correction: dial 474.2 kHz (I'll never get this
right...)
Sent: Tuesday, May 26, 2015 2:19 AM
Subject: Re: LF: 630M WSPR T/A - WSPR-15?
Wolf, as far as I know the only way to separate
them in the database seems to be sorting by frequency (which is not very
useful otherwise). There is a peculiarity in that the hh:15 and hh:45
timestamps in the database seem to be "rectified" to even minutes (hh:16 and
hh:46) at midnight UT (just happened to G4JNT entries).
Stefan, I'm not sure about not using -15
on MF. Even though fading is faster and deeper, the WSPR decoder seems to cope
well with it. After all WSPR-2 is useful on HF where fading happens in seconds.
The spectrogram of Andy's transmission last night sometimes showed two deep
fades in one sequence, but it was decoded ok. It has been argued that
a very short and strong maximum might be utilized by -2 and not by -15, and
maybe there's not all of the theoretical 9 dB gain, but I reckon on average it's
not much less.
Laurence yes your frequencies are correct, dial
475.2 kHz, RF: 475.6 - 475.8 WSPR-2, 475.8 - 475.825 WSPR-15.
I wonder if it is possible to run two instances of
WSPRX side by side on the same machine, one for -2 and one for -15? Or would
they crash one another?
73, Markus
Sent: Tuesday, May 26, 2015 1:16 AM
Subject: Re: LF: 630M WSPR T/A
Am
25.05.2015 22:55, schrieb wolf_dl4yhf:
p.s. is there a
possibility to filter / display only WSPR-15 decodes from the database, and
how widespread is the use of that mode ?
...there have been
a few MF TA tests in WSPR-15 in the early 630m days, showing that this mode is
to slow for the path on that band. These tests have not been very extended
though. But most likely there is not a 'gain' of 9 dB over WSPR-2. I would
assume that successful detections are even less likely in that mode over the
pond.
73, Stefan
