Power Amplifier Design – Need Consultant to Build and Design

Hello, I am an hobbyist trying to replicate "Cold Fusion" experiments. (If you are one of those people who think Cold Fusion is a fairy tale, please don't bother to insult me with your opinion. I am not here for that.) I need an RF engineer to design and possibly build an RF amplifier to power one of my cold fusion experiments.

I need someone to design and build it and I am prepared to pay for the work.

I need the following specs:

1. A device that will output around 300W onto a coil of about 1000-2000 ft of #34 magnet wire wound around a 3/8" copper tube 3" in length. The output power needs to be adjustable to a certain degree. Maybe attenuated. I am not concern too much with power lossess and impedance matching or stability. I just need the power and the frequency.
2. The device should output a sine wave, any distorted sine wave, a square wave or any kind of wave onto the coil. I do not care about the precise waveform, I just need the frequency output. Any loose design that outputs any distorted waveform is acceptable.
3.The frequency output is between approximately 100Khz to around 2-3 Mhz. The exact range is not very important as long as it outputs within these range.
4. The device will sweep the output frequency from this range every 1 second or so. In other words, it will start to output at 100Khz and rapidly increase the frquency to 3 Mhz within 1 second or so. This precise period is not very important. It could be several seconds per sweep cycle.
5. I do not care about the efficiency, as long as I get 300W onto the coil. Any loose design that is inefficient will work, I am only concerned with the power level and the frequency.
6. I do not care about stray RF radiation. I will simply place this onto a metal cage that will provide some RF shielding.
7. I am not concerned about tolerances, matching, stability, precision, etc. Rough frequency and power is all that I need. In fact, the looser and the more "wild" the output is, the better for my envisioned application.


As you can probably tell from my questions, that I am not an expert in RF design, I am not even sure what I am asking for can be done, so please feel free to correct me.


Thanks
Jojo Jaro

Sorry, I meant 3 GHz not 3 Mhz.

Hi Jojo,

I am not an RF designer either so cannot really help in the design of RF power stages, except to comment that many power output stages involve tuned circuits to enable more simple switching to create sine waves. My personal expereince is only up to 100MHz at lower powers with fully digital systems.

I can, however, offer a little input from my DSP background to let you know (although I am sure that you are aware) that if you do go down a switched drive route (not a linear output stage) then although you may create waveforms of the fundamental frequency you want; they may be highly polluted with harmonics and circuit resonances. This may be completely unimportant to your experiment, but if you are looking for any resonant activity or reaction at the nuclear level then beware this may make your results harder to decipher and analyse.

Best wishes with your research - it is a noble cause.

Jeff

Jeff, thanks for the help.

Yes, applying a broad spectrum RF signal with tons and tons of harmonics may make deciphering the resonant frequency difficult later on. For now, I would like the harmonics to be there as this is a "broad" specdtrum approach; kindda a like shooting wildly in the dark hoping to hit your target the more wildly you shoot. This stage of the experiment is more concerned with identifying the reactants and catalysts. Once the catalyst has been properly identified, the RF signal can be refined until it is narrowed down to something specific that can be built onto a production reactor.

One problem at a time is the strategy I am following.