Mysterious Resonant Circuit

[Thaelin]

   In most cases, simulators can be used for a good indicator of how things will go.
But they are still simulators and can not account for everything involved. In some
cases they will down right fail the test. I have learned that it is just best to set it up
and run the test if you want the out come bad enough. It will cost but then what is
"your" limit in seeking the truth out.

thaelin

[EMdevices]

poynt99 thanks for doing the simulation.  It's encouraging to see it give similar results.  Now that you have it up and running you can tweak it and optimize it.  I might try and simulate the same thing when I get some time.  I'm in the process of moving and won't be experimenting for a while...
EM

[poynt99]

EM,

yeah, i might play with it some. it seems 150 Ohms is already about the optimum load. 50 ohms gave COP about 0.8, and 400 Ohms was down to about 1.3.

i'll be curious to see your sim results.

have a smooth move dude 

[Vortex1]

Nice work Poynt

Can you remove the tuned parasitic coil L3, C1  to see what effect this has on the simulation. Can you eliminate this and just peak up the output coil with a variable cap?

Also be interesting to try a "tuned plate, tuned grid" approach (from tubes, United States Patent 3747013) and see if there are efficiency improvements. Basically, tune C3 and C5 to apply to this transistor circuit.

I'll try this with my breadboard.

Curious......V

[poynt99]

vortex,

when i get some time (real busy this week), i'll try what you suggest, and "slapper" also asked for a couple things. maybe this weekend.