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 3c90. Show all posts

Showing posts with label 3c90. Show all posts

3 May 2016

Matching the earth-electrode "antenna" at 472kHz

I get asked how I match my earth-electrode "antenna" at 472kHz. Well, it depends on your ground resistance. At my old QTH I just c...

4 Oct 2012

More on LF transformers

Following on from the earlier blog entry about using a 3C90 core for a VLF and LF transformer, I got this reply from Jim M0BMU last night on...

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...

20 Jul 2010

Parts from Farnell - good service

For the first time I ordered parts from Farnell on-line yesterday. In the order were some 3C90 toroids (16mm and 42mm) to use in my 136kH...

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Roger G3XBM: Burwell, Cambridge, United Kingdom

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