How do I add 3 logarithmic numbers together?
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To add three logarithms with the same base: log(a) + log(b) + log(c) = log(abc) Example: log10(2) + log10(3) + log10(5) = log10(2 * 3 * 5) = log10(30) If…
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Which battery should I use for the Parkside 12V cordless polisher/sander that I am using to make radio telescope mounts at LRO?
For the Parkside 12V cordless polisher/sander (the 75 mm model), there is little practical difference between using a PAPK 12 A3 and a PAPK 12 A4 battery. Both are 12…
What types of GUI inputs blocks are available in GNU Radio?
In GNU Radio, “GUI inputs” are mainly implemented through Qt (modern, default) or WX (legacy) GUI blocks, plus a few message-based controls in the flowgraph. They let you change variables…
Original auction catalogue descriptions of the TV1 Minicaster I purchased.
Description on BROADCASTbargains website: TV1 Minicaster Satellite Dish Pointer A rare satellite dish pointing system, once part of a KA-SAT outside broadcast uplink van, is being offered for auction. The…
SARA video that discusses measuring Tsys in hydrogen line amateur radio astronomy systems
https://youtube.com/watch?v=4gVUFFxra-U&si=qBMd3ExnKxtG1oC0
Does Yaesu G-5500DC antenna rotator have position feedback that could be used for pointing at and tracking masers?
Yes. The Yaesu G-5500DC absolutely has position feedback, and that’s one of the reasons it is so popular for satellite tracking. The system consists of: Inside the rotators are position-sensing…
Rectangular paint tin purchased to make WR-650 May 2026
I purchased one of these to make a cheap homemade WR-650 waveguide for hydrogen line work.
Cooling SDR on LRO-H4(SETI Horn of Plenty) [hydrogen line radio telescope at LRO].
The SDR (NESDR) crashed a number of times when temperature locally got up to 32 C a few weeks ago, very unusual for us. The miniPC and SDR sits in…
Testing resistance of aluminium window screening I bought for LRO-H2 perimeter extension to reduce ground noise
Result seems a bit high, when considering this following advice from ChatGPT: The resistance of aluminium window screen over 50 cm can vary enormously depending on how you measure it,…