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 sensitivity. Show all posts

Showing posts with label sensitivity. Show all posts

21 Jul 2012

How deaf is the FT817 at 136, 472 and 500kHz?

You may have read that the FT817 is deaf below 160m. This matters if you want to use the rig "as is" without preamps as a receiver...

9 May 2012

Crystal set sensitivity experiments

This afternoon I had a little play with a simple crystal set to see what sort of minimum discernible signal (MDS) was possible. My previous ...

27 Jan 2012

How sensitive can headphones be?

Having made several short-wave crystal sets in my time I have nearly always used the little "deaf aid" very high impedance cryst...

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Roger G3XBM: Burwell, Cambridge, United Kingdom

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