I am thinking about making my GS35B amp project autotune. A microprosessor circuit will remember the correct tune settings for each band (C1, L, C2) and when I switch bands the amp will tune itselves
Ask Paul WD7S. He has bult several amplifiers this way. But he uses air variable caps, not vacuum caps. See http://home.earthlink.net/~wd7s/gallery_index.htm Also see: http://www.wv7u.com/yc156amp/pi
Hi Marius, I've gone both ways, stepper motors & gearhead motors, for driving tunable elements. I've found the gearhead motor route to be the most practical, especially if you are considering true au
You might also take a look at the URT-23 system specifically the AM-3924 amplifier, it's an auto tune system and uses a matrix of relays to bring in L and C for the tank circuit. The manuals and sch
I made mention of this a month ago on a similar thread. I have a 1976 vintage Motorola manual of an 8877 HF amp using smallish, open frame relays to switch the taps on a PiL coil. Tried to get someon
Take a look at the bandswitch solution used by SM7DLK http://www.qsl.net/sm7dlk/slutsteg.htm at about the middle of the page. It was patterned after a concept used in Marconi 10 kW manually tuned amp