[Fwd: LF: transatlantic tests]
Tue, 12 Jan 1999 17:31:04 -0500
Rik Strobbe wrote:
> At 09:45 12/01/99 +0100, you wrote:
> >>From HB9ASB, JN36pt
> >As proposed by Peter, G3LDO, I will transmit on 137.790 +/- 1 Hz (sorry
> >I have no
> >Caesium Standard, I'm using a Chardonnay Standard instead, Hi)
> >Sunday morning from 04:00 to 05:00 UT in Slow CW and I will repeat only
> >LF transatlantic tests early in this century have shown that highest
> >signal levels are reached in the early morning hours, a couple of hours
> >"away" from the sunrise/sunset.
> >Worst periods are dawn and dusk with deep QSB.
> >The differences in signal levels on a transatlantic path are high -
> >several 10dB's (found in some old german books about wave propagation),
> >so it will be very important to catch the right period.
> >My own observations have also shown strong and stable (plus low noise)
> >signals in the second half of the (winter) night.
> >73 de Toni
> >From my experiences in EA8, monitoring DCF39, I can confirm that there are
> real big signal differences during the night. But despite what I did read
> about LF propagation before (best propagation between 4 hours after sunset
> to 2 hours before sunrise) DCF39 produced the strongest signal rather short
> (1 to 2 hours) after sunset (in EA8). Later the noght the signal got weaker
> again, although I have to admit that no observations were made after 01UT.
> During the 5 nights I observed the band there was only 1 night when DCF39
> was much more stronger (january 1st).
> Maybe the best way to catch the right period is that at the US side they
> observe DCF39 and some BC stations arround 150-200kHz and alert the
> Europeans when signals get stronger.
> Sunset at the US side should be arround 23UT (maybe André can confirm
> that), sunrise in Europe is arround 06-07UT, so I think best chances are
> between midnight and 05UT.
> 73, Rik
> Rik Strobbe ON7YD
> Villadreef 14 B-3128 Baal BELGIUM (JO20IX)