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Re: LF: 500 opera V

To: <[email protected]>
Subject: Re: LF: 500 opera V
From: "mal hamilton" <[email protected]>
Date: Mon, 30 Jan 2012 15:40:34 -0000
References: <007f01ccdeb1$cda0b1e0$0401a8c0@xphd97xgq27nyf> <6269AFC61EFB4E17A5884AF57C3DD948@AGB> <[email protected]> <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]

I ignore on/off keyed data normally because on 500 Khz around EU with a half reasonable signal CW does the trick.
also I do not report Beacon acty.
At present I am comparing Opera v QRS to get first hand info and so far all Opera signals that I can decode are also visible on the waterfall and the majority AUDIBLE
 
mal/gh3kev
 
----- Original Message -----
From: qrss
Sent: Monday, January 30, 2012 2:53 PM
Subject: Re: LF: 500 opera V

Hi Markus

No Mal, Markus said its his Guess not the Answer :-)

Of course Marcus the figures stack up so I have to agree, in fact practice agrees at this very moment as I stare at my monitor displaying the "Challenge".
Clearly there are other factors at work to explain my practical experience of ZERO reports of my QRS3 signal over a period of YEARS on 10m, yet multiple world wide reports of my WSPR (when the conditions are right of course) and all the rig has done is QSY and changed mode. We can rule out this being a frequency phenomena too as I have changed the QRS from above WSPR to below..

One of those factors is the human interface, Mal himself said the other day that he has seen carriers come and go on the band but couldn't be bothered to check them out.
Then there is the operator who can't be bothered to send a report, with WSPR and OPERA he has no choice, other than to hide away from the truth with no internet connection..
The need for human presence with QRS is alleviated by full time grabbers so we can't fully blame the 'I was in bed when conditions were right syndrome'.

As for the Answer lets give it a go, a "Challenge" is running, if anyone notices anything different please don't post it publicly although I will welcome reports direct.

BTW QRS3 carries about the same Data as is possible in OP4  in about the same time, variable depending upon the actual Morse characters, it could be longer maybe for Y0YQQ which OPERA could do in the usual period.

73 Eddie

On 30/01/2012 11:59, Markus Vester wrote:
Eddie,
 
my guess is that in the "Opera vs QRSS" challenge, Mal's odds wouldn't be bad at all:
 
Graham stated that Opera-8 should decode above SNR -32 dB in 2.5 kHz (average). Referenced to 1 Hz, this is +2 dBHz average, or about + 5 dBHz for the CW carrier.
 
QRSS-10 could transmit a callsign approximately in the same amout of time. It is received eg. in Argo at 0.084 Hz FFT bandwidth, equivalent to 0.13 Hz or -9 dBHz noise bandwidth. Thus the marginal Opera signal would be a very comfortable 14 dB SNR in QRSS. 
 
We typically give "O" reports on QRSS signals above 10 dB SNR. This would mean that QRSS could be twice as fast as Opera...
 
Some may prefer the digital decoder from the visual one because "100% all-or-nothing". In my opinion this is not a benefit, as there is no way to detect a signal below the threshold, and judge how much was missing or what type of QRM was present. Of course, with a digital mode yu don't have to bother investigating spectrograms - well, borrowing a term once coined by G3KEV, then that's the ultimate "lazy man's CW" ;-)
 
Best 73,
Markus (DF6NM)
 

-----Ursprüngliche Mitteilung-----
Von: Graham <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Fr, 6 Jan 2012 9:50 pm
Betreff: Re: LF: Opera questions
...
OP31 expected  round  -38 dB  s/n  (ave)     OP8   ~  -32 dB 
 
G..


-----Ursprüngliche Mitteilung-----
Von: qrss <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: So, 29 Jan 2012 9:25 pm
Betreff: Re: LF: 500 opera V

So Mal

Can you see or hear my 12WPM Morse ident between my OPERA signals? I doubt it. I could put QRS3 between, that would be a good test. Say a cryptic message for decipher, one transmission and that is it, if Opera decodes and the QRS remains unread OPERA wins.

Eddie

On 29/01/2012 19:53, Graham wrote:
R Mal
Those  signals where  about  10 db over the  limit ,  so  will  show , OP16 ,  is about 6  dB lower  again. but  a decode  is a decode.. good  start.  
14:44 500 G3ZJO de G3KEV Op4 142 miles -22 dB in SCARBOROUGH
136  is  being  most  used  at the  moment   RA9CUA  is  monitoring 
G..

Sent: Sunday, January 29, 2012 6:14 PM
To: rsgb
Subject: LF: 500 opera V

MF
On 500 Khz so far signals decoded in Opera mode have been visible on the waterfall therefore had the mode been QRSS the result would have probably been better and quicker in QRS 3 - 10
The mode is however interesting and needs little operator intervention.
de mal/g3kev
 


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