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)
...
OP31 expected round -38 dB s/n
(ave) OP8 ~ -32 dB
G..
-----Ursprüngliche
Mitteilung-----
Von: qrss <
[email protected]>
An: rsgb_lf_group
<
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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
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
