I wonder if the difference in opinions has to do not with right or wrong as a
matter of physics but rather with the customary use of terminology. As I have
understood it, the phrase “velocity factor” is ordinarily used in connection
with transmission lines; AND it is the case that the velocity of a wave in any
medium other than free space can differ – that is to say, it’s slower. Whether
the technical term “velocity factor” covers it all I can’t say. Maybe in
ordinary usage the generic term is “velocity of propagation” which in wires can
vary from 0.7 to 0.99 C
Ted, KN1CBR
------------------------------
Message: 12
Date: Thu, 29 Dec 2016 18:44:57 -0500
From: Don Wilhelm <[email protected]>
To: Walter Underwood <[email protected]>, Elecraft Reflector
Reflector <[email protected]>
Subject: Re: [Elecraft] Small QRP antenna
Message-ID: <[email protected]>
Content-Type: text/plain; charset=utf-8; format=flowed
Walt,
I differ, antenna wires do have a velocity factor to consider. I built
a 6 meter Moxon beam for my grandson out of insulated wire, and the
resonant frequency was considerably low. Stripping the insulation from
the wire brought its resonance point up to what was expected.
The only reason was because the velocity factor for the insulated wire
was less than that of non-insulated wire.
73,
Don W3FPR
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