Mailing List lml@lancaironline.net Message #51884
From: terrence o'neill <troneill@charter.net>
Sender: <marv@lancaironline.net>
Subject: Re: [LML] Re: interference?
Date: Mon, 22 Jun 2009 22:52:31 -0400
To: <lml@lancaironline.net>
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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