2025
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Catalogues of H1 sources (hydrogen)
The THINGS survey is what you are looking for – research paper (web) can be seen below: https://iopscience.iop.org/article/10.1088/0004-6256/136/6/2563/meta Download above THINGS survey research paper in PDF format by clicking here:…
Coaxial cable choices for radio astronomy from Norman Pomfret
Co-axial cable Impedance. Matching impedance is not too critical when you are not transmitting POWER. where out of phase reflections can cause much higher voltages to be created often referred…
Instructions on using 20m Skynet radio dish at Green Bank Observatory
Observing Advice for the NRAO Skynet 20-meter telescope Following is from 22/3/2025 on following link: https://www.gb.nrao.edu/20m/obsadvice.html Links UNC Skynet 20m skynet interface Log of 20m results. latest observation NRAO Skynet…
My data so far from 20m Skynet dish at Green Bank Observatory
SARA members have access to this telescope, providing an incredible opportunity to use a professional telescope for personal observations, which will be used for educational purposes. A ZIP file of…
1m Triax Satellite Dish arrives for water maser radio observing programme
Another project underway is water maser radio observing. This requires a 1m dish (arrived today, below) and an LNB for 22 GHz (ordered from USA) and a HEQ5 Pro mount…
Video from inaugural meeting of British Astronomical Association Radio Astronomy Group Hydrogen Line Group
Click below to download video:
How to zero resistance measurements on VA40B Multimeter
I own the VA40B Multimeter – part of my testing regime for aerials involves measuring resistance. To ensure accurate resistance measurements with your VA40B multimeter, it’s essential to account for…
Direction of movement and Doppler shift in radio frequencies
In cosmology, a positive Doppler shift in radio waves means an object is moving away from us. This happens because the waves get redshifted — their wavelength stretches, and the…
ChatGPT advice on how to look for cause of mal-performance on 1420MHz-tuned Yagi aerial 17/3/2025
1. Visual Inspection Check for: 2. Continuity and Resistance Testing Using a multimeter: 3. SWR Measurement Use an SWR meter or antenna analyzer at 1420 MHz: 4. Feedline Loss Test…