"cliff wright" wrote in message
...
Hi!
Anyone had any experience with a G5RV which is NOT symetrical relative to
ground?
Mine is on a sloping section and varies from 3.2 metres AGL at the western
end to 7.5 metres at the Eastern. Although I get a reasonable match with
a single coil Z match tuner I have reason to believe that there is quite a
large electrical imbalance in the system, notably in the poor rejection of
local noise signals.
I came across a Z match circuit on optushome.com.au by VK3YSF which has a
25 pF variable capacitor from one side of the open wire feeder to ground.
However the article gives no further information about this component
except to call it a "Balance" capacitor.
Has anyone else come across this problem? If so was it a question of "cut
and try" or is there a proper technical approach one can use?
Hoping for some "feedback".
73"s Cliff Wright ZL1BDA


Cliff

Have a look at Lloyd Butler VK5BR's article below as he covers in some
detail the idea behind the balance capacitor and importantly a basic test
arrangement to confirm its effectiveness.

http://users.tpg.com.au/ldbutler/Zbalance.htm

Oh and I'm pleased that someone has look at my web page! I have just moved
to Western Australia and have put a new and slightly improved site due to
the new call. See blow. I will add some additional information regarding the
balance capacitor feature on the Z-match.

http://members.optushome.com.au/vk6ysf/vk6ysf/main.htm

Cheers

Peter VK6YSF formerly VK3YSF