receiver antenna placement
John Ferrell
johnferrell at earthlink.net
Wed Feb 25 12:56:05 AKST 2004
Naw..... it is antique modulation....
John Ferrell
http://DixieNC.US
----- Original Message -----
From: Bill Glaze
To: discussion at nsrca.org
Sent: Wednesday, February 25, 2004 4:42 PM
Subject: Re: receiver antenna placement
Nah.............It means amplitude modulation.................you've probably never heard of it before. It was first used in Walkie Talkies by Fred Flinstone and Barney Rubble.
Bill G.
Gray E Fowler wrote:
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
cc:
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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