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From: "Ashlock,William" <William.Ashlock@edwards.boc.com>
To: rsgb_lf_group@blacksheep.org
Cc: lowfer@mailman.qth.net
Subject: LF: RE: WWVB LF transmitter system
Date: Sat, 26 Jan 2002 13:26:29 -0500
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Geri,

Great article! I also thought the WWVB propagation plots were very
interesting. The amout of day/night increase in signal depends to a great
degree on the distance from the transmitter (farthest being the most
dramatic of course), but two listening locations approx the same distance
away from the transmitter do not experience the same db increase.

We are experiencing some very unusual daytime skip conditions in the
400-500mi range on the Lowfer band right now which may go along with this
data. There's also the possibility that my TX loop antenna may take better
advantage of these condition - having a much larger range of possible
radiation angles to bounce-in on the various receiving sites, compared to a
monopole.

Have any of you guys experienced these effects?

Bill Ashlock
Andover, MA, USA

BTW: Didn't see any mention of the WWVB ground system used. Any info on
this?    

-----Original Message-----
From: 'Geri' Kinzel, DK8KW [mailto:DK8KW@compuserve.com]
Sent: Saturday, January 26, 2002 5:59 AM
To: INTERNET:rsgb_lf_group@blacksheep.org
Subject: LF: WWVB LF transmitter system


Hello LF-friends,

I think the most interesting aspect about that paper on the WWVB LF article
was for me to learn that those guys seemed to have the same problems to
find suitable parts as we have. The way they described how the recovered
some old coils and litz wire from de-commissioned stations reminded me
pretty much of some "expeditions" that were described here on the reflector
earlier. Also the problems that changing weather conditions makes re-tuning
necessary is something I observe with my small-scale LF station as well.
Interesting stuff ...

Best 73

Geri, DK8KW (W1KW) 


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