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Oh no not again , another from
the Hungarian phase book !
wspr is a
data mode and
qrss is a carrier
detection system ... there needs
to be round 8/10 dB more signal or
8/10 dB more sensitivity to be able
to extract the modulation pay load at
the RX .. and in the case of correlation ,
this is better as the 'pattern'
is being matched , using a pre known
pattern , but I think the standard CW pattern has only a
few state changes , where the 256 blocks
of another well known washing powder gives better
results
bur wspr uses 4fsk so its not
possible to correlate , so that removes
the other chances or decode at the
ariel and detection when using
on/off keying
:_)
Sent: Sunday, September 29, 2013 6:08 PM
Subject: Re: LF: 74550 XRS in Germany
PS: Even QRSS-60 is more promising than WSPR-15
for initial experiments. So the simple modes are still the right way to go.
PPS: I find a small part of this quick success is also due to the
existence of this reflecor which helps to motivate active (RX or TX)
LF/MF/VLF radio amateurs to motivate each other :-)
73,
Stefan
Am 29.09.2013 18:55, schrieb Stefan Schäfer:
Hello
Bob and Hartmut,
My congratulation for that success. Both of you must
have a very suitable system to radiate respectively receive a signal on the
4000m band!
Bob, can you transmit DFCW? If 4000m behaves reasonable
like 2200m, then DFCW-180 should be a good choice! It is a bit slower
and may allow reception of your signal even for station with lower RX
sensitivity than Hartmut offers. Also DFCW gives you a better ID since the
frequency shift is another indicator which separates your signal from random
QRM...
73, GL, Stefan/DK7FC
Am 29.09.2013 10:23, schrieb
Hartmut Wolff:
Bob,
the
capture is a bit tiny, because I used a qrss 120 screen. Your signal was
drifting and you crossed the Loran line just before 04:00. For the future a
frequency 1 Hz lower would be better.
73
Hartmut
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