Tohtsu CX-520D Coaxial Relay
Admin
Tohtsu CX-520D coaxial relay purchased from ebay Nov 2025: Specifications: Three x type N female connector, has a common and a NC contact. Max input power: 300W pp at 1000…
Admin
Better to use a portion of signal spectrum as reference signal, rather than image shift.
From Alex Pettit, via SARA Mailing List, 5/11/2025: Andrew, see if this analogy helps : The Top 3 Data/Drift Pair shows using an image shift to measure system or sky…
What if any is potential benefit for adding filtering and amplification at antenna in meteor scatter detection arrangement at 143.050 MHz?
What if any is potential benefit for adding filtering and amplification at antenna in meteor scatter detection arrangement at 143.050 MHz? Short answer: yes—put a low-noise preamp at the antenna…
MLAstro SHG 700 Spectroheliograph
Information on MLAstro SHG 700 Spectroheliograph accessed 5/11/2025 from First Light Optics, UK, website: https://www.astronomy.me.uk/wp-content/uploads/2025/11/MLAstro-SHG-700-Spectroheliograph-First-Light-Optics-acc-051125.pdf
Potential Small Radio Telescope Drift Sources
Following from Alex Pettit by email 4/11/2025:
Best method to obtain reference samples for Hydrogen Line work
On 2025-11-04 03:27, ‘Andrew Thornett’ via Society of Amateur Radio Astronomers wrote following in bold, then Marcus Leech responded with answers in italics. Hi All, Interesting discussion on the resistor…
Three versions of Nooelec SAWBird H1 LNA
I made following comment on SARA mailing list 3/11/2025. “I was talking about the Nooelec SAWBird H1 LNA, which it turns out has 3 versions. Worth saying that it is…
Heat Index
The Heat Index is one of the most useful composite weather measures, especially for gauging human comfort and safety in warm conditions. Here’s a concise breakdown: 🔹 What It Is…
What is the “best index” on a weather monitor?
There are a few possibilities depending on what you’re interested in:
Real life test results comparing amplifier performance at 1420 MHz
These results were presented by Andrew Sutkowski at the BAA Hydrogen Line Sub-Group Meeting 3/11/2025. His preference is the WVURAIL ones, which are designed as part of the DSPIRA project,…