[Antennas] Reducing Losses in my ZMATCH

Wed, 27 Nov 2002 19:18:31 -0500

Juan you may be confusing component Q and circuit Q.

Component Q rates the losses in the component. In my direct response I
tabulated the effect of component Q on output power. 

The tuner has a LOADED Q that is based on the performance of the TUNER
when connected to the rig and actual load [antenna/feedline [VSWR]]. It
is the loaded Q that determines bandwidth [assuming loaded Q < unloaded
Q]. So, a higher Q inductor of the same inductive value [e.g. 20 uH in
either case] will have a very minor increase in output power AND the
Loaded Q would remain the same because it is basically determined by the
magnitudes of the system impedances i.e. Input impedance [50 ohm
resistive, transfer impedance {tuner determined}, load impedance
determined from antenna VSWR, characteristic impedance of feedline,
length of feedline}. As long as these parameters remain the same the
effective bandwidth of the tuner/antenna system will remain the same.

Deacon Dave, W1MCE
=============== 
"Juan A. Bertolin" wrote:
> 
> Hi,
> 
> I'm trying to improve my ZMATCH, following the instructions of W6JJZ in
> NCQRP web site. Currently my one is using a T130-2 core and in the W6JJZ's
> article mentions the option of using T130-6 because the Q is higher. I'm
> quite concern about the losses that I'm perceiving when I use the tuner (by
> means of my Field Strength Meter) in 20m. With the T130-6, I mean with a
> core of high Q the efficiency will be better and I will get less losses?
> But with high Q the bandwidth of tuner will be less, narrower isnt' it?
> 
> Any experience on that? I'm going to perform some tests with T130-6 versus
> #2 but I will appreciate any comments about another way of improving the
> ZMATCH and reducing the losses
> 
> 73s Juan
> 
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