Cygnus A hydrogen source type from SARA Meeting 21/12/2025
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@Rick K0GD Cyg A is a continuum source, so you won’t see it in hydrogen line. Instead you will just see an increase in power over the whole spectrum when…
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Linear vs switched mode power supplies
Here’s a clear, practical comparison, with an emphasis on noise-sensitive and technical uses. Linear Power Supply (LPS) How it works Mains → transformer → rectifier → smoothing capacitors → linear…
Github repositories relevant to USRP B210 SDR 17/12/2025
jocover/OpenUSRP using LimeSDR to simulate USRP B210 on 7 Aug 2021 busyrock/Osmocom-GSM-For-USRP–B210 All components of Osmocom GSM project on 19 Jun 2019 ismagom/b210_usb_error Small program to demonstrate an error in…
Circuit board USRP B210 SDR 2025
Photo of circuit board for USRP B210 software-defined radio.
Julian Palmer Design Monopole Probe Assembly for Cantenna 12/12/2025
Our intention is to design a cantenna where fine tuning can be achieved experimentally in the same device without needing to re-make the cantenna or physically cut bits off the…
Ku-Band Interferometry
From the Society of Amateur Radio Astronomy Mailing List 12/12/2025: We operated a Ku-band interferometer with two 1.2-m dishes placed on a 10-m baseline in east-west direction. It is dismantled…
Start Simply, Build Slowly – The Best Advice for Amateur Radio Astronomy
Drift scanning works well for hydrogen line work, even with small antennas or dishes and I would strongly recommend starting with that. With regards to pointing/compass, make line on the…