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,…
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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…
Yes — rubidium locking and a PLL are closely related ideas, although the atomic-lock servo is not necessarily a conventional electronic PLL in the narrow sense. Think of it like…
In your FE-5650A rubidium frequency standard, being “locked” means the electronics have successfully tuned the oscillator so that its frequency is being controlled by the rubidium atoms, rather than merely…
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