How about 6 x 7.5 inch can for hydrogen line? Short answer: you can use a 6″ × 7.5″ can-sized aperture, but it’s very small for the 1420.40575 MHz hydrogen…
Short answer: 165 mm is the better choice than 145mm can — it gives a larger aperture (higher gain / narrower beam) while still remaining single-mode for 1420.4 MHz. Below…
Running Pavel-a hidusb-relay-cmd.exe from USB HID relay software v2.1 (latest 041225) (Win64): Download from releases on right side on screenshot below the Windows version of the software. This works on…
An 1/8-inch diameter bolt is 3.175 mm in metric.The nearest standard metric size is: ✅ M3 bolt (3 mm diameter) Alternatives If you need something closer to the exact 3.175…
It is a relay for 5V signal control that can be applied and used in areas requiring various contact control. It can receive a 5V signal and control the power…
The SRD-12VDC-SL-C is a small and dependable relay. It uses 12V DC power. It has SPDT contacts that switch between two circuits safely. This relay can handle up to 10A…
A choke can be added to a cantenna feed to improve performance by suppressing unwanted common-mode currents on the outside of the coaxial cable shield. This results in a cleaner…
This calculator calculates the optimal dimensions of a Pyramidal Horn. Click on link below to see examples of calculation for hydrogen line radio observing (1420 MHz): https://www.astronomy.me.uk/wp-content/uploads/2025/12/Pyramidal-Horn-Calculator-with-examples-091225.pdf
Below is a complete, practical guide to designing and building a 1-metre-aperture horn antenna for 1420.405 MHz suitable for hydrogen-line work. I’ll give you dimensions, materials, flare angles, feed options,…
In normal retail use paint tins are not made of stainless steel. Here’s the breakdown: ✔ What paint tins are made of Most commercial paint cans are made from tin-plated…
Admin