"Les &/or Claire" wrote in message
...
Hi all!
Was wandering round RHC's site (Thanks for the reminder
Mike!)
and came accross this...

http://www.radiohc.org/Distributions/Dxers/coax-rf.html

........ now, I have a random long wire, ungrounded, down the back
garden. A run of RG58 taking it through the window frame and to the radio
via a howes atu. Would one of these air wound chokes help at the antenna
end? Does anyone have any experience of these?

Les

--
Unless you have grounded the shield of the coax- it is and will continue
to act as part of the antenna. Air wound chokes can be very efficient- but
over a relatively narrow bandwidth. Probably the 1st thing to do is to put a
classic 9:1 or 10:1 transformer at the antenna to smooth out Z gyrations and
to ground the shield at the antenna.

W4OP