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Experience with "Caltech" Class E PAs?

PostPosted: Wed Apr 09, 2014 7:50 am
by Brian K1LI
Dave Rutledge and his students at Caltech have published numerous articles on some very interesting Class E PA designs.

Does anyone have any experience with these units? Boards for the amps described in QST were available at one time, but no longer. I'd like to have the PCB artwork or some photos so I could produce one myself.

Thanks -- Brian K1LI

Re: Experience with "Caltech" Class E PAs?

PostPosted: Fri Apr 11, 2014 11:42 pm
by Gilly
Hi Brian

Have never made the TX but could be a fun project.....

This here is a good read http://www.its.caltech.edu/~mmic/reshpubindex/papers/QST.pdf

The PCB would be easy to make up using a Dremel Tool or something similar......

The FET will get hot so a good Heatsink would be required....also a Variac controlling the Drain Voltage would be nice too.....


Wayne

Re: Experience with "Caltech" Class E PAs?

PostPosted: Sun Apr 20, 2014 12:32 pm
by kf1z
Actually, there was something pretty flawed in the caltech documents....

I can't remember what it was, but I remember possibly Steve, QIX commenting on that several years ago.

Re: Experience with "Caltech" Class E PAs?

PostPosted: Sun Apr 27, 2014 4:01 pm
by Diego-CX4DI
Dears,

I just experiment the Caltech Class E circuit in 7Mhz and 10Mhz some year ago and work very good as CW amplifier. Very recommended!

best 73's
Diego
CX4DI

Re: Experience with "Caltech" Class E PAs?

PostPosted: Thu Dec 31, 2015 9:07 pm
by steve_qix
The main problem is a complete lack of headroom. Everything is run right to the edge.