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[AMPS] MFJ-259 and matching circuits

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Subject: [AMPS] MFJ-259 and matching circuits
From: (Jon Ogden)
Date: Tue, 2 Feb 99 09:20:48 -0600
Howdy all,

Just wanted to let everyone know how simple an MFJ-259 makes tuning 
matching circuits.  It's like child's play.  Last night I did the input 
circuits for my amp.  I simulated the impedance of the 4-1000 by placing 
appropriate resistors and caps to ground at the cathode pins of the tube 
socket.  Then I was able to tweak each input network for almost perfect 
SWR.  20, 15 and 10 meters are less than 1.15:1 across their entire bands 
(actually a good bit less).  And 80 and 40 meters are less than 1.5:1 
across their bands.  I could play with 80 and 40 some more but it's 
probably not worth it.

The nice thing about this was that I was able to tune up everything in 
place.  And it takes into account all of the other things like blocking 
caps, filament choke, etc.  It really works well.  I wish I would have 
had it in the past.  It is worth the investment.  Just wish mine was the 
new "B" model.  Oh well....the price was right!

It ends a lot of trial and error.



Jon Ogden

"A life lived in fear is a life half lived."

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