From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Date: Sat, 20 Nov 2010 23:26:41 +0100
Thread-Topic: LF: 500kHz WSPR
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Graham,

the QRM at the bottom end of the band does seemd too much harm to WSPR sig=
nals, some nights ago I had  good copies of WD2XSH despite ithis QRM.=20
The broadband transmission on 500kHz makes the noise level (at the bottom=
 end)  rising to S4  (it is about S1 at the top end), PA0A is booming S9++=
.

73, Rik  ON7YD - OR7T

________________________________________
Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.or=
g] namens Graham [g8fzk@g8fzk.fsnet.co.uk]
Verzonden: zaterdag 20 november 2010 23:06
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: 500kHz WSPR

Nothing  compared to the  'Fog from Frog'
covering that  end of the  band ....?

wspr  never  was any  use on 500  due to  long tx times
and high  local  ground wave  propagation , someone
should  take a look at the  5 meg system and
take note , one short  pulse , job done ..



--------------------------------------------------
From: "Rik Strobbe" <Rik.Strobbe@fys.kuleuven.be>
Sent: Saturday, November 20, 2010 9:45 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: LF: 500kHz WSPR

>
> Some time ago some USA WSPR TX stations moved from 503.9kHz on 501.1kHz=
 to
> avoid RX blocking of local WSPR RX station., This allowed both USA
> stations (listening on 503.9) and  European stations (listening on 501.1=
)
> to copy WSPR DX without RX blocking by local TX stations .
> But I noticed that in the following time more and more USA WSPR RX
> stations moved down to 501.1kHz too. And as a result some (at least one)
> European WSPR TX station moved down to 501.1kHz too (to be copied by the
> USA WSPR RX stations that moved down) and is now blocking the Europeans
> listening here.
> So it seems that the RX blocking problem is back :-(
> I guess this was not the goal ...
>
> 73, Rik  ON7YD - OR7T
>