[TenTec] OT SWR VS Power Loss

DAVID HELLER dtx at verizon.net
Tue Jul 8 01:29:42 EDT 2008


Lessee, isn't 100pF more like j F(wf)x100 ohms (w being the closest my 
keyboard comes to lower case omega,)  So we can't add the ohms without 
taking the square root of the sum of the squares, which should work fine, 
no? - K3TX
----- Original Message ----- 
From: "Steve Hunt" <steve at karinya.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Monday, July 07, 2008 5:25 AM
Subject: Re: [TenTec] OT SWR VS Power Loss


>
>
> Dr. Gerald N. Johnson wrote:
>>>
>>> As Jerry points out, there are some amongst us who believe that a tuner 
>>> at
>>> the antenna feed point  tunes the antenna wire to resonance. It does 
>>> not.
>>>
>>
>> Why not? The tuner can supply the needed series capacitive reactance to
>> bring the feed impedance resistive. Isn't a resistive feed impedance (no
>> matter what the magnitude) the definition of resonance? And when that
>> antenna is resonant, isn't the current in the wire maximized? Isn't
>> there a possibility of greater circulating current than feedline
>> current, if the antenna Q is higher.
>>
> Jerry,
>
> Mischievously .......  I just tried an interesting experiment. I took a
> 100 Ohm resistor in series with a 100pF capacitor and placed them across
> the "antenna" terminals of my tuner. I watched them carefully as I
> adjusted the tuner for a 50 Ohm match. At no time did I see any change
> in the physical appearance of the resistor or capacitor, so I don't see
> how the tuner was making them "resonant". I was disappointed - I'd hoped
> from your description I might see them "morph" into a 50 Ohm resistor
> before my very eyes :)
>
> 73,
> Steve G3TXQ
>
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