HP 8640B External Freq. Doubler?
You don't need the filter. The "push pull" doubler will suppress the
fundamental, (By as much as 40 dB if it's well balanced). Just tune the
8640 to 451 MHz and calibrate the output. If you wish to gild the lilly,
you could install a HPF with lower corner frequency of 512 MHz, but the
original signal isn't much cleaner WRT harmonic content from the dividers.
W4ZCB
That'll teach me to write before breakfast and engaging brain. Make that a
push-push doubler! (Full wave rectifier configuration) The little balun
cores in a TV balun work just fine. Make it all as symmetrical as possible.
W4ZCB
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