In GNU Radio how can I make positive complex number negative?
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Nice, this is a very GNU Radio–ish question 🙂 In GNU Radio, a complex number doesn’t have a “positive” or “negative” sign the way a real number does. If you…
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How to figure flush value for GMU Radio GRC flowgraph which changes frequencies regularly and where saved data must not include data from previous frequency?
How to figure flush value for GMU Radio GRC flowgraph which changes frequencies regularly and where saved data must not include data from previous frequency? Great question — this bites…
Scaling the SETI Horn of Plenty (Hydrogen Line Horn Antenna)
Hi Andy, You recently asked a question on the SARA forum “I notice that the SETI Horn of Plenty is a smaller version of the original Ewen Horn that first…
Presentations for GNU Radio Meeting 31/1/2026
Presentation for meeting: https://www.astronomy.me.uk/wp-content/uploads/2026/01/Talk-Demo-BAA-GNU-Radio-Meeting-DRAFT-260126@2300.pdf Andrew Sutowski’s attempt to answer homework from last meeting: My own attempts to answer homework from last meeting: Exercise: Create your own AM radio: https://www.astronomy.me.uk/wp-content/uploads/2026/01/BAA-GNU-Radio-Meeting-Exercise-AM-Radio-201225.zip Exercise:…
What are the Tsys, AEFF, and SEFD of 25m Dwingaloo dish?
There is no single officially published, modern value for the system temperature (Tsys) or SEFD of the 25 m Dwingeloo radio telescope that’s easy to point to. What follows is…
Deep Space Exploration Society
http://dses.sciencehttps://www.youtube.com/@DeepSpaceExplorationSocietyDSES dish 5 miles south of Haswell Colorado, USA38.380857283744184, -103.15636966751099https://www.google.com/search?q=38.380857283744184%2C-103.15636966751099
Comparison of energy consumption of Raspberry PI generations 3, 4 and 5, and typical mini-PC used at LRO
Here’s a comparison of typical power consumption (no peripherals or display) for each device, measured at the wall under different workloads. Device Idle Power Moderate Load (e.g. data logging, web,…
Ultra-wideband (UWB) cavity filters
Ultra-wideband (UWB) cavity filters are specialized RF/microwave filters that maintain the low loss, high power handling, and excellent selectivity of traditional cavity filters, but over a much wider fractional bandwidth…
Compare the Intel Core i7‑1065G7 microprocessor with the first-generation desktop/server era Intel Core i7‑930 for amateur radio astronomy applications
If you compare the Intel Core i7‑1065G7 with the first-generation desktop/server era Intel Core i7‑930 (or broadly the 1st-gen “Nehalem” i7s) you’ll find major architectural, process, power-efficiency and functional differences. Below is a breakdown…
How to clone a drive using Ubuntu’s own built-in tools (no extra software)
If you want to clone a drive using Ubuntu’s own built-in tools (no extra software), the most reliable options are: 🧰 1. Using dd (built-in terminal tool) This is the…