Sourcing pipe to extend the perimeter of the 150cm satellite dish that forms LRO-H2
Admin
I would like to extend the edge of my 150cm satellite dish by 40-50cm all around with some aluminium mesh. This does not need to follow the parabolic as it’s…
Radio Astronomy
The Bob Stricklin hydrogen line signal generator for testing hydrogen line radio telescopes
Bob has designed and made a neat little patch antenna which attaches to a NanoVNA to produce a 1420MHz signal to use to test hydrogen line systems. (1) Attach patch…
Performance of 150mm x 50mm aluminium box section as waveguide for hydrogen (homemade WR650) vs rectangular oil tin
The WR650 waveguide is an ideal choice to use with the SETI Horn of Plenty Hydrogen Horn Radio Telescope. I have noticed that 150mm x 50mm aluminium box section is…
What does 0.73 dB above background equate to in dBi for hydrogen line horn? I have a typical SETI of Plenty, 4 feet long and 3 feet wide, at 1420 MHz. Read the caveat that comes with this post.
Hydrogen-Line Detection vs Antenna Gain A measurement of 0.73 dB above background does not directly convert to dBi because they describe different things: So, whilst an attempt is made below…
Would the Active Antenna Amplifier (model AAA-1C) make a good masthead amplifier for a VLF loop antenna (SIDs)?
https://active-antenna.eu/amplifier-kit Yes — the is actually a very good choice for VLF loop work and SID detection, much better suited than the LA-200 type devices. The important point is that…
Is a LA-200 active audio loop amplifier a good choice for amplifying VLF loop antennas for SID detection?
If by “LA-200” you mean the common audio induction-loop amplifier units (such as the Sarabec LA-200), then no — it is generally not a good choice as a front-end amplifier…
Maybe this is a stupid suggestion, but does all this mean that if users want the most accurate results they should keep their PicoMuon detectors in a fridge? And, if so, what would be the optimal temperature for the fridge to be set to?
Not a stupid suggestion at all. Temperature really does matter for detectors like the PicoMuon detector, especially because the silicon photomultipliers (SiPMs) inside produce thermal noise (“dark counts”) that rises…
Temperature response of UKRAA PicoMuon Muon Detector
This was originally posted by Andrew Thomas on muondetector groups.io mailing list 26/5/2026: The PicoMuon will behave oddly and even stop working if it gets too hot. This usually manifests…
Radio observation in hydrogen line (1420MHz)
SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna)
The gain of a hydrogen horn or dish depends on its aperture which makes sense as bigger aperture means more light collected. But how does this work with a Yagi antenna tuned to hydrogen?
A Yagi works by a different mechanism from a dish or horn, but the same underlying principle still applies: For any antenna, gain and effective aperture are linked by: where:…
Radio observation in hydrogen line (1420MHz)
SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna)
It is commonly stated that acceptable error in flare angle on a SETI Horn of Plenty is lambda/4. Why is this amount chosen?
The commonly quoted lambda/4 criterion is not really a limit on the flare angle itself; it is a limit on the resulting path-length or surface-position error caused by a construction…