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Tom,
The comm coax is
probably old RG58 ... OD is .187". It runs right under (about 4 inches)
the AHRS, and is no closer than about 3 ft. to the magnetometer, which is
on the other side of the fuselage.
I bought the project (kit #11)
with the antennae coax leads already in it. I could probably splice
the RG58's front part into RG400... can't reach very far back into the
tailcone.
(This design was not refined
for easy maintenance.)
I'll check to see if the two
coax run close together anywhere.
And will check to see if I used
shielded wire to the magnetometer and AHRS.
All seems to work fine until I
transmit.
Many thanks.
Terrence O'Neill
----- Original Message -----
Sent: Monday, June 22, 2009 09:58
Subject: [LML] Re: interference?
Terrence,
I would keep the comm coax as far from the
magnetometer as possible. In addition make sure you're using quality
coax, RG400 or better. Don't use RG58. I would also use shielded
wire to run power and gnd to the magnetometer and ARHS. The nav coax
shouldn't be a problem, it's only function is to carry very small signals
from the antenna, but if it's running close to the comm coax I suppose the two
could be coupling, in which case having the nav coax close to the
magnetometer might be an issue.
Tom Gourley
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