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

GHP@TrustedWealthAdvisors.com

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