Voltages measured have changed to these new values: 2.865 V unlocked 0.264 V locked (Previously were 3.8 V and 1.001 V with 4k7 resistor)
If you mean a metal cantenna/waveguide assembled from several separate sheets or pieces, then yes—the electrical connection between the pieces is quite important, especially as frequency increases. The reason is…
Yes—but the terminology is a little confusing. Aluminium foil itself is always electrically conductive. What you can buy is aluminium tape with a non-conductive adhesive. In that case: If you…
That completes the picture very nicely. The 30-minute run looks highly repeatable and stable. The important observations are: So your measured sequence is approximately: The particularly convincing result Your Pin-3…
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…
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