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…
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…
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…
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 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…
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…
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…
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…
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…
Eduard Mol on one of the SARA meetings/online videos shows plot of W3ORS5 of water maser at 22 GHz. The plot shows LSR velocity km/s from -70 to -20 on…
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