Two points
Why waste 2.4 kHz when QRS only needs a few Hz with a better S/N ratio.
You agree that a faint trace is visible. If this faint trace was QRS
mode only a few Hz bandwidth would be necessary to read the
intellegence and the signal/noise would be superior.
G3KEV
----- Original Message ----- From: "Clemens Paul" <[email protected]>
To: <[email protected]>
Sent: Sunday, November 08, 2009 7:23 PM
Subject: LF: Re: WSPR
Mal,
WSPR reports amongst stns indicate reception reports usually minus
dB. Most of these
stations are usually PLUS
dB with me or very close to that figure.
WSPR refers the indicated SNR to a BW of 2,4kHz.
So if your receiving BW is say 100Hz your actual SNR is better by
~14dB than WSPR
reports.
A trace of the signal is visible long before a decode takes place,
therefore why
not use QRS in
>the first place.
This may be an issue of your RX/soundcard setup.
I can assure you that with my Perseus SDR RX,set to a RBW of less
than one Hertz
for the display,I can decode every WSPR signal which shows even only
a faint trace on
the waterfall diagram.
At least this is my experience so far.
73
Clemens
DL4RAJ
----- Original Message ----- From: mal hamilton
To: rsgb
Sent: Sunday, November 08, 2009 7:37 PM
Subject: LF: WSPR
WSPR reports amongst stns indicate reception reports usually minus
dB. Most of these stations
are usually PLUS dB with me or very close to that figure.
So what does that prove. I would say it depends on the RX antenna and
not necessarily
propagation. A large antenna yields better results than a small loop
or active whip.
When I switch from my 1/4 wave inv L for 500 khz to a smaller 40 m
resonated loop for 500 the
signals then do go down to a minus db figure.
So what is all this all ABOUT ?
There is also the TX pwr to consider. Two transmitters from the same
location one using QRO
and the other QRP will be received at different levels at a specified
RX location. There is a
lot of misrepresentation and misleading information by WSPR operator
A trace of the signal is visible long before a decode takes place,
therefore why not use QRS
in the first place.
G3KEV
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