The information provided on this website is provided for reference purposes only. It is my personal development blog, and is not intended to act as an educational or advisory tool…
TESTING THE FE-5650A RUBIDIUM STANDARD AGAINST A LEO BODNAR GPSDO The simplest useful test is to compare the FE-5650A 10 MHz output directly with the Leo Bodnar GPSDO, also set…
Video showing measurements: https://files.ad.thornett.net/astronet/5650A_vs_LBE-1421_measurements_230926.mp4 Long video showing drift of Rubidium 5650A time source in real time against the Leo Bodnar LBE-1421 GPS-disciplined time source (1 pps not used): https://files.ad.thornett.net/astronet/5650A_vs_LBE-1421_long_drift_video_230926.mp4
That error means the Python environment running ezRA cannot find the rtlsdr module. The package you need is called pyrtlsdr, even though Python imports it as rtlsdr. On your Windows…
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Andy, First, I’m just curious why your focus on the 1‑second PPS output. Nearly every GPS module provides a PPS signal, so unless you specifically need a programmable frequency synthesizer,…
Download Word file below: https://www.astronomy.me.uk/wp-content/uploads/2026/09/ALAN_1420MHz_Field_of_View_Summary.docx
The Z means “Zulu time”, which is the military/aviation/radio term for UTC (Coordinated Universal Time). So: 1200Z = 12:00 UTC The letter Z comes from the time-zone designator for zero…
You can use the 1 PPS as the long-term GPS timing reference, while allowing the FE-5650A rubidium oscillator to provide the very stable short-term frequency. Conceptually: The key point is…
Hi Andy, I wanted to pass along an operational caution about the FE‑5650A that may not be obvious from normal bench testing. This particular rubidium unit dissipates a very large…
A PLL’s LOCK indication is often mistaken for proof of true synchronization, but in reality it only confirms that the loop is operating within its internal lock window. A rubidium…
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