ChatGPT: For 1420 MHz reference switching where speed doesn’t matter, go with a latching electromechanical DPDT transfer (coaxial) switch. It gives you the cleanest path, excellent isolation, and rock-solid matching.…
Question: I am concerned that I have made a bad choice by buying Tohtsu CX-520D coaxial relay from ebay to use to switch reference signal in amd out of my…
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…
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? Short answer: yes—put a low-noise preamp at the antenna…
Following from Alex Pettit by email 4/11/2025:
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…
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…
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,…
In a cantenna for 1420 MHz, how far from bottom of can should be the monopole? Short answer: place the monopole about a quarter of the waveguide wavelength (λg/4) up…
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