[Premium-Rx] Antenna question

[GandalfG8 at aol.com]

Hi Michael
 
I'm quite a fan of Wellbrook too, with a couple of 1530s waiting to go  
outside again and currently a 5030 mounted on a rotator in the loft.
 
Just out of interest, and with reference to Jack's comment earlier, have  
you investigated where your loop starts to lose its directivity?
 
I've used the loft mounted 5030 in two locations, first within 30  miles of 
London and now out on the west coast of Scotland, with neither  location 
offering any significant nearby metallic reflectors, and my  impression has 
always been that they start to lose directivity towards the  top end of Medium 
Wave anyway.
That's not meant to imply any criticism of Wellbrook, I've used other  
active loops that exhibit similar performance, but just wondered if that was the 
 norm?
 
Regards
 
Nigel
GM8PZR
 
 
 
In a message dated 13/11/2012 22:15:12 GMT Standard Time,  
michaelob666 at ntlworld.com writes:


Gents

A propos John's offering tonight, I have a  Wellbrook Loop mounted three 
floors up on the roof and I can attest to its  excellence right down to 
VLF. 
If it does intermodulate, it certainly does  not show it.

By way of example the strongest station here on LW is  Radio 4 on 198 kHz 
which booms in at around 10 - 15mV PD, and Radio 5 Live  is a litle 
stronger 
on 909kHz, yet weak signals just 9kHz away are not  affected.

It picks up less absolute RF than a long wire but a hell of a  lot less 
noise, so the S+n/n is excellent.

The Loop also exhibits  about 30dB directivity when exactly broadside and 
that is useful if you  mount it on a rotator.

73s
Michael
G8MOB

----- Original  Message ----- 
From: "John Wilson" <johnwilson at freezone.co.uk>
To:  "'Al Klase'" <ark at ar88.net>; <premium-rx at mailman.qth.net>
Sent:  Tuesday, November 13, 2012 7:23 PM
Subject: Re: [Premium-Rx] Antenna  question


> Well said, see my articles on the Wellbrook loop  antenna. Out-performs 
any
> long wires.
> John Wilson
>  G3PCY
>

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