31 December 2025

Are knots rocket science?

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Not much interesting has happened in my lab this December 2025. Nevertheless I want to document a curious find from yesterday. I was browsin...
28 November 2025

Failing Polar M430 battery

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At the sport club attended by a family member they use extensively Polar M430 GPS fitness trackers. These M430 combine the flexibility to c...
31 October 2025

USB booster generates LOTS of RF interference

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I bought some boosters from USB to 9 or 12 V. The idea was to power an old-ish handheld receiver so that I don't have to buy a new batte...
27 October 2025

Efore Barco Power Supply conversion

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The Efore label I received an interesting NIB/NOS power supply used in videowalls. It is an Efore RHPS493 that sports both  8.3A at 48.6V a...
25 September 2025

Albrecht AE 2990 multimode CB/HAM handheld

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I knew it existed but never met one: a 10m multimode handheld. Meet the Albrecht AE 2990 AFS . The same hardware is sold under other brand ...
27 August 2025

UV-3R Plus fading display

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I got a second-hand-new Baofeng UV-3R Plus and it shows a problem that has not been documented (or I use the wrong search keywords): the LC...
31 July 2025

Friedrichshafen 2025: sadness

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The largest(?) European(?) German HAM fair for 2025 is over. As in the past, I have planned to limit my fair time to one day but this year ...
25 June 2025

Sega Master System II power supply

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I was testing some Sega Master System 2 vintage game consoles with a friend and we couldn't get a signal out of them. I used a portable...