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

["iz7slz.domenico" <iz7slz.domenico@gmail.com>]

GE Group,

I will cooperate to the MF WSPR-15 by putting on my tx on around 475.823 kHz, 50% duty cycle, in even periods.

Tx is already QRV for testing PA cooling. If everythings is ok then i will tx until tomorrow morning.

GL.

73, Domenico iz7slz

Sent from Samsung Mobile

-------- Original message --------
From: Markus Vester

Date:26/05/2015 18:56 (GMT+01:00)
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: 630M WSPR T/A - WSPR-15?

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 <dl4yhf@freenet.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
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)

73,
  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

Sent: Tuesday, May 26, 2015 1:16 AM

To: rsgb_lf_group@blacksheep.org

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