Hi Horst,
Am 21.10.2010 18:23, schrieb Horst Stöcker:
So it will be possible to hear both - just with only one
computer.
Not sure if you will HEAR my signal ;-) but you can see it while
listening to SAQ!
Would it be a good idea that all RX-stations use the same
setup (.usr) on SpecLab? I now have collected 6 different files here in
the reflector and I am a bit confused now which will be the best to
start with.
There are different settings which work fine. Some are using an FFT of
3.8 mHz, others 4,5 mHz, both is working. Actually it depends on your
QTH and your type of antenna (band limited (like M0BMU or F5WK...) or
not). The file i have recently sent to Tony/EI8JK will work fine in UK
and in a radius of say 2000 km of UK since the samplerate drift is
compensated by locking to GQZ which quite strong here. But it will just
work if your antenna is broad band and not band limited, so that GQZ
can be received. So if you would live in California, locking to NAA
would be more suitable, as an example. Of course you can select all you
need and can configure the system exactly as needed but it seems to be
difficult for some püeople. For me it was difficult as well but i got a
lot of help by DF6NM who quasi grow up with this program ;-) Maybe
Wolf/DL4YHF should held some lessons about SL on 80m SSB ;-)
Several people have received on my 7th experiment without locking to
any reference and it worked as well, due to the good S/N and reasonably
low drift. The drift was rather on my side ;-) So it will work anyway!
It just gets critical if the S/N is very small and the local xtal drift
is high since then, the signal gets spread over several pixels which
will reduce the S/N for each pixel.
What is really important is the use of a band limiting before
the noise blanking, either in the antenna/preamp or in the RX. Thus i
applied a band filter and a clipper+blanker in the files i supported.
Michael Oexner has done the test during my earth antenna transmission
and compared the results. you probably saw the difference! I hope this
answer isn't even more confusing ;-)
73, Stefan
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