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33 cm Crystal Source

There is a shortage of simple, economical test equipment out there for 33 cm right now, so if you are on the band, or thinking of getting on, you may find it useful to have a portable signal source separate from your main radio to use for various tasks, including:

  • Testing newly constructed antennas for proper match
  • Beacon transmitter service
  • A portable signal source for antenna pattern testing
  • Testing various UHF or microwave components (cables, relays, etc.) 

The source described here is crystal-controlled, it's output is clean (it uses the 33 cm filter described in the navigation bar on the left) and the output can be varied from 20 mW to 3 Watts. It also has a 1 kHz pulse position for use with other test equipment. It can be powered by any 12 Vdc power source, including a simple "wall wart".

click any thumbnail to enlarge the picture or see more information
Finished Source Inside Layout Output Spectrum Modulation
done.jpg (34448 bytes) inside.jpg (66349 bytes) final test at 3w.jpg (278880 bytes) biasmod.jpg (37445 bytes)
Block Diagram Low Level Stages 3 Watt Final Control
osc-flx-amps.jpg (174120 bytes) 3wfinal.jpg (40740 bytes) pandc.jpg (59833 bytes)