[Top] [All Lists]

Re: [RFI] LF noise

To: n6pe@yahoo.com,RFI@contesting.com
Subject: Re: [RFI] LF noise
From: Missouri Guy <n0tt1@juno.com>
Date: Sun, 20 Dec 2009 17:21:22 +0000
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
> I've seen blogs that shielding a loop really doesn't do much.

Rick, that's because the "shield" is part of the antenna.
You can prove that to yourself by grasping a resonant loop, say,
on it's side (assuming it's gap is at the top) and noticing that
the resonance has changed frequency.
> With high local line noise, is a TUNED LOOP or non-resonant receiving
loop antenna a >better option? 
For line noise or local signals, either loop should have the same
directivity.  A tuned
(resonant) loop will have a higher "Q" and attenuate both signals and
noise that
are away from its resonant frequency....useful when you want to
reduce strong out-of-band signals or noise.  A non-resonant loop
will be quite broad-banded and have less output....useful when you
want to receive signals and noise over a broad frequency range without
having to re-tune the loop.
Charlie, N0TT
RFI mailing list

<Prev in Thread] Current Thread [Next in Thread>