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Re: Negative Resistance
Original poster: "Wall Richard Wayne by way of Terry Fritz <teslalist-at-qwest-dot-net>" <rwall-at-ix-dot-netcom-dot-com>
Steve,
Good thinking also on your behalf. For those concerned that a solid state
diode does not have ionization like a spark gap, I suggest using a common
neon bulb. After Neon striking (ionization) there is also a "negative
resistance" in their EI curve. I don't have the time, but maybe someone
will design a circuit for dead on tuning a TC primary and secondary around
the common (cheap) neon bulb. Terry?
RWW
> Good thinking! Where do we get KW tunnel diodes or P-N FET combos? I
> believe the Poulsen arc oscillators are an example of high power negative
> resistors.
>
> Here's another, lower powered thought: Could one hook a Lamda or tunnel
> diode directly to a primary LC, causing it to be a few milliwatt
oscillator,
> dangle a scope probe "antenna" a few feet from the secondary, and
real-time
> tune the primary to the secondary by finding the primary tap point that
> gives the highest scope trace amplitude? Probably would have to move the
> tap out a bit more to compensate for streamer loading under normal
> operation. Or, could one just add a wire to the toroid the same length
and
> direction as a typical streamer, and use your lambda diode /scope antenna
> tuner to tune it "dead on" for normal operation?
>
> --Steve Young
--- Richard Wayne Wall
--- rwall-at-ix-dot-netcom-dot-com