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  #91  
Old 03-15-2017, 11:20 AM
AirHound AirHound is offline
 
Join Date: Oct 2006
Location: OFallon IL now, everywhere before
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Originally Posted by Mich48041 View Post
Check the transponder antenna mounting to be sure it is grounded.
Check the voltage regulator case ground and battery negative ground. There should not be any paint on the sheet metal that could interfere with current flow.
Joe, PTT causes EGT spike. I noticed the amount of spike relates to what frequency is being transmitted on. The higher the freq the hire the spike. Also dynon indicated my ems serial number is one which was sensitive to RF interference And to send it in for upgrade. I havent had the opportunity to do the prescribed panel continuity check, but will. Does the above situation ring any bells?
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  #92  
Old 03-15-2017, 12:01 PM
Mich48041 Mich48041 is offline
 
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No bells. I am not familiar with the Dynon EMS RF sensitivity problem. Keep us posted on the situation.
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  #93  
Old 03-29-2017, 09:39 AM
AirHound AirHound is offline
 
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Originally Posted by Mich48041 View Post
Mauritz,
The SL40 has a built-in intercom. Perhaps that function was turned on before adjusting the sidetone, and now the SL40 intercom function is shut off.
Although I have never tried it, the Flightcom 403 intercom should work with the radio shut off. So with the radio shut off, can you still hear yourself talk? Can the passenger hear himself talk? I tell my passengers to keep the microphone close enough to kiss. And if they can not hear themselves talk, then neither can I.
Does the intercom break squelch when the knob is turned clockwise?
Is the intercom switch up in the ICS position?
Are both headsets stereo?
Have you tried other headsets?
The intercom works best when both headsets are the same brand and model.
Joe,
Should one or the other IC capability be turned off and not both be on?
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  #94  
Old 03-29-2017, 09:45 AM
AirHound AirHound is offline
 
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Location: OFallon IL now, everywhere before
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Originally Posted by Cannon View Post
We were chasing this very issue for the last several weeks (Skyview/Flightcom 403/SL40).

First I tried pulling pins 18 & 19 from the intercom connector, which worked besutifully until it became evident that this also disabled all of the Dynon aural alerts.

I spent a bit of time looking through wiring diagrams until I stumbled upon the page describing the initial Dynon audio setup. Eureka! Spent an hour or so fine tuning the EFIS (L) and EFIS (R) pots on the side of the AV5000, and I'm quite happy with the result.

The book actually has you practice adjusting the pots using an iPod connected to the aux input to get a feel for adjusting them before adjusting the EFIS L&R pots.

The manual specifically mentions the noise generated but the Skyview, and how we need to turn down the EFIS audio pots on the AV5000 until we can hear the aural alerts, but not the background noise. The pots have a 25 turn range, so finding the sweet spot took some time. Eventually, I gave up and turned the pots fully CW until they bottomed, and worked them out 1 turn at a time until I had audio again. The rest of the time was spent fine tuning them so I had the same volume in each ear (I had to flip a dip switch to get stereo audio in my headset. Once done, I went back to mono, as I use the headset in other airplanes that aren't wired for stereo audio).

Getting at the pots is a bit of a challenge,and I had to pull the glare shield to gain access. They're located on the right side of the AV5000. One could pull the screen instead, but you'd have to reconnect it every time to check the audio levels. I had to adjust the pots by feel, but it's doable, if not necessarily easy.

Now I can fine tune the Dynon alerts in the software and have essentially no background noise in the headsets.

Hope this helps someone.
I would like to raise the volume of the EFIS alerts (a tad), my SV setting is at 100%. I have the avionics bay open, should I use my iPhone aux music to test EFIS pot adjustments checking for increased volume as I turn the pot or are adjustments more problematic than just turning the pot screws in or out? Thank you!
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