Hmmmm!
Need to check out the rx later but way too much Tstorm acty to plug it
back in now!
Regards!
Simon
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Alan Melia
Sent: 30 May 2003 14:48
To: LF-Group
Subject: LF: Thunderstorms
Hi Simon and Group, You will find you dont need local flashes and bangs
to get big voltages on a wire aerial. The mere process of highly charged
(but below breakdown)clouds passing overhead will create a very high
vertical potential gradient which the aerial will sample. If you stick
one of those small wire ended neons on a isolated aerial it will flash,
often when there is no audible thunder around. The current generated by
this often passes through the fine wire on the RX input transformer on
the way to ground, and can easily fuse the wire. Thus you can lose the
front end of the Rx without being "struck by lightning" This is why many
amateurs prefer grounded coils with link coupling.
Keep abreast of where the noises are coming from and whether you are
next in line to a "visitation" at http://129.13.102.67/pics/Rsfloc.gif
It is usually about half an hour behind real time. The plot covers from
the Canaries to Russia, and from the Arctic to North Africa, with the
times colour coded, so you can see the storms moving. The info URL to
the TORRO site does not work but if you strip it back to the index page
you will find a fascinating university web site on how to avoid becoming
a statistic, espectially if you play golf !!
Cheers de Alan G3NYK
[email protected]
|
