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It is hard to believe that you can only get a 5 metre inv
L into your property. How about going upwards towards the sky. Try a 10 metre
telescopic fishing rod at least that is twice what you have at present, also
15metre rods are available and should fit into your back yard.
Footprint 10 sq inches
You cannot be serious about your antenna
limitations
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
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