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Re: LF: Wellbrook RX loops

from [Roger Lapthorn] [Permanent Link][Original]
To: "[email protected]" <[email protected]>
Subject: Re: LF: Wellbrook RX loops
From: Roger Lapthorn <[email protected]>
Date: Fri, 5 Jul 2013 10:28:22 +0100
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Dave,

Thanks for that. Yes I can see the potential issue: you transfer the overload issue from the active antenna to the RX. A bandpass filter for each band is not hard though. Guess it is a question of whether the wideband/no tune approach is better/more flexible, than a tuned loop.

My current RX situation is not good on 136/472kHz and I am looking for a good solution on RX at the new QTH - moving in August all of 300m further east!

73s
Roger G3XBM


On 5 July 2013 08:27, DAVE PICK <[email protected]> wrote:
Roger

I have used a Wellbrook for many years on 136 and (now) on 472kHz. It performs well but it will put massive signals from broadcast stations into your RX! You may need a band-pass filter between the loop and the receiver. Obviously it is directional.
It will be around 10dB down on a proper aerial, but that's not a problem on LF.

Dave G3YXM


On 5 July 2013 08:00, Roger Lapthorn <[email protected]> wrote:
Can anyone advise, from actual use,  how well a Wellbrook loop works on 136 and 472kHz RX ? The excellent OIP2 and OIP3 figures and directivity suggest one could be very useful.

73s
Roger G3XBM




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