KL7UW
Frequency Reference Using the Efracom LPRO-101 Rubidium


  I have installed the Efracom LPRO-101 into a used rack cabinet after removing the card cage.
  The cabinet had a regulated power supply module outputting 25.9 vdc which will be used to 
  run the Rubidium and a Downeast Microwave 10-4 10-MHz 4-way distribution amplifier to feed
  equipment in the shack requiring a very accurate reference frequency.  Two 12-volt sealed-acid 
  batteries are float charged to 25 volts to ensure the Rubidium will run continuously even in event
  of a ac power outage.  12-volts will be taken from the bottom battery to power the 10-4 board.

  The rubidium is mounted to a 1/4-inch aluminum plate with six counter-sunk 4-40 screws and the
  plate is attached to a 6-inch square heat sink with 2-inch deep fins (click image for larger view):



















  In addition a simple BITE lock indicator board made by Chuck, WA3IAC:




















  • Rubidium power supply
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  • DEMI 10-4 board and BNC outputs
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  • Rack views showing batteries



























  • Rubidium front panel showing lock indicator
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  • Rubidium measurements: 1-volt peak (10mw); 10,000,000 Hz























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