Radio Receivers
Three-point tracking is achieved with

The padder capacitor
Double conversion
Double spotting
Variable selectivity

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Radio Receivers
In a ratio detector

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

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Radio Receivers
Indicate the false statement in connection with communications receivers.

A product demodulator could be used for the reception of Morse code.
Double conversion is used to improve image rejection
Variable sensitivity is used to eliminate selective fading
The noise limiter cuts off the receiver’s output during a noise pulse.

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