Message-ID: <18501.200104171744@gemini>
From: "James Moritz" <j.r.moritz@herts.ac.uk>
Organization: University of Hertfordshire
To: rsgb_lf_group@blacksheep.org
Date: Tue, 17 Apr 2001 18:45:02 +0000
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Subject: LF: Last Weekend / Wolf Tests/ LF Forum
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Dear LF Group,

Not very much time for LF activity over the weekend, but here are 
a few things which happened:

I recorded and decoded IK5ZPV's Wolf signal at 10W level again 
on Thursday night. I also monitored 137.79kHz for VA3LK's Wolf 
beacon sigs on several occasions overnight, but nothing was 
detected.

On Sunday morning I worked G8RW and DF0WD on CW, and 
called OK1DTN, who was a 549 signal with me, but no reply.

On Sunday evening, I took part in some Wolf-mode tests with 
DF0WD. As Wolf-DL4YHF remarked, I was not able to decode 
these, but I still have the recordings, and from the info provided, I 
hope to be able to calculate the appropriate correction factors to 
make it work, once I have finished scratching my head! The CW 
talkback was quite hard work, with the evening QRN making 
DF0WD only R2 at times.

I have been playing with some BPSK modulator circuits, and am 
currently putting together details for for the variable-phase 
modulator I tried out recently, plus also a linear BPSK exiter, which 
takes 137kHz carrier and logic-level BPSK signal, and generates 
an envelope shaped BPSK signal of a few V pk-pk for driving a 
linear PA.

On Sunday afternoon, I heard and saw on the spectrogram screen 
a weak FSK - like signal centred on 137.4kHz with about 80-100Hz 
shift. I wonder if this was an amateur or professional signal?

I am thinking of putting on some more Wolf beacon signals later on 
this week, say Wednesday and Thursday evenings from about 
2000utc - Would anybody like specific power levels? Is 137.5kHz 
OK, or should I QSY?

I will certainly try to make it to the LF Forum in May - I can't see 
any reason why I wouldn't be there at the moment.

Cheers, Jim Moritz 
73 de M0BMU