In , wrote:

On Mon, 20 Oct 2003 18:53:01 -0700, Frank Gilliland
wrote:

In , wrote:

snip
At 27 MHz, any antenna shorter then 5 feet is a waste of time.
snip

Not true. There are antennas at five feet that will match or even
surpass a 102" SS whip.

Bull****.


This has been shown before. Get off your fat ass and do an actual
test. You will find that a Stainless Steel 102" whip can be marginally
beat. You can not realize this by reading a book! Get off your ass.

My "fat ass" has done this test more than once, more than twice.... If, in fact,
you do a PROPER test, eliminating ALL reasonable confounds and recording ALL the
data, you WILL find that the 9 foot whip just can't be beat, as my "fat ass" has
proven more than a DOZEN times before while teaching students how to map an
antenna field (which, BTW, was a lab demo for a number of different issues, not
just antenna types and field strength measurements).

P.S. A 1/4 wave whip of thicker more conductive material can't be beat
by a shorter antenna, but my comment was about the common 102" SS
whip.

Here's your assignment for tomorrow, Tnom:

Compare the resistive losses due to skin effect for a 1/4 wave vertical (27 MHz)
made of both stainless steel and solid silver wire of the same diameter. And I'm
going to help you out by reminding you to integrate the current distribution on
the antenna, and I'll even let you pick an arbitrary diameter and disregard the
taper. Show your work (and don't skip steps).






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