From my experiments, the following have been confirmed for my unit, unless stated otherwise. Confirmed pinout arrangement for my particular 5650A device: For the FE-5650A pinout we have been using…
https://www.astronomy.me.uk/first-successful-rubidium-lock-achieved-with-5650a-rubidium-time-source-12-september-2026 The stable waveform from power-up seen on the Rigol DS1102 oscilloscope fits quite well with how a rubidium standard works. The 10 MHz oscillator itself can start immediately and…
Voltage between lock status pin and signal ground pin 7 on 5650A with 4k7 pull-up resistor to +5V source immediately after stsrt-up: Voltage remains at level above until the power…
Getting My FE-5650A Rubidium Frequency Standard Working The Important Discovery I discovered that my particular FE-5650A CPOM / Option-58 rubidium frequency standard requires both +15 V and +5 V power…
The seller of the 5650A I purchased has come back to me with following information: FE‑5650A (Rubidium Frequency Standard, DB‑9 Connector, CPOM / Opt‑58) 1. DB‑9 Pin Assignment (DB9 Male…
The oscilloscope inputs use BNC and my RF devices mostly have SMA, including my new rubidium time source, which I am currently testing.
WHY DOPPLER SHIFT OCCURS IN 1420 MHz HYDROGEN OBSERVATIONS Neutral atomic hydrogen (HI) emits its famous spectral line at: 1420.40575 MHz However, hydrogen gas in our Galaxy is moving relative…
https://www.astronomy.me.uk/wp-content/uploads/2026/09/Ayusthman-Tripathi-presentation-BAA-H-Line-meeting-070926.pdf
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