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OLTC update - Poor seconadry Q
Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
I have adjusted my coil as best I can but the output still seems "weak". I
think I now know why. My secondary Q is only 36. That works out to a
secondary AC resistance of about 3300 ohms!! R = 2 x pi x F x L / Q
Paul - The pinger file is here if your are interested.
The waveform is at:
Just to give an idea of how bad this is... I am pumping and quenching 317
watts into the secondary system. 53 watts is going to streamers and a
stunning 264 watts is going into heating up the secondary!!!
So 83 percent of the power is "lost" :-((
Some notes are at:
The entries at the last tell of the Q=36 case.
So... I don't know if it is the SonoTube, surroundings, proximity effects,
plastic wrap coating... Have to test some things... A small chance it
could be the anti-parallel diodes...
Of course, this is not a problem with the basic OLTC technology, that works
great!, but rather an age old problem of making secondaries without really
Of course, ideas on how I can fix this are more than welcome :-))
The specs of the secondary system are:
L = 480mH
Wire gauge = #28
Turns = 2760
Winding length = 41 inches
Diameter = 10.75 inches
Q = 36.0 :-p
Fo = 38.2kHz
Csec = 35pF
Torroid 24" diameter x 6.5" cord
Center or toroid 3.5 inches above last secondary turn.