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Re: LF: RE: Diversity

To: "rsgb_lf_group" <[email protected]>
Subject: Re: LF: RE: Diversity
From: "Dave Sergeant" <[email protected]>
Date: Sun, 3 Mar 2002 09:07:33 -0000
References: <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: <[email protected]>
From Dave G3YMC
G3KEV wrote:
Maybe your friends are transmitting on full size loops.
Let me know how you get on and try a vertical as well for comparison.
As one of those 'friends' perhaps I should comment!

Mal will presumably expect his large 'normal' antenna to outperform a loop at 
the
same location unless it is very large, as he has a very large site and can 
erect big
antennas.  I have a very small site, well shielded with poor ground conditions. 
 My
loop is a means to get on the band where I would not otherwise be able to do 
so, and
to be realistic I do not expect big results from my qth whatever I do.  I have
recently done comparitive tests with a 10m top loaded vertical, the best I can
sensibly achieve, and there is certainly not the huge improvement Mal suggests.
Details of these tests are on my website at
http://www.dsergeant.btinternet.co.uk/vertical.htm.

It may be that the vertical is not optimised, and in anycase is difficult to get
clear of vegetation etc - the very problem Bill Ashlock in the USA has which he 
has
overcome with loops. There are some signals which I can hear better on the 
vertical,
but they are few and generally in the direction of the loop nulls, and in a 
typical
urban location local noise normally makes the loop the best all round antenna.  
No
big expectations of dx here - if Mal can only just hear me he should remember 
it is
325km and no mean distance for my set up.  It may be a compromise, and 
certainly does
not perform like some setups do, but the loop does at least get me on the air 
from a
difficult qth.

I am currently building an Elecraft K2 10W hf transceiver.  When that is 
complete
shortly I shall devoting far more time to the hf bands.  With normal cw 
activity on
136 at an all time low I can no longer devote all my time to that.

73s Dave G3YMC
[email protected]
[email protected]
http://www.dsergeant.btinternet.co.uk






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