Re: LF: Mar 25-26 Best QRB/reports

[Markus Vester <markusvester@aol.com>]

Hi Alex,

thanks for clearing up that mistake - so the VK4YB spots were also listed wrongly on 137 kHz.  

Regarding WSPR-15 vs Opera-32, here are 50% detection thresholds, measured with a constant non-fading signal against Gaussian white noise in 2.5 kHz:

WSPR-15: -38 dB (carrier),
Opera-32: -40 dB (average) = -37 dB (carrier) ,
Opera-32 dynamic deep search: about -45 dB (average) = -42 dB (carrier),
Opds detector : -48.5 dB (average) = -45.5 dB (carrier), assuming phase coherent transmissions.

Note that the deep search modes produce only correlation detections not decodes 

I haven't actually measured the sensitivity of the RN3AUS Opera decoder, but I think it's somewhere between Opera and opds.


Best 73,
Markus


-----Ursprüngliche Mitteilung-----
Von: Alex R7NT <r7nt.73@gmail.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Mo, 27. Mrz 2017 9:11
Betreff: Re: LF: Mar 25-26 Best QRB/reports

Marcus,

I believe these were popular errors:

2017-03-26 09:06	WE2XPQ	0.137596	-27	-1	BP51ip	10	VK4YB	QG62ku	11138	230
2017-03-26 09:06	WE2XPQ	0.475796	-27	0	BP51ip	10	VK4YB	QG62ku	11138	230

2017-03-26 10:08	WG2XXM	0.475711	-23	0	EM15lj	5	VK4YB	QG62ku	13442	257
2017-03-26 10:08	WG2XXM	0.137511	-23	0	EM15lj	5	VK4YB	QG62ku	13442	257
2017-03-26 10:04	WG2XXM	0.137511	-23	0	EM15lj	5	VK4YB	QG62ku	13442	257
2017-03-26 10:04	WG2XXM	0.475711	-23	0	EM15lj	5	VK4YB	QG62ku	13442	257

.......

I'm more interested in WSPR15 vs WSPR2 vs OP32 :-)

What are the ideas about this?

My beacon is now working this way:

OP32 - 32min (1 time TX session) ~137.542

WSPR2 - next 13min (5 times TX sessions) ~137.538 - 544

WSPR15 - next 15min (1 timeTX session) ~137.602-603

Total 60min

I believe WSPR15 is better against WSPR2 on LF for long distances in the usual propagation

73! Alex R7NT  136.73.ru

2017-03-27 0:29 GMT+03:00 Markus Vester <markusvester@aol.com>:

Thanks Alex!

Interestingly, WSPRnet also reports a number of very-long-distance detections from VK4YB, who heard WG2XXM, WH2XGP, WH2XXP, WI2XBQ, WE2XPQ, WH2XCR across the Pacific today.

Best 73,
Markus

...