The s/n report is the average of each decoded bit in the total tx
time frame ..
The variations may be down to qsb , in that in the shorter time ,
there where more demod's at a higher level ...... qsb on 500
asymmetric ?, 30 / 45 seconds up and 60/120 down .. so the short
mode will decode or no decode , longer time may have a better
chance but will give a lower average level ?
perhaps two readings would be more use , max / min of the decode
..or as in ros data , the s/n and the fade margin ,,ie range
.....that's if the system can produce such a reading
All these levels are average as well ..one day/night we might get a
clue as to what process is going on to determine if there is data
in a time slot ... bit like entering the tour-de-France with a po-go
stick and coming in the first 3 :)
G..
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From: "qrss" <[email protected]>
Sent: Thursday, February 09, 2012 8:49 PM
To: <[email protected]>
Subject: Re: LF: Cats among pigeons
The worse question you could ask.
The decodes fall off at the same signal level resulting from the same TX
Power, however OP8 reports -31dB and OP4 reports -28dB I call that worse.
In other words I had a -37dB report from ON6EO, sounds good but would OP4
have been -34dB.
I know you knew what I meant anyway.
E
On 09/02/2012 20:29, Graham wrote:
worse ? is that worse as in fails to decode or decodes at a
worse s/n ? , perhaps worst was the worst word to use to describe
a worsening situation , by only making things worse ?
G..
--------------------------------------------------
From: "qrss" <[email protected]>
Sent: Thursday, February 09, 2012 7:57 PM
To: <[email protected]>
Subject: Re: LF: Cats among pigeons
Yes OP8 decodes but almost always either equal S/N or worse.
E
On 09/02/2012 19:40, Graham wrote:
Interesting Ed.
I would go for OP2 on 500 , that was the speed that produced
the best results at the start , did you have any OP8 decodes?
G.
--------------------------------------------------
From: "qrss" <[email protected]>
Sent: Thursday, February 09, 2012 7:13 PM
To: <[email protected]>
Subject: LF: Cats among pigeons
This one worked before also on the G3ZJO G0KTN path:-
After dark QSB starts on 500kHz even OP4 can become a struggle, the
PA0AM path again.
18:52 18105 PA0AM Op1 -22 dB 322 km Actually on 500kHz
18:50 18105 PA0AM Op2 -25 dB 322 km Actually on 500kHz
18:41 18105 PA0AM Op2 -18 dB 322 km Actually on 500kHz
This could explain why WSPR does so well.
Eddie G3ZJO
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