Tom Donaly wrote:
Slap it on your truck, and tell us at what frequencies it resonates.
Can you get it to resonate at odd multiples of its fundamental frequency?

To be entirely technically correct, it should be pointed
out that we are discussing the first resonance as is
usually used in loaded mobile antennas. Starting from
a low frequency, tune the analyzer until the first
resonance is reached. That is when it is electrically
close to 90 degrees in length.
--
73, Cecil http://www.w5dxp.com

Cecil Moore wrote:
Tom Donaly wrote:
Slap it on your truck, and tell us at what frequencies it resonates.
Can you get it to resonate at odd multiples of its fundamental frequency?

To be entirely technically correct, it should be pointed
out that we are discussing the first resonance as is
usually used in loaded mobile antennas. Starting from
a low frequency, tune the analyzer until the first
resonance is reached. That is when it is electrically
close to 90 degrees in length.

In length? You still don't get it.
73,
Tom Donaly, KA6RUH

Tom Donaly wrote:
Cecil Moore wrote:
Tom Donaly wrote:
Slap it on your truck, and tell us at what frequencies it resonates.
Can you get it to resonate at odd multiples of its fundamental
frequency?

To be entirely technically correct, it should be pointed
out that we are discussing the first resonance as is
usually used in loaded mobile antennas. Starting from
a low frequency, tune the analyzer until the first
resonance is reached. That is when it is electrically
close to 90 degrees in length.

In length? You still don't get it.
73,
Tom Donaly, KA6RUH

Geesh ...

Perhaps my understandings are flawed.

It is my understanding that a resonate antenna will always be of an
"electrically resonate" "length." However, conductor diameter,
covering, stray capacitance (such as in coil turns), "end effects",
dielectrics-involved, etc. may vary this length when physically
appraised ...

Regards,
JS

Tom Donaly wrote:
That is when it is electrically
close to 90 degrees in length.

In length? You still don't get it.

Yes, in electrical length, not physical length. You still
just don't get it.

I gave an example of a stub that is 45 degrees in
physical length yet 90 degrees in electrical length.
You really should take time to verify that stub.
--
73, Cecil http://www.w5dxp.com