Its a definite problem, but then you have got to think about what is
going on 100% of the time on RX.
E
On 30/01/2012 16:19, mal hamilton wrote:
Opera is severe on the CPU, mine is
around 70 % and peaks 90 at times
mal/g3kev
----- Original Message -----
Sent: Monday, January 30,
2012 3:37 PM
Subject: Re: LF: 500 opera
V
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
|
|
