Hey Mal
I hope you are sitting down. I must tell you, I had a Morse QSO
c.12WPM on 500kHz yesterday morning with G3XIZ and very enjoyable it
was too.
My QRP Rig is my own design home built with a home made Morse Key,
the Antenna, 5m inverted L is as big as I can accommodate, it took a
lot of engineering to get the efficiency on 500kHz that it has.
Question, at what point when I start to key that TX from a PIC, with
my own programming, conceived by me, with a Data mode do I become a
worthless Back Box Appliance Operator for whom there is no room on
500kHz.
Eddie
On 30/01/2012 13:47, mal hamilton wrote:
Eddie Om
There is your answer from a MAN that knows
g3kev
----- Original Message -----
Sent: Monday, January 30,
2012 11:59 AM
Subject: Re: LF: 500 opera
V
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 <[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
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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