--------------------------------------------------
From: "Mike
Dennison" <
[email protected]>
Sent: Sunday, April 17, 2016
1:01 PM
To: <
[email protected]>;
<
[email protected]>
Subject: LF: 137kHz
rarity
> There was some unusual propagation last night on
137kHz.
>
> Opera32 transmissions from IZ7SLZ were received well by
M0DSZ or
> several hours but were not receive at all by me. Nothing
strange
> there as M0DSZ has an exceptionally good receiver.
>
> I received R7NT's Op32 several times during the night whilst M0DSZ
> received him less often. Again, nothing odd as LF propagation is
> often selective.
>
> The really interesting thing was
R7NT's SNR was around -40B with most
> reporting stations around Europe,
and with me most of the time. But
> at 0007 he was -19dB, and at 0207
-17dB. Between these peaks, at
> 2312, 0112 and 0312UTC he was back to
around -40.
>
> These were all genuine transmissions reported by
several Eu stations
> every time, but no-one reported those big peaks
which were more than
> 20dB above the Op32 reception limit.
>
> Big propagation enhanced peaks are commonplace on the HF-SHF bands
> but rare on 137kHz. It seems they are also geographically very
>
selective.
>
> Mike, G3XDV
>
==========
>
