Re: [Repeater-Builder] Re: Z Matcher schem..jpg

[Nate Duehr]

Laryn Lohman wrote:

> As described here several days ago, don't follow the GE directions for
> adjusting these things.  It's far better to adjust for best efficiency
> of the amplifier.
> 
> Laryn K8TVZ

I remember seeing that thread, but no one ever posted a concise 
explanation of how to do that.

Is "best efficiency of the amplifier" -- when you get the maximum RF 
power out for the least current draw?

That sounds fishy to me as overly-simplistic, so if this method truly is 
better, someone may wish to explain it fully...?

Or... is having a Z-matcher slapped on late in production a typical 
American company style fix... "Just slap that thing on and they'll think 
they have a fix for the problem"?

No offense meant to anyone involved in adding it, it's more a jab at the 
American business process where "old products" are neglected vs. "new 
products".

Knowing that the Z-matcher was added late in the MASTR II PA's life says 
  two things to me:
1) Someone found and finally documented and quantified a real problem 
with the design.
2) GE may or may not have fixed that problem properly, but saw the 
problem as big enough to make a change.

Of course, that's the LOGICAL conclusion, and U.S. companies constantly 
surprise me and do illogical things, like fix problems that don't exist 
to counter the (false) claims of the other guy's sales and marketing pukes.

The real story could have been:
1) "Hey boss, someone at company M keeps telling people our PA's blow 
up.  We found a small problem that affects like 5% of the deployed units 
out there, but it's not really that big a problem."
2) "Good, it'll give our sales guys something to say that we fixed. 
Ship it."

Who knows...?  Someone does.

Does it matter?  Not really.

How do you properly tune the thing for "maximum efficiency" is all 
inquiring minds really want to know.  :-)

Nate WY0X




 
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