Graham,
the QRM at the bottom end of the band does seemd too much harm to WSPR signals,
some nights ago I had good copies of WD2XSH despite ithis QRM.
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: [email protected] [[email protected]]
namens Graham [[email protected]]
Verzonden: zaterdag 20 november 2010 23:06
Aan: [email protected]
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" <[email protected]>
Sent: Saturday, November 20, 2010 9:45 PM
To: <[email protected]>
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
>
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