I now have 2nd one of these – video comparing it to Leo Bodnar 1421 GPS disciplined time source can be downloaded at: https://files.ad.thornett.net/astronet/Testing2ndRubidium5650A300926@1228-edited.mp4 Quite big file – 8 GB…
SDRplay RSP2: It goes remarkably low: For your VLF work, the important part is the High-Z input. It has a nominal 1 kΩ balanced input and a 30 MHz low-pass…
With a VLF receiving loop, you usually do not need conventional 50-ohm impedance matching. At VLF (say 10-30 kHz), your loop is electrically tiny. Its impedance is dominated by the…
Large high-power VLF transmitters used for submarine communication (typically about 15-30 kHz) generally transmit digital information by deliberately changing the phase and/or frequency of the carrier. Straight amplitude modulation is…
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
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