[TowerTalk] OT ?? - Manual tuners

[David Gilbert]

I don't have the schematic for that tuner handy, but assuming it is a 
T-Network the most efficient setting will probably be the one where 
either the input or the output capacitance is closest to maximum (which 
capacitor depends upon whether the load impedance is less than or 
greater than the source impedance (rig, coax).  In general, the most 
efficient setting for a T-Network tuner is the one that makes it looks 
as close to an L-Network as possible.  You can prove this to yourself by 
checking out the online T-Network virtual tuner by W9CF at 
http://fermi.la.asu.edu/w9cf/tuner/tuner.html .... you can set the 
values manually yourself, but if you use the "autotune" function it will 
seek the most efficient match.  It will even tell you the efficiency for 
various settings.   It's a very cool application.

73,
Dave   AB7E




On 11/26/2010 10:35 AM, Jim Miller KG0KP wrote:
> Settings, Not brand comparisons; (Dentron MT3000A, but that is not the
> question)
>
> If I am able to match my exciter to the antenna via a setting of ---
>
> #1.  "0-J-0" (Both dials fully to the left)
> and also at
> #2.  "35-K-50" (Left dials set at 35 (of 100 on top half of dial) and right
> dial set at 50)
>
> with virtually the same (each completely acceptable) SWR resulting,
>
> WHICH is the most efficient ????
>
> A: Which should I be trying to match for the highest efficiency, using the
> most capacitance or least capacitance?
> B: Does the inductor setting have more effect on efficiency than the
> capacitance?
>
> Thanks es 73, de Jim KG0KP
>
>
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