REFLECTOR: Blue Mountain Mag Swing on Broadcast

[Craig and Denise Woolston]

Similar but different.  Definitely agree with Scott it's more likely related
to the antenna on the COM then the BM.  We had a problem with our GRT EIS,
all the CHTs would drop 150 degrees when we keyed the mic.  Turned out the
com antenna bnc, was not fully engaged.  Re-seated it, problem solved (took
2 months of troubleshooting though).

Craig


-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of reflector at velocityxl.com
Sent: Friday, November 30, 2007 8:38 AM
To: reflector at tvbf.org
Subject: REFLECTOR: Blue Mountain Mag Swing on Broadcast

Has anybody solved an issue with thier EFIS mag heading swing when they
broadcast
 
I've got a XL and BMA Gen 3 EFIS/1.  I've worked pretty hard to get the
heading accurate (including moving it from the nose/canard area to the
strake where there's no metal aside from the wing bolts, which are about a
foot away, where the com coax runs through to the winglet), but now I find
that when taxing around the airport, if I broadcast the mag swings way to
one side, and then returns when I unkey the mic. How irratating. Anyway, I
ran shielded wire to the mag, which I think is unterminated on the mag end,
and terminated on the EFIS end, but I'll have to check. Thoughts?
 
Also, the strobe wires run through the same area, but don't seem to affect
mag heading.
 
Brett
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