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Author Topic: 809 and 812A "Old Buzzard" rigs.  (Read 1703 times)
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WA4WAX
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Posts: 417


« on: July 05, 2017, 05:54:35 PM »

Think this one over:

Ditch the swinging link tank circuit.  Build a symmetric, balanced Pi-L circuit for the two push-pull tubes.  Make the output Z 50 or 100 ohms.  Put a 2000 pF blocking cap between each tube and the balanced tank.  Match the caps on a bridge or DE-6000.

Now, run out to a balanced, low pass T.  That would be 4 inductors and one cap in shunt.

Set low pass T to match antenna.

Nice scheme: Tune up AM Tx into a balanced 50 or 100 ohm load.  Tune LP T match circuit for 50 or 100 ohms at input.  Off you go!

Lots of harmonic suppression here!



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