[Repeater-Builder] Re: Z-Matcher adjustment

[Laryn Lohman]

We have a GE MII 225W repeater with the two 110W combined amps, 
driven with the single 110W amp.  The book on this thing describes 
how to adjust each Z matcher, but not any specific instructions when 
combined like these are.  The adjustments interact considerably. 

In this case, what is best, just go back and forth between the two 
amps while connected to the duplexer as normal, or is there a better 
way?  Will the best-efficiency adjustment coincide with the least 
reflected power adjustment?  If not, which one to pick?  Thanks

Laryn K8TVZ




 

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[Repeater-Builder] Re: Z-Matcher adjustment

[k0jxi]

Have not looked at all the posts about the z matcher but has anyone memtioned 
that DB Products makes one for several
bands---150 and 450  and probably other bands. They have a reflected 
voltage/wattage metering circuit built in and one
tunes it for min reverse reading. Just a simple pi network.  Works great.

73, Dale -


 In Repeater-Builder@yahoogroups.com, Tony King - W4ZT <[EMAIL PROTECTED]> 
wrote:
> Couldn't agree with you more.  The important point is that you can't insert 
> an SWR meter or wattmeter in the line to make adjustments and then take it 
> out.  The GE Z-match gives you the directional coupler which gives you a 
> leg up on the adjustment process.  Otherwise you are stuck with the max 
> output for min current.  Of course that should be our objective anyhow but 
> many don't have an ammeter or voltmeter on the power source (I just 
> replaced stuck plastic meters on one of my Astrons with digital panel 
> meters: ).
> 
> 73,
> Tony W4ZT
> 
> At 03:16 PM 1/26/2004, you wrote:
> 
> >Tune for best PA efficiency, not maximum output.
> >
> > --- Jeff




 

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