Radio Receivers
When a receiver has good blocking performance, this means that

Its image frequency rejection is poor
It does not suffer from double-spotting
Its detector suffers from burnout
It is unaffected by AGC derived from nearby transmissions

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Radio Receivers
In a ratio detector

stabilization against signal strength variations is provided
the circuit is the same as in a discriminator, except that the diodes are reversed
the output is twice that obtainable from a similar phase discriminator
the linearity is worse than in phase discriminator

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