[Boatanchors] Waveforms for Oscillator "Booster" in WECO 227B

[David Stinson]

I was asked about waveforms of the simple 
"oscillator booster" I'm using in the WECO 227B.

Sorry the MOSFET Gate waveform photo is bad.
I needed one hand to hold the scope probe, one to
hold the camera and one to key the PTT...

Here's the circuit again as a reminder:
http://home.netcom.com/~arc5/oscbrd.jpg
http://home.netcom.com/~arc5/oscbrdtop.jpg

Before we start talking about improving my 
primative thingie, remember the goal:  a cheap,
simple and effective replacement when one doesn't
have a crystal.  "Efficient" is not a priority.
If it works without blowing itself up (or something else),
I count it "good."  The thing can be improved many ways,
but if we start adding too much we defeat the whole idea.

I don't think my scope is properly calibrated on the 
10 V per division scale.  It says the input waveform is
10 V PTP but my supply rail is 5.5 V?

The GATE waveform is nasty.  I'm guessing
at what the points I noted mean.  And you can see 
a little high-freq parasitic just like Arden said there 
would be, but it's pretty low level and happening
while the MOSFET is not conducting.
http://home.netcom.com/~arc5/GATE.JPG

Here's the waveform that appears at the 6L6 grid.
The grid resistor is 100K.
My scale ends at 60 VPTP and my 10:1 probe is 
busted so I'm estimating this waveform at 80V PTP:
http://home.netcom.com/~arc5/PAGRID.JPG
There's a series cap-inductor in the grid circuit
which goes over toward the Modulator.
Don't know why;  I still don't have a diagram.
Maybe it's ringing?  But the inductor looks 
more like an RFC.  The cap is 50 pFd.
Aside:  The little HC-25s work well in a lot 
of things, but won't oscillate in this circuit.
They work OK in the receiver oscillator.

Here's the output at the antenna connection:
http://home.netcom.com/~arc5/PAOUT.JPG
Power out was 8 watts into 50 ohms resistive.

73 DE Dave AB5S