Buly,

I would bet you found the problem. DC power leads should always be run
as a pair. A nice uniform twist is also good but I do not remember how
many twist per foot is recommend. Bobby -----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Bulent Aliev
Sent: Wednesday, February 15, 2006 9:09 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Radio noise saga

Just came back from the hangar. My hangar neighbor is a electrical
engineer and was helping me. Tried few things:
Checked all the pinouts on the RST AP and everything was fine Powered
the AP and radio with a separate battery independent from the planes +
and- : No change Installed the 20A Radio Shack filter Bob Nuckols
recommended: No change BTW Radio Shack has discontinued all the noise
suppressors that we can use. I found one left over.
Than I checked with my handheld and my headset inside the cockpit. No
connections of any kind to the plane. With squelch on high gain, I can
hear all the noises. Than it hit me: there is an antenna radiating all
the noises. Bob Nuckols warned against use of wire conduits in both side
of the plane.

When I moved the batteries to the nose from the spar a month ago, I run
two #2 wires the whole length of the fuselage to the firewall.  Being nervous having positive and neg. in the same conduit, I run one in
each side.
So, I think I created a very good antenna.
I have a long HD battery jumper cable ready to test instead of both
cables in place now, but I got hungry and tired and left it for
tomorrow.

Buly




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