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…
2026
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:…
Push button blocks in GNU Radio, and how to continuously display a variable state such as the one changed by a push button or other mechanism
Is there push button block in GNU Radio Companion? Yep — there is 👍 In GNU Radio (QT GUI) you’ve got a couple of button-style options, depending on what behavior…
If I want to make a bigger version of the SETI Horn of Plenty, still for 1420 MHz, how do I increase the dimensions?
Same frequency, physically bigger horn — not frequency scaling.This is where horns stop being “just scaled” and start being designed. Short answer first:You increase the aperture size, but you do…
How does flared section of hydrogen line horn antenna scale with changes in wavelength measured?
Short answer: it scales linearly with wavelength.Longer answer (the bit you actually care about 🙂): For a hydrogen-line horn (≈1420 MHz, λ ≈ 21 cm), the flare geometry is set…
Find me an URL for original SETI Horn of Plenty dimensions
Following is result of asking ChatGPT the above question 27/1/2026!!!! Here’s a source that actually describes the original SETI Horn of Plenty antenna design and its dimensions: 🔗 SETI League…
Data .txt Files & Timelapse Video of Data Collection of comparison between ezCol.py & ezColGR (GNU Radio version) on LRO-H2(SCRT) using same 150cm dish, feed and SDR 24-25/1/2026
These are both relatively long integration times on the Intel i5 MiniPC used for this experiment. The numbers are not equivalent – in both cases I attempted to obtain an…
Data Collection Videos from LRO-H1(Ptarmigan Array) 23-24/1/2026 with use of ezColGR test GNU Radio Script
Screenshot: Data Collection Videos: Data Files: https://www.astronomy.me.uk/wp-content/uploads/2026/01/LRO-H2_ezColGR260104GR_260123_13.txt https://www.astronomy.me.uk/wp-content/uploads/2026/01/LRO-H2_ezColGR260104GR_260123_14.txt https://www.astronomy.me.uk/wp-content/uploads/2026/01/LRO-H2_ezColGR260104GR_260124_00.txt