posts: 61
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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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