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Date: Fri, 09 Jun 2006 21:10:39 +0200
From: henny van elst <cpm@planet.nl>
To: rsgb_lf_group@blacksheep.org
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 <004f01c68a73$5a700240$0300a8c0@lark> <010101c68be6$da546220$0300a8c0@LAPTOP>
Subject: LF: Re: BBC 198kHz
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Status: O

i look for it and make a foto,

73 henny pa3cpm


----- Original Message ----- 
From: "Peter Martinez" <peter.martinez@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Friday, June 09, 2006 7:05 PM
Subject: LF: BBC 198kHz


> From G3PLX;
>
> Alan G3NYK gave some idea of how stable Droitwich 198kHz might be. I had 
> the chance to leave my GPS-locked system monitoring it over most of a day. 
> The results may be of interest.
>
> During the daytime, the maximum phase excursion I saw was 10 degrees peak 
> to peak. The largest change seen over the 5-minute sample interval was 4 
> degrees, corresponding to a worst-case apparent frequency error of 37uHz.
>
> At night there was evidence of skywave, which showed as three cycles of 
> phase-change extending over 30 degrees peak-to-peak between 21:45z and 
> 01:30z. The largest change seen over 5 minutes was 22 degrees, 
> corresponding to a frequency error of 200uHz. A quick calculation from 
> this says the skywave was about 12dB down on the groundwave at it's 
> strongest in the middle of the night. The worst disturbance was in the 
> middle of the night, not at sunrise or sunset.
>
> I am 230km from Droitwich.
>
> 73
> Peter
>
>