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Building a Variable Frequency Emmiter.. HOW HARD?


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Hello, I have the need to build a frquency Emmiter that will be Powerful enough to operate at about 100 feet distance, be able to have an adjustable frequency from about 1khz to 1Mghz...  I would like to be able to input the desired frequency some way.  Would I be better off buying such a gadget if available or attempting to assemble it a little at a time...?  Thanks for any help

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