[Amps] Load Pulling

[bumerang boom]

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 at 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
> 
> 
> 
> 



       
____________________________________________________________________________________
Boardwalk for $500? In 2007? Ha! Play Monopoly Here and Now (it's updated for today's economy) at Yahoo! Games.
http://get.games.yahoo.com/proddesc?gamekey=monopolyherenow