Hi all,
Not withstanding the fickle nature of propagation, my WSPR / Grabber receive
antenna is not the most efficient, and does suffer from an elevated noise
floor compared to my main station antenna.
Signals are typically 6dB stronger on the inverted L, though I have not
spent any great effort quantifying the differences.
One of the true benefits of WSPR is measurement of signal level variations
at one location, but to get meaningful data on relative strength between
stations would take many receive stations with identical equipment.
That is of course eminently possible, a cheap PC and a standard ferrite rod
active receive system + simple SDR would enable a major propagation study.
Most amateurs have a PC and internet, if a cheap design were published for a
WSPR monitor station, we could potentially get many listening stations QRV
and gather a lot of interesting data. not many transmitters need be on, so
no problem for non NOV holders.
With other 'front ends' any band could be monitored.
How cheap can we make such a system, is anyone interested?
Mark GM4ISM
----- Original Message -----
From: "Andy Talbot" <[email protected]>
To: <[email protected]>
Sent: Monday, February 23, 2009 9:20 PM
Subject: Re: LF: More WSPRing
That's very interesting - I appear to be 10 - 15dB better S/N with
you Johan (-5db S/N) at 1200km, than with GM4ISM (-20dB S/N) at 577km.
Background noise levels ?
Sea path ?
Andy G4JNT
www.g4jnt.com
2009/2/23 Johan H. Bodin <[email protected]>:
Solid copy in JO67MR Andy, including the CW ID!
73
Johan SM6LKM
Andy Talbot wrote:
503.870 +23dBm ERP running now, 34.375% duty cycle ...
Andy G4JNT
www.g4jnt.com
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