Thanks, Pete.
This weekend I found that my headset jacks, that I moved to the panel at the last minute, were not insulated. I was hopeful I had found the issue. Not. Next is the audio jack in and other misc. items that contact the panel, and running a dedicated ground line to my antenna ground plane. A local A&P suggested that I ground the panel itself as well. Frustrating.
I was able to isolate the squelch noise to the "EFIS-trim:" circuit while idling today. Not sure what that means, but will reach out to Aerotronics, who did my panel, this week.
Will keep the group posted..
Gordon
Gordon H. Porter
Managing Partner
Trusted Wealth Advisors, LLP
Registered Principal, Cambridge Investment Research, Inc.
800-290-2632 717-757-4908 fax 717-843-0180
Securities offered through Cambridge Investment Research, Inc.. Member FINRA/SIPC. Advisory Services offered through Cambridge Investment Research Advisors, Inc., a Registered Investment Advisor. Tax services are offered by Trusted Wealth Advisors LLP. Trusted Wealth Advisors and the Cambridge Investment Research companies are unaffiliated entities.
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I had similar problems with my ES comm. In my case I found two causes. The first was the aux audio input jack for my comm panel. It was mounted on the aluminum dash, which created a ground loop as the barrel of the connector was then connected by both a wire and the panel. Disconnecting the jack eliminated the hum. Note that the hum was there even when the aux jack was not enabled – just its presence created a ground loop.
The second issue was noise emanating from my LED position lights. This noise only affected the lower comm frequencies, while the aux jack loop created a buzz all of the time. You can source these kinds of problems by opening the fuses one by one until the problem goes away.
I had very similar experience with my ES. I tried the alternator filter capacitor idea with no luck too. I could eliminate the noise by turning off the alternator field. Turned out to be a ground loop due to the aluminum headphone mounting jack plates for the rear seat passengers. I installed plastic washers with a flange so that the jack bodies wouldn't touch the metal plate. Aircraft Spruce sells them just for this purpose. Originally I had plastic washers that didn't have the flange that keeps the jacks in the center of the hole. No more whining in my plane except from some passengers when there is turbulence!
Fairfield, CA
Sent from my iPad
Well, I have been flying my Lancair ES for 90 hours and loving it. Knocking off the last of the minor squawks. One that has me perplexed is a very staticy COM background noise:
Get it on both radios - a G530 and an SL30, on different antennae
SL 30 is on an exterior Comant 121; G530 is on a bonded in AAE in vertical
My transmissions are heard fine
I actually here incoming transmissions when it is staticy fairly well, most of the time
The WEIRD part is it is 100% reproducible on 118.xx, 119.xx and 120.xx freqs only. Rest of freq spectrum is crystal clear with good range
I thought I had it narrowed down to the Primary ALT since at 8-900 RPM I could switch the static off and on with the field switch. So, I put one of those big capacitors (from B&C) on the PRIM ALT. No improvement at higher RPMs. Noise is the same with either alternator.
Any ideas? The lower freqs only has to be a clue, I just don't know what it means!!
Thanks in advance for any ideas or direction.
Gordon
Lancair ES N144GP
IO-550
Gordon H. Porter
Managing Partner
Trusted Wealth Advisors, LLP
Registered Principal, Cambridge Investment Research, Inc.
800-290-2632 717-757-4908 fax 717-843-0180
Securities offered through Cambridge Investment Research, Inc.. Member FINRA/SIPC. Advisory Services offered through Cambridge Investment Research Advisors, Inc., a Registered Investment Advisor. Tax services are offered by Trusted Wealth Advisors LLP. Trusted Wealth Advisors and the Cambridge Investment Research companies are unaffiliated entities.
Trading instructions sent via e-mail may not be honored. Please call our office, or Cambridge Investment Research trading desk at 800-756-8115
, for all buy/sell orders. Please be advised that communications regarding trades in your account are for informational purposes only. You should continue to rely on confirmations and statements received from the custodian(s) of your assets. The text of this communication is confidential, and use by any person who is not the intended recipient is prohibited. Any person who receives this communication in error is requested to immediately destroy the text of this communication without copying or further dissemination. Your cooperation is appreciated.