Indicate the false statement. The superheterodyne receiver replaced the TRF receiver because the latter suffered from Inadequate selectivity at high frequencies Gain variation over the frequency coverage range Instability Insufficient gain and sensitivity TRUE ANSWER : ? YOUR ANSWER : ?
A low ratio of the ac to the dc load impedance of a diode detector results in Poor AF response Negative-peak clipping Poor AGC operation Diagonal clipping TRUE ANSWER : ? YOUR ANSWER : ?
In a broadcast superheterodyne receiver, the 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 TRUE ANSWER : ? YOUR ANSWER : ?
To prevent overloading of the IF amplifier in a receiver, one should use Variable selectivity Squelch Double conversion Variable sensitivity TRUE ANSWER : ? YOUR ANSWER : ?
A superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is 2100 kHz 900 kHz 1650 kHz 750 kHz TRUE ANSWER : ? YOUR ANSWER : ?
The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency Because otherwise an intermediate frequency could not be produced To permit easier tracking To help the image frequency rejection To allow adequate frequency coverage without switching TRUE ANSWER : ? YOUR ANSWER : ?
One of the main functions of the RF amplifier in a superheterodyne receiver is to Permit better adjacent-channel rejection Provide improved tracking Increase the tuning range of the receiver Improve the rejection of the image frequency TRUE ANSWER : ? YOUR ANSWER : ?
Indicate which of the following circuits could not demodulate SSB: Balance modulator Phase discriminator Product modulator BFO TRUE ANSWER : ? YOUR ANSWER : ?
The controlled oscillator synthesizer is sometimes preferred over the direct one because Its frequency stability is better It is relatively free of spurious frequency It is a simpler piece of equipment It does not require crystal oscillator TRUE ANSWER : ? YOUR ANSWER : ?
Three-point tracking is achieved with Double spotting Double conversion Variable selectivity The padder capacitor TRUE ANSWER : ? YOUR ANSWER : ?