Thursday, February 2, 2017

Do we have to impedance match the antenna to rf amplifiers?

We do not do this when we want to amplify the faintest signal from a microphone.


We use a step up transformer to feed an electron tube or JFET which have a high input impedance.


We are not interested in maximum power transfer. We are interested in maximum voltage and amplifying this.


Why not use the same principle on RF amplifiers?


Would the Pleiades battery electron tube front end preamplifier make a contribution to space communication?


Would the US Patent 1944574 on positive grid bias which shows that when the slope of grid current with respect to grid voltage curves gets negative we have regeneration, prove important if not already?


If there is life on the Pleiades star cluster would we able to communicate?


It takes about 300 years for a signal from there to arrive to earth.


How would we know at which frequency to tune to?


May we investigate the most efficient wavelength for this kind of communication, and then try to guess what this intelligence would have chosen as a wavelength that we could figure out from universal constants.


For example, we easily see 7 stars from the earth. Another constant is the distance, the speed of light. Could playing with the numbers enable us to find the right wavelength they had in mind aiding us to figure out?



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