Roger G3XBM's (Mainly) Amateur Radio Blog

Simple QRP projects, 10m, 8m, 6m, 4m, FT8, 160m, WSPR, LF/MF, sub-9kHz, nanowaves and other random stuff, some not related to amateur radio.

Showing posts with label 50hz. Show all posts

Showing posts with label 50hz. Show all posts

23 Aug 2012

Polyakov mixer and 50Hz hum

There is something strange about my Polyakov mixer based direct conversion receiver for 28.1246MHz WSPR at the moment. On the bench, when ...

7 Feb 2012

Free power radios

KE3IJ 's always excellent website has a novel receiver circuit that derives its DC power from AC mains hum and noise it picks up on its...

27 Apr 2011

Mains hum powered beacon

Recent tests with earth electrodes at VLF have got me wondering about a simple QRSS HF/VHF beacon TX powered entirely from the rectified ma...

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Roger G3XBM: Burwell, Cambridge, United Kingdom

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