From: Rik Strobbe <Rik.Strobbe@fys.kuleuven.be>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Thread-Topic: slow WSPR?
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Date: Wed, 12 Sep 2012 14:09:54 +0000
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Subject: LF: RE: slow WSPR?
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Hello Stefan, all,

first of all: I am certainly not anti-Opera. I have used the mode on 500kHz=
 and for sure it is a useful mode.
But out of curiosity I have done the noise test as described before and I a=
m pretty sure the results are correct: in absense of QRN/QSB WSPR will outp=
erform Opera2 by 7dB in average.
It would be interesting if the man behind this mode would open his books an=
d give us an insight in the demodulation/decoding system.
About Opera32: you had indeed very good result at +5000km. But keep in mind=
 that, having 32 minutes to transmit your call, this should be competitive =
to QRSS30 or DFCW90.

73, Rik  ON7YD - OR7T

________________________________________
Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org=
] namens Stefan Sch=E4fer [Stefan.Schaefer@iup.uni-heidelberg.de]
Verzonden: woensdag 12 september 2012 14:45
To: rsgb_lf_group@blacksheep.org
Onderwerp: LF: slow WSPR?

Hi Rik,

Am 12.09.2012 14:05, schrieb Rik Strobbe:
> Hello Sabine,
>
> as mentioned in the report the test were done off-air, by adding equal am=
ounts of pure white noise to WSPR / Opera signals of identical amplitude.
> So no QRM/QRN or QSB involved. Maybe I will do these tests over with QRN =
and/or QSB added (if there is some interest and if time permits).
>
Yes, there is some interest!
It would be possible to run an audio file in SpecLab, presenting typical
LF-evening noise, maybe plus some DCF/HGA sidebands and carrier! I think
it is possible that there will be a difference, resulting in pro-Opera.
At least yesterday it seemed to me that OP32 cannot be as bad as often
mentioned.

73, Stefan/DK7FC=