BOOBRIE200 BNC to SMA jumper coaxial cables purchased for oscilloscope
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The oscilloscope inputs use BNC and my RF devices mostly have SMA, including my new rubidium time source, which I am currently testing.
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Why does Doppler shift occur in hydrogen frequency when doing 1420 Mhz observations?
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…
List of variants of 5650A rubidium frequency time standard
The official February 1998 FEI FE-5650A manual gives the following option numbers. Importantly, these are options that could be combined, rather than 40 completely separate models. Option FE-5650A variant /…
Annotated PCB for 5650A rubidium frequency time standard
Produced for me by ChatGPT – I do not know its accuracy. In addition, there are many variants of the 5650A so you need to find way to confirm layout…
Starting SDRAngel software on my ancient Dell M6800 black laptop
This laptop does not have the required graphics hardware for the program to start without crashing – the batch file below allows it to be started by forcing the program…
Can a loop antenna be designed to avoid polarisation?
Yes — but not with a single ordinary loop. A single loop always has a defined polarization response, so a signal with the “wrong” polarization can suffer a deep null.…
Andrew goes global! A humorous look at amateur radio astronomy
https://www.astronomy.me.uk/wp-content/uploads/2026/09/buckingham_yagi_farm_30_frames_two_thirds_speed.gif
Why do meteors detected by radio scatter appear not have Doppler shifts above 100 Hz but airplanes and satellites do?
If you mean rewrite the equations and symbols using only ordinary ASCII characters, here it is. The key point is that meteor scatter does have Doppler shift. But unlike an…