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Roger G3XBM's (Mainly) Amateur Radio Blog

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Fredbox 2m QRP

Posted: 02 Jan 2022 09:42 AM PST http://g3xbm-qrp.blogspot.com/2022/01/fredbox-2m-qrp.html


It seems hard to think this tiny rig was designed and built so long ago (1974?). It was rebuilt a few years ago and still works. It must count as
one of my favourite all-time rigs.
I would not recommend trying to exactly copy it, but use it as a source for your own designs. Some years ago, I know one club did a PCB for a version
with a loudspeaker amplifier and loudspeaker. I forget who this was.
In its day it had several 100km QSOs handheld and even one of 160km to
France handheld even though just 10mW AM. These days, most local QSOs are
on FM. In its day, it was a very small rig and much smaller than commercial handhelds.
See
https://sites.google.com/view/g3xbm4/home/vhfuhfmicrowaves/homebrew/fredbox .

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