Hi all,
The spurious calls generated here are as a result of a wideband birdie that
wanders through the 500KHz band, probably a switchmode PSU
Not all the bad decodes get uploaded, so there would appear to be some
filtering of what is uploaded
What the software needs is a checkbox after each decode, so that the user
can mark bad messages, the system could them automatically remove those from
the database
I have also been analysing the spots by graphing signal strength, and
comparing for example my reception of SM5BHZ with that of other stations.
(for anyone interested I have used an Excel macro to download specified
spots from the web database, and put them in a formal easy to use with the
graph wizard)
I am coming to the conclusion that the single reported signal level is
barely adequate on 500KHz, an pretty useless when the QSB is fast.. what
WSPR software needs for studying propagation is perhaps 10 or 20 sig level
measurements per period, just uploaded to the database for future study. I
have suggested this to Joe, but I think he has higher priorities and no-one
else has requested anything similar
Regards
Mark GM4ISM
www.dc2light.co.uk
----- Original Message -----
From: "Andy Talbot" <[email protected]>
To: <[email protected]>
Sent: Friday, February 20, 2009 10:11 PM
Subject: LF: WSPR Spots
According to the WSPR Spot database, there is some "interesting" DX
being received chez GM4ISM.
Is there some carrier or coherent QRM present to generate these false
hits?
Just got a WSPR generating routine running on a 16F628 PIC with AD9852
DDS combination.
At the moment it only operates at 100% duty cycle, but I'm Looking at
PN sequences for randomised transmission slots with 20/25/33% Duty
cycle operation.
Andy G4JNT
www.g4jnt.com
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