How to use Active@ Disc Imager to back up Linux Ubuntu computer
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FOLLOW THESE INSTRUCTIONS AT YOUR OWN RISK. NO LIABILITY ACCEPTED FOR LOSS OF DATA FROM FOLLOWING THESE INSTRUCTIONS. Yes — you can use an Active@ Disk Image USB pendrive on…
December 2025
How to make a byte-for-byte (block-level) backup of a Linux Ubuntu machine remotely
Yes — you can absolutely make a byte-for-byte (block-level) backup of an Ubuntu machine remotely, provided you have either SSH terminal access or remote GUI. Below are the reliable, practical…
Metric equivalent of 1/8 inch diameter bolt to use as monopole probe on cantenna
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…
SRD-05VDC-SL-C Relay
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…
SRD-12VDC-SL-C Relay
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…
Chokes for hydrogen line cantenna feeds
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…
Pyramidal Horn Calculator with examples for 1420 MHz hydrogen-line pyramidal horn build.
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
Designing and building a 1-metre-aperture horn antenna for 1420.405 MHz suitable for hydrogen-line work.
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 (relevant when used for making cantennas for radio astronomy)
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…
Geodesic Dome Dish Plans
Creating a geodesic dish can be an exciting project. These structures are efficient, robust, and aesthetically pleasing. Here’s a detailed guide to help you plan and construct a geodesic dish.…