Brightest nearby galaxies in H1 Hydrogen Line (Jason Burnfield)
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Jason Burnfield’s list with sample and expected spectra. https://www.astronomy.me.uk/wp-content/uploads/2026/07/Jason-Burnfield-Nearest-Bright-HI-Galaxies-Brightness-Order-170726.pdf
What can amateur radio astronomers potentially “see” when using radio to observe the Bubble Nebula?
The Bubble Nebula is NGC 7635 in Cassiopeia (often discussed in amateur circles because it’s an H II/stellar-wind bubble with associated cool gas). For radio observing, the key idea is that…
Best frequencies for amateur observations of masers by Eduard Mol 13 July 2026
Hi Andrew, That’s a question I have been trying to answer for a few years. I will try to summarise what I’ve learned about this below… The OH masers at…
Specifications of Norsat 9000 LDF LNB, relevant to water maser radio observations.
This was purchased for observing water masers at LRO. Water masers are natural microwave amplifiers that occur in dense, warm molecular clouds surrounding young stellar objects or evolved stars. The…
What is cheapest way to generate 22 GHz test signal to test my 22 GHz LNB for masers?
For testing a 22 GHz LNB, you don’t necessarily need a laboratory-grade signal generator. The cheapest options are: If your goal is simply to confirm that your LNB and receiver…
Trimble and Leo Bodnar external RF clocks: Do they produce sine wave or square wave outputs?
TRIMBLE EXTERNAL CLOCKS: It depends on the specific Trimble device. For Trimble GPS-disciplined oscillators (GPSDOs) commonly used as 10 MHz frequency references: If you mean one of the surplus Trimble…
In GNU Radio, can I use a variable to pass data into a Python script into a self-written module?
Yes. In fact, that’s the normal way to parameterize a custom Python block in GNU Radio. There are several ways to do it: 1. Pass a GNU Radio variable as…
I am trying to heat up edge of large piece metal sufficiently to solder it. Heat from normal soldering iron just gets conducted away. What do I use?
For soldering the edge of a large piece of metal, the problem is its thermal mass: it conducts heat away faster than a normal soldering iron (typically 25–80 W) can…
Scaling hydrogen horn elements
The SETI League provides a set of dimensions to build a hydrogen horn. This has two components – the waveguide element at the far end which must have specific dimensions…
What are the other frequencies beside 22 GHz which have bright masers open to amateurs to observe, and what bandwidth is required to observe them?
There are several maser transitions accessible to amateur radio astronomers, although 22.235 GHz water (H₂O) is by far the most popular because the sources are strong and the equipment is…