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EMS-220 Question (Read 908 times)
Mar 26th, 2018 at 8:15am

Mark Dickens   Offline
Junior Member

Posts: 59
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I have an older EMS-220 box and it has the flaw in it that causes the EGT/CHT readings to go off scale when I key my mic. I know I can get an warranty replacement, but its a real pain to get to and I want to explore any possible fixes without having dig it out.  My question is "can the ground wire (pin 3) act as an antenna if exposed to RF and generate these errors?". The ground wire is currently run in front of the firewall to a common ground collection point, but I could relatively easily re-route it behind the firewall to the same ground plane.  If this isn't what's causing the problem, then I'll have no choice but to dig it out, but I would love to avoid that hassle.
 
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Reply #1 - Mar 26th, 2018 at 8:42am

airguy   Offline
Senior Member
SkyView Flight Tester
Gods Country - west Texas

Gender: male
Posts: 347
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You could install a toroid on the power/ground to filter the high frequencies as well.

Mark Dickens wrote on Mar 26th, 2018 at 8:15am:
I have an older EMS-220 box and it has the flaw in it that causes the EGT/CHT readings to go off scale when I key my mic. I know I can get an warranty replacement, but its a real pain to get to and I want to explore any possible fixes without having dig it out. My question is "can the ground wire (pin 3) act as an antenna if exposed to RF and generate these errors?". The ground wire is currently run in front of the firewall to a common ground collection point, but I could relatively easily re-route it behind the firewall to the same ground plane. If this isn't what's causing the problem, then I'll have no choice but to dig it out, but I would love to avoid that hassle.

« Last Edit: Mar 26th, 2018 at 8:43am by airguy »  
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Reply #2 - Mar 26th, 2018 at 3:22pm

KRviator   Offline
Full Member
Sydney, Aust.

Posts: 127
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I'm not sure you would be entitled to a warranty replacement...Sounds like a relatively common installation issue that is permitting RF energy into the unit, something outside the control of Dynon.

One thing you may wish to try is grabbing some aluminium foil and wrapping it around the culprit comm coax and the relevant EGT/CHT probe wires to see if that is sufficient to stop the problem.

How far away are your CHT/EGT probe wires from your comm coax, and, how easy is it to replace your comm coax? Sounds like that might be a better solution than trying to get your EMS box out if it is in a bear of a spot.
« Last Edit: Mar 26th, 2018 at 3:23pm by KRviator »  
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Reply #3 - Mar 26th, 2018 at 5:54pm

Dynon Avionics   Offline
Dynon Official
Dynon Technical Support

Posts: 12966
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This is a known issue that was the result of a design deficiency, and we repair them even when out of warranty (this is rare these days, because we found the problem early in SkyView's life). There isn't a way to cure it in the field. If there were, we'd have people try such things before having them send them in.
« Last Edit: Mar 26th, 2018 at 5:56pm by Dynon Avionics »  

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Reply #4 - Mar 27th, 2018 at 4:30am

Mark Dickens   Offline
Junior Member

Posts: 59
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Dynon Avionics wrote on Mar 26th, 2018 at 5:54pm:
This is a known issue that was the result of a design deficiency, and we repair them even when out of warranty (this is rare these days, because we found the problem early in SkyView's life). There isn't a way to cure it in the field. If there were, we'd have people try such things before having them send them in.

I figured as much, but it doesn't hurt to ask...
 
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Reply #5 - Mar 27th, 2018 at 4:35pm

reidvaitor   Offline
Expert
SoCal

Posts: 612
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I had this issue as well during the troubleshooting era. Dynon was great to replace mine and it has worked flawlessly since.
replacing it was pretty simple from what I recalled.
One thing that remains at Dynon is the outstanding support team.
 
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Reply #6 - Mar 27th, 2018 at 6:26pm

wmince   Offline
Full Member
Clearwater, FL

Gender: male
Posts: 218
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reidvaitor wrote on Mar 27th, 2018 at 4:35pm:
Dynon was great to replace mine and it has worked flawlessly since.
Replacing it was pretty simple from what I recalled.
One thing that remains at Dynon is the outstanding support team.

Concur 100%.
When it comes to customer service and tech support, Dynon is stellar.
Absolutely the best in the industry.
That's why I keep coming back to their products. Cool
 
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