|Subject:||[TowerTalk] Vertcal Dipole|
|From:||Bill Tippett <email@example.com>|
|Date:||Mon, 18 Oct 2004 06:07:33 -0400|
On 17 Oct 2004 at 21:27, Bill Tippett wrote:
> It is purely resistive at resonance
Isn't everything? What I mean is, isn't that the definition of resonance in this sort of application? Or is there another definition I should know?
At resonance, X is not necessarily zero in R + jX...it is only at a minimum. From the MFJ manual (W8JI's words I believe):
"RESONANT FREQUENCY is where reactance is zero ohms, or in some cases as close to zero ohms as the MFJ-259B indicates."
My shunt-fed tower for 160m is an example of the latter. The MFJ never indicates zero reactance...I simply tune the series C for the minimum (which is very low but not zero).
73, Bill W4ZV
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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