What coaxial cable gives 6dB over 25m?
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It depends strongly on frequency (coax loss is frequency-dependent), but assuming you mean something in the VHF–UHF / radio astronomy range (e.g. ~1.4 GHz): To get ~6 dB over 25…
What is an FTP cable, as used on the AAA-1C Amplifier for VLF RF?
An FTP cable usually stands for Foiled Twisted Pair Ethernet cable. It is similar to ordinary Ethernet cable, but it has an additional foil shield wrapped around all four twisted…
My SD card on my UKRAA PicoMuon Muon Detector crashed and would not create new CSV files – just said “none” on filename. How I sorted it out.
My UKRAA PicoMuon detector stopped saving CSV data files on to the 64GB SD card plugged into it. I realised the SD needed to be re-formatted. The PicoMuon requires the…
What does compress do in Ubuntu file manager?
In the Ubuntu file manager (usually Files (GNOME Files), also called Nautilus), Compress creates a single archive file containing the selected files and folders. It does not normally reduce the…
Problem and solution: RTL-SDR Blog V4 SDR does not work with default driver in many Linux distributions whereas RTL-SDR V3 SDR does work. This post provides the answer on how to get V4 to work.
Solution and conclusions: After multiple tests, the conclusions are as follows: 1) In many Linux distributions (mine is Alamalinux 9), the default driver is rtl-sdr-v-0.6. With this driver, RTL-SDR-v3 works…
Monthly data from UKRAA PicoMuon detector at LRO 2/7/2026
From the month data folder (sub-folder of “processed” on the Raspberry PI running the PicoMuon muon detector). https://www.astronomy.me.uk/wp-content/uploads/2026/07/month.zip
Timestamp problem on some CSV data files from UKRAA Picomuon detector
This issue has affected some files written to SD cards on two PicoMuon detectors: I attach some screenshots below from a short file as an example that shows the problem.…
How to use DuckDB with large datasets
Below is a single unified DuckDB instruction set combining both versions into one clean, consistent workflow for large radio astronomy event datasets. Assumes columns: Unified DuckDB Workflow for Large Radio…
Why am I unable to run JAVA muon data processing program on my Windows 10 computer, with the following error message appearing: UnsupportedClassVersionError
The key part of the error is: UnsupportedClassVersionError ...has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime…
Development of John’s scripts to analyse PicoMuon stand alone data during transatlantic flight
Hi Andy, Good to see you got the program running, at least on one file. Interesting that, for the top and bottom detectors, the measured standard deviations are lower than…