Ok Jim
..... Interesting point about moving the discharge point round the
antenna .... may be at the far end is the safest place , would not want
to induce evil spirits in the shed ! .. though I suspect you refer to
137 khz and not 500 , the feed from the variometer is quite 'hot' but
nothing 'glows' in the dark
Re the Bino's , not quite needed as the end of the wire is about 7
feet off the ground , could be the reason for the discharge , the
capacity wire is inverted L shaped , from the top loading coil ..
73 -G..
--------------------------------------------------
From: "James Moritz" <[email protected]>
Sent: Wednesday, March 02, 2011 11:54 PM
To: <[email protected]>
Subject: Re: LF: Corona Discharge - how to prevent ?
Dear Graham, Alan, LF Group,
Corona rings as in the attachment have served me well over the years -
they
do seem to substantially increase the voltage at which the onset of corona
happens. I doubt if multiple rings, spheres etc. will be much improvement,
since then the maximum potential gradient will then just occur around the
wire in the middle of the span instead of at the ends, and the corona
will
move to that point. When I first started fitting them, I found that adding
the corona ring would get rid of the corona at one end or sharp bend of
the
wire, only for it to reappear at a different point, until all ends and
corners, and the connection to the loading coil, were so "protected".
Make
sure there are no loose ends of wire hanging out. Also, try to maximise
the
distance between the wire and any other conducting objects, even poor
conductors like trees, woodwork, masonry, etc.
Cheers, Jim Moritz
73 de M0BMU
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