On Mon, 04 Dec 2006 19:43:55 GMT, Owen Duffy wrote:

On Mon, 4 Dec 2006 14:47:34 +0000, Ian White GM3SEK
wrote:


There are three articles that may be of interest (John
and others):

http://www.vk1od.net/NaroomaEFW/NaroomaEFW.htm

http://www.vk1od.net/InvertedL/InvertedL.htm

http://www.vk1od.net/multibandunload...ical/index.htm

Some have mentioned avoiding high impedance resonances as they will
damage the tuner. Some of the articles above predict the voltage
impressed on the tuner, and for longish wires, it isn't nearly as
severe as using one of these tuners on 2.4m long mobile whip (as
people do, and in compliance with the tuner user manual).

Taking a system view, all three of the articles show that there is a
lower frequency limit to efficient operation of the antenna system,
and the major contibutions to loss.

Ground loss is commonly the most signigicant element for minimal
installations.

It seems obvious that in order to reduce ground loss, one should
improve the ground system. Taking that system perspective, one of the
ways (and it may be the best way in most situations) to reduce ground
loss is to lengthen the radiator.

Owen
There is a lot to digest there... I am still at it
John Ferrell W8CCW