Re: Variable power control

Karl Heinz Kremer, K5KHK

There is an HP application note about PIN diode attenuators:

I was just about to recommend a PIN diode attenuator as well. The device used in this particular configuration reached it's end of life, and may be hard to get soon. There are alternatives:

The data sheet has a chart that shows insertion loss based on frequency and control voltage. 
Karl Heinz - K5KHK

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