receiver antenna placement

[Dean Pappas]

Thank You Earl,
For a long time I've harbored the notion that leaving the rudder cable wires, and the like, ungrounded was a source of problems for those that have them. I've never done the experiment, 'cause I haven't had the problem. I do run my antennas in a tube that is run up at the very top of the fuse, and up the L.E. of the fin: steel rudder cables, carbon elevator rods and all.
Regards,
    Dean

-----Original Message-----
From: EHaury at aol.com [mailto:EHaury at aol.com]
Sent: Wednesday, February 25, 2004 11:02 AM
To: discussion at nsrca.org
Subject: Re: receiver antenna placement


Wayne
 
I've no experience with the full carbon fuse - antenna issue. However, a few years ago I experienced all sorts of range / glitching problems in an airplane that had metallic paint, metal cables and other potential points of metal - metal contacts (landing gear, landing gear door mechanisms, etc.) Running the antenna through a wing helped a bunch, as it moved the antenna away from noise generators. The real fix was to wire all metal objects together with a "ground wire" that was connected to the negative battery lead. Antenna then worked fine inside the fuse. All this was with an AM receiver on 6-meters. 
 
A similar experience occurred with a different airplane that had a small fuselage and a lot of servo leads near a good portion of the antenna, range was nonexistent until moving the antenna to the wing. In this case the receiver was single conversion FM on 6-meters.
 
My conclusions were that the metallic paint is not a problem, metal to metal generated noise is (at lease with AM), and antenna - servo lead proximity can be. 
 
I've not had any problems with dual-conversion FM on 6-meters with the antenna inside or outside the fuse, although I maintain a couple of inches separation between servo leads - cables and the antenna. 
 
Current flights with the Partner haven't demonstrated any issues with the antenna inside the Kevlar rear of the fuse (as expected), although I've flown head on trimming stuff that has put the carbon front of the fuse between the antennae.
 
Earl

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