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Re: LF: 630M WSPR T/A - WSPR-15?

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Subject: Re: LF: 630M WSPR T/A - WSPR-15?
From: wolf_dl4yhf <[email protected]>
Date: Tue, 26 May 2015 20:38:48 +0200
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Hi Jochen,

Strange ... I decoded only one out of three your WSPR-15 transmissions.
The signal is strong on the waterfall (even on the WSPR-2 w'f) but a slight slant (frequency drift).
Anyway, I will leave everything running / online just in case anyone
else likes to try.
p.s. letting two instances of WSPR-X running simultaneously, and (by
human operator error) letting both of them transmit, produces a horrible
sound in the transmitter ... this happened during my own WSPR-15
transmission around 18:12 or 18:14 (when the WSPR-2 instance decided to
transmit also - ouch !).
  Wolf DL4YHF

Am 26.05.2015 19:11, schrieb Jochen Althoff:
Hi Markus,

yes it was caused by my GPS-RX which crashed somehow. After a reboot it's okay again and controling my sequence again properly.
73, Jochen df1vb

Am 26.05.2015 um 18:56 schrieb Markus Vester:
Hi Wolf,
that's exactly what I did too, with same results: wspr-2 running and
uploading fine, no chance to test -15 due to lack of signals. But if
signals had been present on both bands, wouldn't both instances try to
access the same files in the same directory, eg. ALL_WSPR.TXT or
settings? Well, with Andy on -15 we may find out tonight.
All the best,
Markus (DF6NM)
BTW I decoded DF1VB for a while with 6.5 seconds latency, and then no
more - might have been a too large clock offset.

-----Ursprüngliche Mitteilung-----
Von: wolf_dl4yhf <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Di, 26 Mai 2015 6:27 pm
Betreff: Re: LF: 630M WSPR T/A - WSPR-15?

rrr Stefan and Markus - thanks for the info.

I have two instances of WSPR-X running, launched from the same
directory, one configured (manually) for WSPR-2 and the other for -15.
Not a single decode from the latter yet.

I guess as long as they run, the two instances don't interfear (:o)

   Wolf DL4YHF .

Am 26.05.2015 02:19, schrieb Markus Vester:
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 *474.2 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

*From:* DK7FC <mailto:[email protected]>
*Sent:* Tuesday, May 26, 2015 1:16 AM
*To:* [email protected] <mailto:[email protected]>
*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

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