Message-ID: <504E733E.5000208@iup.uni-heidelberg.de>
Date: Tue, 11 Sep 2012 01:09:50 +0200
From: =?UTF-8?B?U3RlZmFuIFNjaMOkZmVy?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
CC: Edgar J Twining <edgarjtwining@virginbroadband.com.au>
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Subject: LF: slow WSPR?
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It's a pity that there is no slow-WSPR, e.g. needing 32 minutes or so. 
If WSPR (2 minutes FSK) is about as efficient as OP8 ( i heared so), 
then it should be a real alternative to the slow DX modes on LF but not 
on MF!

There is a software that plays recorded audio files in a faster mode, so 
that QRSS becomes audible. VE2IQ has reported to me last year about it 
but i don't remember the name.

Would it be possible to make our own slow WSPR by using that software 
and playing a 32 minute manipulated WSPR at 16x speed, feeding it to the 
normal WSPR rx software? The slower code could be generated outside the 
program. Would that be a useful test or do i miss something?

73, Stefan/DK7FC

Am 10.09.2012 19:26, schrieb Graham:
> May be  Mal
>
> But  once again  Jim has  the  answer to this  problem ..if  you  can 
> find his  articles  after  Google  trashed the  uk500khz  news group ,
>
> I think Jose R  predicts a  6  dB gain  by  changing  to  PSK  from 
> the Opera  on/off  keying  but  that  would  prevent  most  of the  
> LH/MF usage
>
> G..
>