What is difference between Sony A99 and A99-II full-frame cameras?
Admin
The Sony A99 and A99 II are both full-frame A-mount SLT cameras, but the A99 II is a major generational upgrade in almost every area. Here’s a clear breakdown of…
Using 2nd order polynomial equations to flatten baselines on radio astronomy plots from amateur equipment
When I talk about “flattening the baseline,” I am talking about trying to remove a slow trend or curvature from my data. “2nd order” refers to a second-order polynomial—basically a…
Possible GNU Radio implementation of 2nd order polynomial baseline flattening
In GNU Radio, “2nd order baseline flattening” isn’t a single built-in block—you implement it by estimating a quadratic trend and subtracting it from your signal. Here are the practical ways…
Detection of hydrogen on LRO-H2 at LRO using Brian Coleman’s handmade hydrogen line feed
This data was collected using ezCol (Ted Cline’s ezRA suite of software). The dish is sold as a solar cooker for use on camping trips. It makes an effective hydrogen…
Nooelec LaNa specifications
https://www.astronomy.me.uk/wp-content/uploads/2026/04/Nooelec-LANA-Wideband-Low-Noise-Amplifier-Product-Specification-Sheet-Mar-2025.pdf The Nooelec LaNA is a wideband low-noise amplifier used with SDR systems. Here are the key specifications in a clear summary: 📡 Nooelec LaNA (Wideband version) specifications Frequency range…
Jason Burnfield’s Hydrogen Line Drift Scan Analysis Tutorial for Galaxies outside the Milky Way on YouTube
https://youtu.be/D4ehWmEBhAE?si=U40XxTs1g43DUv4U
What is current price of helium for high altitude balloons in UK (April 2026)?
For a high-altitude weather balloon, the cost of helium depends heavily on volume (m³) and whether you buy party-grade cylinders vs industrial gas. Here’s a realistic UK/Europe 2025–2026 picture: 💰…
An USA school STEM project has launched UKRAA PicoMuon detector on a high altitude balloon. They noticed low detection level right up to just before the balloon burst at maximum height, when they saw a high spike in detection? Why might this be?
The observations from the balloon flight can be understood in terms of how muons are both produced and lost as cosmic radiation passes through the atmosphere. When high-energy cosmic rays…
Liquid cooling / temperature-controlled systems
There are quite a few liquid cooling / temperature-controlled systems on eBay and similar marketplaces, ranging from simple DIY Peltier units to proper compressor-based chillers. Below are the most relevant…
What is terminal command on Raspberry Pi to reboot device?
On a Raspberry Pi (running Raspberry Pi OS or most Linux distros), you can reboot from the terminal with: Alternatives Notes