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Date: Sun, 1 Feb 2009 19:03:52 +0000
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From: Andy Talbot <andy.g4jnt@googlemail.com>
To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Re: 'JNT WSPR
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Yes, I saw that double listing as well, just as I broke off to listen
to G0NBD's Olivia signal. Just about to return to WSPR, see if that
freq jump can be triggerred.
Andy G4JNT
www.g4jnt.com
2009/2/1 James Moritz <james.moritz@btopenworld.com>:
> Dear Andy, LF Group,
>
> Should be better now - I have been playing with antennas due to the problem
> that arose yesterday with the increased noise levels. Incidentally, I just
> saw your frequency jump from 503870 to 503885 Hz in the middle of the 1830
> transmission, but still gave 0dB and +3dB SNRs - on two frequencies!
>
> After going out and about with a loop and portable RX, I am now pretty
> certain that the QRM is being radiated from the Brookmans Park transmitter
> site. I am not entirely certain, but there seems to be some correlation
> between the noise and the BBC R5 909kHz transmission audio, the antenna of
> which is about 500m from here. This was also the case before, but the QRM
> level has risen by about 20dB in the last day or so.
>
> As an experiment, I have lashed up an EWE-like antenna, and with suitable
> tweaking this gives about 20dB of unidirectional null, which has brought me
> back to more or less where I was before, at least for signals coming from a
> westerly direction. It is too big to be a permanent fixture, and also
> interacts with the TX antenna. But I think similar or better results will be
> achievable by phasing a vertical antenna against the existing loops here.
>
> Cheers, Jim Moritz
> 73 de M0BMU
>
>
> ----- Original Message ----- From: "Andy Talbot" <andy.g4jnt@googlemail.com>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Sunday, February 01, 2009 5:26 PM
> Subject: LF: 'JNT WSPR
>
>
>> Why are you reporting such a low SNR, Jim ?
>
>
>