Monday 2nd July 2009, 21:51
The Efratom Model FRS-C Rubidium Standard
The Efratom Model FRS Rubidium Standard is a sub-miniature, atomic resonance-controlled oscillator that provides an extremely stable signal of 2.048 Mhz TTL, % Mhz, or 10 Mhz (TTL or Sinusoidal). These units are now appearing on eBay and other Surplus Sites and are popular time and frequency standards for Amateur Radio use.
The following technical operations and service documentation has been posted to assist Amateurs in repairing these units and restoring them to proper operation.
The Efratom Model FRS Rubidium Standard is a sub-miniature, atomic resonance-controlled oscillator that provides an extremely stable signal of 2.048 Mhz TTL, % Mhz, or 10 Mhz (TTL or Sinusoidal). These units are now appearing on eBay and other Surplus Sites and are popular time and frequency standards for Amateur Radio use.
The following technical operations and service documentation has been posted to assist Amateurs in repairing these units and restoring them to proper operation.
Thanks to Gerald, VK3GJM, for supplying this information.
| Description | File Name | File Size |
| EFRATOM Description and Operation Manual | EFRATOM Description and Operation Manuals.pdf | 2.44 Mb |
| EFRATOM Model FRS-C 10Mhz Rubidium Clock Lamp Repair Procedures | EFRATOM Model FRS-C 10Mhz Rubidium Clock Lamp Repair Procedures (V1.0).pdf | 121 Kb |
| EFRATOM LPRO 101 Repair Guide | EFRATOM LPRO 101 Repair Guide.pdf | 1.92 Mb |
| Lamp assembly PCB schematic | Lamp assembly PCB schematic.pdf | 47 Kb |
| Frequency Electronics Incorporated FEI 5650A Lamp assembly PCB Layout | Frequency Electronics Incorporated FEI 5650A Lamp assembly PCB (V1.0).pdf | 41 Kb |
| Frequency Electronics Incorporated FEI 5650A Parts Bill of Materials | Frequency Electronics Incorporated FEI 5650A Parts BoM.pdf | 4 Kb |
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EFRATON Rubidium Frequency Standard