Dear Jim,
yes you were about 3 to 4 µV/m here last night - quite a good signal which
would have certainly been audible if not for the statics.
The appended clip shows four of your sequence repetitions, as seen in a high
resolution 21 mHz FFT - of course not readable but
still showing consecutive dashes as a line in the upper trace and a gap in the
lower one. The emission appears to be phase coherent
across symbols of the same type, but not across frequency switching. Apparently
the shift does not happen to be an exact integer
multiple of the symbol rate, and after returning to the original frequency the
phase has lapsed by some amount.
Best wishes, and thank you for this interesting activity during this short
summer night.
Markus, DF6NM
----- Original Message -----
From: "James Moritz" <[email protected]>
To: <[email protected]>
Sent: Monday, June 22, 2009 12:38 AM
Subject: Re: LF: Re: 137khz RX-Test
Dear Gerhard, LF Group,
Sorry you have had no luck so far - I'm sure improvements will be possible.
I will leave the beacon running a little longer - I have QSY'ed to
137.690kHz so you can see how the signal appears on DF6NM's 137kHz grabber
at http://freenet-homepage.de/df6nm/Grabber.htm (Markus seems to have had
the same idea ;-)). As you can see, there is a lot of QRN, but the signal is
reasonably strong in JN59.
Cheers, Jim Moritz
73 de M0BMU
m0bmu_090622_2241.jpg
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