Ground Waves and Sky Waves in Sudden Ionospheric Disturbances (SIDs)
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From John at SARA Feb 2025: Hello, The signals that we receive consist of a ground wave and a sky wave, the sky wave being reflected / refracted by the…
2025
First attempt at plotting 3D images using Rinearn3D using Ted Cline’s new ezGal250218e.py script 19/2/2025
The ezGal510 plot needs a lot of data to fill, so it is hard to avoid data gaps. The purpose of the ezGal510 plot is to plot interpolated velocity against…
Initial data analysis from third Milky Way mapping exercise with LRO-H1 & LRO-H2 – 15/2/2025.
So far, only 4 elevations on both radio telescopes. Difference between this data and previous data is that each data reading is integration over approx. 4 minutes rather than previous…
SKAO Making Hydrogen Line (1420.405 MHz) Radio Telescopes from readily available household materials, seen at Astrofest 6 Feb 2025
I was very impressed with this very well developed project presented by SKAO on their stand at European Astrofest February 2025 in London, UK. Using items readily available in most…
Block diagram of hydrogen line (1420 MHz) radio telescope
I prepared this diagram of 1420 MHz telescope. Andy
Cake Pan and Aluminium Flashing Design for Making Cantennae
Alex Pettit, of SARA, has recommended a design for making a cantenna based on using aluminium roof flashing wraped in layers to produce a tube, and a 6 inch cake…
Calculating focal point of parabolic mirrors using string method:
click on link below for instructions: https://www.astronomy.me.uk/wp-content/uploads/2025/02/Calculating_patabolic_dish_focal_point_2024.pdf
Advice on how to build and test the feed for LRO-H2(SCRT)from SARA Member, Don Latham AJ7LL, on SARA RTOP 2/2/2025, with extra information added from other members:
There have been many expert and knowledgeable comments about cantenna feed design on this group and on the SARA RTOP yesterday by people who truly understand the subject – we…
Cantenna Design 1420 MHz
Website recommended by Alex Pettit: https://www.changpuak.ch/electronics/cantenna.php