Here’s a set of things I’ve collected on the internet about Amateur radio devices. This includes radios, tuners and amplifiers.
If it’s here it’s likely I’ve repaired it or hacked on it!
AX.25 implementations are hardware/software:
Stuff i keep poking around with filters.
There’s plenty of variation in the 13 pin accessory jack. I’m keeping notes here.
I’ve been keeping a list of optional filters here.
Some notes for aligning kenwood HF radios.
Service bulletins for the earlier radios can be found here.