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Can orthogonal dual monopoles reduce signal strength in a cantenna? How is cross-polarisation measured?
Extract from SARA Mailing List 20-21/11/2025. https://www.astronomy.me.uk/wp-content/uploads/2025/11/Can-orthogonal-dual-monopoles-reduce-cantenna-signal-strength-Measuring-cross-polarisation-SARA-Mailing-List-20-211125.docx https://www.astronomy.me.uk/wp-content/uploads/2025/11/Can-orthogonal-dual-monopoles-reduce-cantenna-signal-strength-Measuring-cross-polarisation-SARA-Mailing-List-20-211125.pdf MESSAGES BELOW IN REVERSE CHRONOLOGICAL ORDER: From: ‘b alex pettit jr’ via Society of Amateur Radio Astronomers <sara-list@googlegroups.com>Sent: 21 November 2025 22:38.…
What is format used in data files produced by Radio Sky Pipe II Software?
Radio-SkyPipe II (R-SP) uses a binary proprietary file format for its data files. Here’s a breakdown of the format, based on the Radio-Sky documentation: File Format (Radio-SkyPipe II) Interpretation /…
I am using USRP B210. I have set bandwidth to 56MHz. Maximum available sample rate is 10MHz. If i use that then computer crashes due to data overload after a few samples. I have had to reduce sample rate to 2MHz to avoid crashing.
Thanks — that context makes the problem clear. Below I’ll explain why your computer crashes, show the data-rate math with ASCII equations, and give straight, actionable fixes you can try…
How does sample rate relate to frequency and bandwidth on SDR?
In an SDR, three related but distinct concepts often get mixed together: frequency, bandwidth, and sample rate. Here’s how they actually fit together: 1. Frequency (centre frequency) This is simply…
New 160cm solid dish at LRO
Just finished painting it in livery of LRO (silver grey) – previously was white with most of white paint missing! Andy
When ChatGPT writes out equations they look good but when I copy the chat they don’t copy well. How can this be resolved?
That happens because the chat interface renders equations nicely on-screen, but when copied, the raw Markdown or LaTeX comes through in a less readable form. Here are a few ways…
Five Most Important Equations in Practical Observational Astronomy
These are possibly the Five Most Important Equations in Practical Observational Astronomy
Easy Radio Astronomy Software (ezRA)
LRO-H2 Radio Telescope (150cm Solar Cooker Dish)
SDRplay RSPduo Software-Defined Radio (SDR)
Galactic snake from collection and processing by ezRA from SDRplay on RSPduo on LRO-H2 — 16/11/2025
Critical aspects of measurements when making a cantenna waveguide for radio astronomy. Extracts from SARA & BAA Radio Astronomy Group Mailing Lists 19/11/2025.
From Marcus D. Leech: Probe placement with regards to the distance from the back-short, probe length, and positioning of the waveguide at the proper dish<>feed spacing. That is, if you…