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Message-ID: <FSExpBA$yrL4Ewxy@dennison.demon.co.uk>
Date: Sun, 14 Nov 1999 13:44:31 +0000
To: rsgb_lf_group@blacksheep.org
From: "Mike Dennison" <mike@dennison.demon.co.uk>
Subject: LF: sky/ground wave
In-reply-to: <000101bf2e70$c6c86560$bb7f8cd4@dave>
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>>From Dave G3YMC
>
>2.  Propagation.  Mike Dennison says that the Greek RTTY is weak or inaudible 
>during the day. This was the case here during the summer, but now winter is 
>approaching it is copyable throughout the day, often at very good signals.  It 
>seems to get stronger from mid afternoon onwards, but is never less than S7 at 
>any time (and of course way over S9 at night).  It is currently (Saturday 1500) 
>s8 and perfectly readable through the thunder crashes.
>

Agreed.

>Mike says there is little groundwave at HF - yes, but  propagation seems to be 
>quite similar to top band propagation, where there is most definitely both 
>ground and sky wave.  On Top Band during the winter it is quite common to start 
>hearing eastern Europeans from around 1500z in the winter, with some days 
>signals being much stronger that others.  The patterns I am seeing on 136 follow 
>very much the same pattern as that band, and the experiences with CFH earlier in 
>the year (with its very rapid fade after sunrise) seem to further support this 
>view. On this basis the optimum time for transatlantic propogation will be at 
>dawn (0600-0800) in December and January.
>

True, but Andre suggests that EU broadcasters come in best at US sunset
(our midnight).
-- 
Mike, G3XDV
IO91VT
http://www.dennison.demon.co.uk/activity.htm