Electronic bits and pieces

Class D Wavemeter

An old WWII calibration aid. All UK Radio Hams were obliged to say they had one of these or the American BC221 equivalent or a suitable alternative under the terms of their license (before digital tuning became the norm). It could tell you if your transmissions were within the Amateur band. At least (a) if you actually had one; (b) if you did and it worked and (c) if you did and it worked and you knew how to use it. Most if pressed couldn't satisfy (a) let alone (b) or (c)!

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