Hi Mike
The K9AY antenna would meet your requirement for a broad front and a
"steep" null. Although the original design was not intended to
be rotational, the use of two loops at right angles as per Gary Breed's
QST article provides four instantly switchable directions.
However it would not be impossible to make a single loop rotational
but probably more trouble than it is worth when compared with the two
loop option.
Regards
Tracey G5VU
-----Original Message-----
From: Mike Dennison <[email protected]>
To: [email protected] <[email protected]>
Date: 1999 Jun 16 09:53
Subject: Re: LF: DSP?
I suspect that the way forward with LF reception is with a very
narrow-band, highly directional rotatable receive antenna with broad
front and steep null. This will allow the reduction of amateur QRM,
electrical noise, and blocking by commercial signals. Interestingly,
when I built an amplified ferrite rod receive antenna for 73kHz it had
a much narrower bandwidth (few hundred Hz) and sharper null than
my 1m loop antenna - but the loop received better!
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