matt weber wrote:

The key isn't as much sensitivity of the receiver. That is seriously
limited by background noise anyway to something around .5 microvolts
unless you use synchronous detection. The game at Green Bank and the
others is the huge gain over an isotropic radiator the big dish gives.

If an 8 ft dish gives about 40 db, an 80 ft dish is about 60db, 800
foot dish (like Aericibo) 80 db gain over an isostropic radiator.
When you have 60db in the antenna system, ta picowatt becomes a
microwatt, and a microwatt turns into a watt.

Add to that a cryogenically cooled (liquid nitrogen) front-end (RF amp)
to greatly reduce the thermal noise from the componants in that circuit.


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