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My loading coil is 0.5 mH approx wound with 3mm litz wire,
it has no cover just a glass lid on top. Air and rain circulates around it to
keep it cool and weather changes has little effect ie sunshine or showers, even
during stormy windy wx there is very little loading variations.
If you have a large loading coil and short antenna wires
circumstances could be different.
g3kev
----- Original Message -----
Sent: Friday, August 12, 2011 7:02
PM
Subject: Re: LF: PA3BCA
Hi Minto,
Am 12.08.2011 19:42, schrieb Minto Witteveen:
How much power were
you generating? 73’s,
Minto pa3bca
It changes all the time. Not
even sure since i just have an E field probe to decouple some power from my TX
antenna and feed it to a 50 uA amperemeter, shunted by a potentiometer. This
poti was adjusted to show 100% full scale when using 120 W RF before some
weeks. Now reduced the parallel R on the poti so it shows just 25 uA then. Got
50 uA anyway by QRO and more (not sure). So it should be arround 500W. This is
-6 dBfs :-)
But the antenna, i.e. the coil and its cover is very lossy
it seems. When there was rain, i have up to twice the losses :-( Need to
search for an alternative cover (mustn't burn, so a water barrel is no
alternative...).
73, Stefan/DK7FC
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