[Lf] [Fwd: LF: Propagation measurements on-line]

[Andre' Kesteloot]

Alan Melia wrote:

> Hi David, the software I am using at present has no facility for output of
> the data whilst it is being collected. Whilst it would be possible to write
> something I have other more pressing priorities. I think from the
> corresponence that John and I have had and some comments from Dave G3YMC, it
> is not really necessary to go to those lengths.
>
> John monitors DCF39 and another of the DCFs below the band. It is
> interesting that often these show slightly different results, which may be
> due to the different frequency. If the differences in strength are due to
> Optical-type interference then location and frequency do play a part in the
> timing of peaks and nulls. As Dave says he gets peaks and nulls at different
> times to me, and often higher peaks. Some comments from Laurie confirm the
> same story.....the general picture for a night is similar but the
> 'fine-structure' differs with location. In general Johns appreciation of
> band condition from his knowledge of the variations in the DCFs coincide
> quite well with my findings listening to CFH. (Well I think we would
> generally expect the path to be reciprocal) The main differences being due
> to the higher ERP of the DCFs, and the different frequencies.
>
> During unsettled periods the signal from CFH can rise to high levels very
> quickly (over a matter of a few minutes) In the more stable periods it seems
> to rise more slowly but stay up for much longer. I need more plots of the
> stable periods with my latest set-up, because the arrangement I was using
> earlier was running into saturation at the higher levels, and is not
> reliable
>
> Cheers de Alan G3NYK
> Alan.Melia at btinternet.com.