Simple ATU

[Andrew (grayhat)]

Covers all bands from 80m up w/o any band switching, for QRP it can be built using polyvaricons, in effect the hard to find parts are the twin air variable capacitors

full informations here

https://www.pa0fri.com/ATU/FRImatch/FRImatcheng.htm

and here is a nice version

http://dl4cs.de/funktechnik/ant/fri-match/en.htm

this ATU is easy to turn into a remote one since there's no band switching it's just a matter of using stepper motors or R/C servos to turn the variable capacitors plus a couple of relays for the hi/lo Z switching and for the ATU bypass (see second link above)

[Andrew (grayhat)]

also see

https://www.hamradiosecrets.com/homebre ... tuner.html

although the links at previous post carry all the needed infos