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 transformer. Show all posts

Showing posts with label transformer. Show all posts

23 Apr 2019

End-fed longwire antennas

These end-fed antennas are quite popular, but a 9:1 transformer is usually needed to bring the impedance down to levels that a typical rig...

3 Oct 2012

On-line LF toroid transformer design tool?

I have some 42mm diameter 3C90 toroids and want to use these in output transformers in 3 applications: (1) in the output of a 137kHz (up t...

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Roger G3XBM: Burwell, Cambridge, United Kingdom

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