Thanks Tom for your reply. To my reconing the output
is a carrier of 2MHz pulses (500nS period) with a very
low duty cycle (20nS). The pulse, at least
theoretically, carries a lot of harmonics extending up
to 30MHz.
Perhaps an antenna tuner, a 50 OHM dummy load, a
current metter for the amp suply, and an osciloscope
to watch the magnitude of the output pulse could
provide a clue where the output impedance lies, but I
am not sure about the acuracy of such a measurement
....
N2NNU
--- Tom Rauch <w8ji@contesting.com> wrote:
>
> > My apologies... I misses the "V" after the 70 so
> the
> > output of the amp/generator is a 70V pulse with a
> > width of 20nS every 480nS. This means that the
> period
> > is 500nS and a duty cycle around of 0.6%.
>
> Good luck on adjusting things while watching a
> thermometer.
> I can't imagine doing that.
> It would be far simpler and more accurate with a
> pulse to
> build a detector. You are not trying to measure
> average
> power, you are trying to measure maximum energy
> transfer.
> There is a big difference.
>
> If you match for maximum peak voltage across the
> load you
> have the optimum loadline for the source.
>
> The problem is you don't have RF or at least I
> didn't see
> where you say anything about RF. You have a "50 kHz
> fundamental pulse" every 480 nS. No way to tune
> that with a
> tuner. Or is that a .00002 second burst of RF at
> some
> frequency? Is it a very square waveform with lots of
> odd
> harmonics??
>
> 73 Tom
>
>
>
>
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