Hi all,
hm, I am just not understanding why we need a "slow WSPR"? In my
opinion, WSPR is designed to allow a high channel efficiency, e. g. lots
of stations can position their beacons in a very small bandwidth. That's
what we need with only 7 kHz available on MF. Signals can be tracked
down to -27/-30 dB into the noise - I think, that's ok, too.
I agree with you, Roger, that somebody should ask Joe, K1JT, whether
WSPR is optimized for the low bands. Maybe his team can invest some time
in approving WSPR for our needs.
73
Sabine, DL1DBC
Am 11.09.2012 10:31, schrieb IK1WVQ Mauro:
Hi to all,
it is true what OPERA mode is "secret", but, I think, it is better
than WSPR for semplicity: on-off carrier , no time synchronisation
required (then it is possible to made a simple beacon stand alone)..
I read in this goup what DF6NM Markus is working around a
"indipendent" decoding software ...
(" .... I'm still working on the receive side, and the first results
using coherent correlation have been very promising. MArkus")
If this will be, maybe the "solution" of OPERA "problems" ???
73 de Mauro IK1WVQ
At 10.07 11/09/12, Roger Lapthorn wrote:
Stefan,
Maybe it is worth approaching K1JT with a suggestion/request that a
slower version of WSPR be created?
It has been several years since WSPR was first released (2008) and
there is a lot of sense in a version with even better S/N performance.
WSPR still has better Internet database support than OPERA and is not
"secret" in the way the latter is.
73s
Roger G3XBM
-- Via my 2.4GHz transceiver --
On 11 Sep 2012, at 00:09, Stefan Schäfer
<[email protected]> wrote:
> 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..
>>
>
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