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

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

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Radio Receivers
In a radio receiver with simple AGC

The highest AGC voltage is produced
The faster the AGC time constant the more accurate the output
The audio stage gain is normally controlled by the AGC
An increase in signal strength produces more AGC

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Radio Receivers
The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency

To permit easier tracking
To allow adequate frequency coverage without switching
Because otherwise an intermediate frequency could not be produced
To help the image frequency rejection

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