How did you measure the 2 dB Stefan ?
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From: "Stefan Schäfer" <Stefan.Schaefer@iup.uni-heidelberg.de>
Sent: Thursday, October 03, 2013 6:47 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: WSPRX_08r3575
Hi Tobias,
Am 02.10.2013 16:19, schrieb Tobias DG3LV:
Hi Stefan/LF !
Information on the SVN-server says, that there was a noise blanker added.
Thanks for all the infos.
Finally :-) During the time he developed WSPR-15 we were in regular email
contact. To that time i made some tests with DF6NM's slow WSPR version,
tests with 4X1RF and GW0EZY and others. We found that the SpecLab noise
blanker in front of the WSPR input (using VAC) made a S/N improvement of
at least 2 dB. Obviously he anyway didn't include such a tool (which is
much more useful on LF/MF as on the HF bands i think) in the previous
versions.
Now the question is if the new intenal NB is more efficient than an
external SpecLab NB. One could do a test running 4 WSPR-x instances, the
old one, with and without a SpecLab NB and then the new one, with and
without a SpecLab NB... If the new one without a SpecLab NB performs best,
then this would be really an improvement over the older version! If i can
find the time i will do such a test at night.
73, Stefan/DK7FC
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