OPERA "problems"
I think clover , packtor and other commercial big $$ modems are
also 'private' ? anyone is free to write a dsp decode engine , we
have the numeric side ! , the fact that the systems are free for
all to use with no overheads or pop-ups asking to be liked on face
book or annoying adverts when you change from Tx to Rx
The time sync of wspr is only to reduce the CPU loading , has 'no
affect on the s/n decode level , as you can remember , many of the
posts centred on Op CPU loading , time sync could of minimised
this , but at the expense of user access ,
My main aim is to maintain minimal equipment requirements for
maximum on-air performance , some times these requirements conflict ,
but we can see from the expanding user numbers on LF , the concept
is producing results and as development continues loading etc has
much reduced due to Jose refining the DSP engine
Opera is still only just 8 months old and still evolving , compared
to the unfortunate situation out west, I think 'we' have done well to
progress this far in such a short time ?
Noting , for those who can use SDR or Audio/Rf translation , the 100Hz
b/w MF-2 and MF-7 ROS data modes are available within the ROS data
package , A 'live keyboard' DATA TA decode on 136 has yet to take place
, live I mean single pass decode on the fly , not post processed :)
73 ALL - G..
--------------------------------------------------
From: "IK1WVQ Mauro" <[email protected]>
Sent: Tuesday, September 11, 2012 9:31 AM
To: <[email protected]>
Subject: Re: LF: slow WSPR?
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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