receiver antenna placement

[Gray E Fowler]

AM?  what happens ? Do you accidentally receive talk radio?



Gray Fowler
Principal Chemical Engineer
Composites Engineering




Bill Glaze <billglaze at triad.rr.com>
Sent by: discussion-request at nsrca.org
02/25/2004 01:29 PM
Please respond to discussion

 
        To:     discussion at nsrca.org
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        Subject:        Re: receiver antenna placement


Earl:
I find that extremely interesting.  The only radio I've had to run a 
bonding wire with was my first one, a Babcock 3 channel ca. 1954.  They 
wanted everything bonded, from the rudder control wire, rudder/throttle 
exscapements, servo case, etc.
up to and including the engine.  Every piece of metal on the airplane, 
including the landing gear.  What a pain!  It was, of course, AM.

Bill Glaze

EHaury at aol.com wrote:
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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