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 heliograph. Show all posts
Showing posts with label heliograph. Show all posts
9 Sept 2023

Optical communication in daylight

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Earlier, I noticed the the reflection of the sun from my watch face on a distant wall. This got me thinking of heliographs. These were used ...
20 Jan 2011

Optical DXing at around 460THz

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Until I read the webpage below I didn't know that the record for optical morse DX goes back to 1896 and was an astounding distance of 18...
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Roger G3XBM
Burwell, Cambridge, United Kingdom
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