From: Chris Zavatson
[mailto:chris_zavatson@yahoo.com]
Sent: Tuesday, March 10, 2009 9:37
PM
To: lml@lancaironline.net
Subject: Re: [LML] Re: TruTrak
autopliot and RF
<<Are people using a common ground wire for the radio
PTT and any Auto Pilot
switches ? ... If so did you try to run separate grounds ? >>
I have used separate ground lines for each system.
I did some testing this weekend.
I checked the impedance between ground bus, avionics racks,
instrument panel and the autopilot case. -all check out good as a dead
short.
It is the #2 antenna (bent wip mounted to an aluminum
platform in the tail cone) has a big impact on the auto pilot. The #1
antenna (Bob Archer in the vertical stab) has a small, barely perceptible
impact if tested on the ground. Physically moving the #2 antenna
from the tail cone to outside near the passenger side wing tip eliminates its
interference with the autopilot completely. With the #2 antenna removed,
the #1 antenna now becomes the source of strong interference with the
autopilot.
still scratching my head....