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

To: "[email protected]" <[email protected]>
Subject: RE: LF: 630M WSPR T/A - WSPR-15?
From: Laurence KL7 L <[email protected]>
Date: Mon, 25 May 2015 17:12:26 -0800
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Thanks Markus - Im able to run two instances on rx one for wspr =2 and tother for 15 and they've not crashed yet.
 Ive a couple of oddities in the fact the decoder on wsprx 15  shows me on 0.475736, not 0.475820 but when I expand the WSPRX spectagraph (pull it out from the corners and across) I don't see anything there - may be Im overloading the rx but its basically terminated and I can only just just hear the primary tone...Hmmm.. Thanks for the confirmation but "dial" (USBdial setting)  is 474.2 n'est pas?
The driver is the U3 hence having to do the maths.
Laurence in sunny South Central Alaska
ps will be in Frankfurt in August but sadly only in transit to London (love these direct over the pole summer charters they do on Condor)

From: [email protected]
To: [email protected]
Date: Tue, 26 May 2015 02:19:54 +0200
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

From: DK7FC
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
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