Jim
Had a look at noon using an Argo QRSS10 screen and could not find a single
open area wider than 5.02 Hz anywhere in the band. All 5.02 Hz spaced lines
are plenty bright so they're likely a problem for WSPR. Guess the program
wasn't designed to co-exist with loran...
Jay
----- Original Message -----
From: "James Moritz" <[email protected]>
To: <[email protected]>
Sent: Thursday, January 15, 2009 9:39 AM
Subject: LF: Re: 136khz WSPR
Dear Jay, Vernon, LF Group,
Jay - Thanks for looking - I can see that could be the problem!
The WSPR signal has a bandwidth of around 6Hz, so the problem is finding
that much of a gap between lines. E.g. with the Northeastern USA chain
with 9960 GRI, lines should appear every 5.02Hz roughly, although I expect
some will probably be stronger than others. Can you look with Argo on a
wider setting to see if there are any 6Hz wide spaces, or at least areas
where the lines are weaker?
Vernon - I'm afraid "SCP/LN8PHG" probably isn't a genuine signal, but WSPR
producing a false decode - this is fairly common when narrow-band QRM is
present, although only occurs rarely when just the band noise is present.
Because of the way WSPR encodes/decodes, it will usually try to format any
"gobbledygook" as a legitimate message with callsigns, reports, etc. You
can usually tell by the outlandish callsigns and locators. A pity really,
otherwise they would be pretty impressive DX!
Cheers, Jim Moritz
73 de M0BMU
|
