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HP 8640B External Freq. Doubler?
I recently picked up an HP 8640B Opt. 323 (8640B in a can) and wonder if
anyone has information on the external frequency doubler so that it can use it's upper frequency position (512-1024 MHz). I want to get 902 MHz out of it to test the feed for my parabolic dish's return loss (SWR). I can build a diode doubler to generate harmonics and then put a 1/4 wavelength of shorted-end coax across its output to select the 902 MHz harmonic, but I'd like to be able to tune all freqs between the 512 and 1024 MHz without building a lot of shorted stubs. How does HP do it with their doubler? Bandpass filtering? Could one bandpass filter cover that much range?? Maybe something as simple as a low pass filter with an Fco of 1050 MHz or so, but with this, how would I keep the fundamental freq (256-512 MHz) out of the output?? Thanks for any leads! -- Scott N0EDV http://corbenflyer.tripod.com/ Gotta Fly or Gonna Die Building RV-4 (Super Slow Build Version) |
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