Factoids about radio telescopes vs optical telescopes
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For say a 10 inch telescope mirror what size dish would equal the same resolving power. And even more mind blowing A 60‑foot (18.3 m) radio dish at 21 cm has the…
Testing radio telescopes with drift scan of the Sun
I am hoping to perform this test on LRO-H4 in the next week if I can. The following shows the current elevation of the Sun from Lichfield UK so I…
What is the ideal length of a piece of box section to make a homemade WR650 waveguide for hydrogen line work?
For a hydrogen-line feed made from rectangular box section, the waveguide only needs to be long enough to establish the TE10 mode and accommodate the probe/backshort arrangement. A useful rule…
How well would 150mm x 50mm aluminium box section work to manufacture a WR650 waveguide for hydrogen line radio astronomy? What other commonly available sizes could be used to manufacture homemade WR650 waveguides?
Dimensions of WR650 waveguide for hydrogen. For the neutral hydrogen line at 1420.4058 MHz, WR-650 is the standard rectangular waveguide size most commonly used. Its dimensions are: Dimension Inches Millimetres…
Current performance of LRO-H2 Solar Cooker Radio Telescope 150cm diameter
For 150cm diameter dish, I would expect significantly better peaks than is seen in this video from last few days. https://www.astronomy.me.uk/wp-content/uploads/2026/06/LRO-H2_DataCollect_Monopole1_2026-05-27-16-05.avi Andy
List Nooelec Software Defined Radios
Nooelec’s main RTL-SDR receiver families are: Here are Nooelec’s commonly sold software-defined radio (SDR) models and product lines (consumer/ham/RTL-based and more advanced units): Notes: For exact current model names, specifications,…
Eric Gibert/supersid: Cross-platform Sudden Ionospheric Disturbances (SID) monitor · GitHub
https://github.com/ericgibert/supersid
Possible untested method to dry out an SDR that got soaked in rain outside.
I have not been able to check the following method – so cannot guarantee that it works, nor that it won’t damage your device. If my SDR does not dry…
Table of length of central supports for cantenna for dishes of different focal ratios
For a dish: F = (F/D) x D where: F = focal length (support length) F/D = focal ratio D = dish diameter Example for a 1.0 m dish: +———–+—————-+…
Is a black hole an isoptropic radiator?
Yes—if you mean isotropic radiator, then an ideal, non-rotating black hole is about as close as nature gets to one. An isotropic radiator emits the same power in every direction.…