Message-ID: <005501c4a93a$584daf60$6507a8c0@Main>
From: "Alan Melia" <Alan.Melia@btinternet.com>
To: rsgb_lf_group@blacksheep.org
References: <E1CDoIa-0002uL-L0@post.thorcom.com> <000e01c4a8af$2c37bcd0$e901a8c0@bob2l2u6k2n1g3> <002d01c4a8c6$40086720$6564a8c0@P2400> <001a01c4a8df$953be3c0$e901a8c0@bob2l2u6k2n1g3>
Date: Sun, 3 Oct 2004 11:27:45 +0100
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Subject: LF: Re: ZL2CA pics of RN
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Hi Bob congratualtions on a nice "catch". The after sunrise signal is in
line with my findings. The start of illumination of the ionosphere at 100km
altitude is about 1000km ahead (west) of the ground-level dawn, and the last
westward "reflection" that will reach the ground is from around 1000 to
1200km to the west. The early rays of the sun do seem to trigger the onset
of strong absorption but this can be delayed early in the year when the suns
rays are "weaker". There could also be a downwards tilt at the darkness edge
boosting the signal for a short while, but that is surmise. The signal from
Ed is of course at an angle to the darkness line.

It is interesting to know that the signals hold up after your dawn as there
is little mutual darkness on the path between you and western Europe. I
seems like under good conditions as at present we can, as I had hoped, live
with a little daylight at each end of the path.

Cheers de Alan G3NYK
alan.melia(at)btinternet.com

----- Original Message -----
From: "Vernall" <vernall@xtra.co.nz>
To: <rsgb_lf_group@blacksheep.org>
Sent: 03 October 2004 01:26
Subject: LF: ZL2CA pics of RN


> Hi all,
>
> Attached are windowed Argo captures of what I received on 137.7895 kHz,
with
> 120 second dot length.  This is the first time I have observed reasonable
> copy after local sunrise.  I estimate my sunrise to be approx 0620Z but
the
> capture at 0653Z shows there is some signal arriving for approx 20 minutes
> after "sunrise" time.
>
> Also I can report that Andrew ZL2BBJ got T reception of Ed's beacon.
>
> 73, Bob ZL2CA
>