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Author Topic: Johnson Kilowatt Matchbox questions  (Read 1855 times)
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N6YW
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« on: September 24, 2014, 07:14:13 PM »

Greetings
My question is an easy one and I am looking for comments that best describe proper tuning settings.
Example: On 75 meters, I can get different settings of tune and match positions that yield a good load for the transmitter. Is it best to find the best match using the most or least amount of capacitance of either cap?
In other words, which cap should I be most concerned with? Is there a general rule of thumb such as using the least amount of C to get a good match, etc...
On 75 meters, I usually end up with both caps around mid scale, so I have made a cheat sheet that gets me to the ballpark and I fine tune from there. It seems that I usually end up waltzing down in C on both.
I want to make sure I understand how to interpret the "correct" approach.
Thank you,
Billy N6YW
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W4AMV
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« Reply #1 on: September 25, 2014, 03:54:47 PM »

Good question. A look at the Johnson schematic and the desire to minimize any loss in the Matchbox. For a given match, the smaller shunt C is desired. Emphasize given match, that means I want to obtain the same desired SWR as seen by the transmitter.
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