RADIO RECEIVERS QUIZ

Better linearity

Fewer tuned circuits

Much easier alignment

Greater limiting

Double spotting

Variable selectivity

Double conversion

The padder capacitor

Is created within the receiver itself

Is independent of the frequency to which the receiver is tuned

Is not rejected be the IF tuned circuits

Is due to insufficient adjacent channel rejection

Improving the effectiveness of the AGC

Reducing the effect of noise at low modulation depths

Reducing the effect of negative-peak clipping

Improving the selectivity of the receiver

Local oscillator frequency is normally double the IF

Local oscillator operates below the signal frequency

Mixer input must be tuned to the signal frequency

RF amplifier normally works at 455 kHz above the carrier frequency

900 kHz

2100 kHz

750 kHz

1650 kHz

Image frequency rejection is very good

The local oscillator need not be extremely stable

Tracking will be improved

The selectivity will be poor

Leak-type bias must be used

The circuit is always biased in class C, by virtue of the leak-type bias.

When the input increases past the threshold of the limiting, the gain decreases to keep the output constant.

The output must be tuned

stabilization against signal strength variations is provided

the linearity is worse than in phase discriminator

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

Single-sideband, full-carrier

Single-sideband, suppressed-carrier

Single-sideband, reduced-carrier

ISB