A-006-04: Detection, audio, automatic gain control
A-006-04-01:
What audio shaping network is added at an FM receiver to restore proportionally attenuated lower audio frequencies?
A de-emphasis network
A pre-emphasis network
An audio prescaler
A heterodyne suppressor
A-006-04-02:
What does a product detector do?
It mixes an incoming signal with a locally generated carrier
It provides local oscillations for input to a mixer
It amplifies and narrows band-pass frequencies
It detects cross-modulation products
A-006-04-03:
Distortion in a receiver that only affects strong signals usually indicates a defect in the:
AGC
IF amplifier
AF amplifier
RF amplifier
A-006-04-04:
In a superheterodyne receiver with AGC, as the strength of the signal increases, the AGC:
reduces the receiver gain
increases the receiver gain
distorts the signal
introduces limiting
A-006-04-05:
The amplified IF signal is applied to the ____________ stage in a superheterodyne receiver:
detector
RF amplifier
audio output
HFO
A-006-04-06:
The low-level output of a detector is:
applied to the AF amplifier
grounded via the chassis
fed directly to the speaker
applied to the RF amplifier
A-006-04-07:
The overall output of an AM/CW/SSB receiver can be adjusted by means of manual controls on the receiver or by use of a circuit known as:
automatic gain control
automatic frequency control
inverse gain control
automatic load control
A-006-04-08:
AGC voltage is applied to the:
RF and IF amplifiers
AF and IF amplifiers
RF and AF amplifiers
detector and AF amplifiers
A-006-04-09:
AGC is derived in a receiver from one of two circuits. Depending on the method used, it is called:
IF derived or audio derived
RF derived or audio derived
IF derived or RF derived
detector derived or audio derived
A-006-04-10:
In a superhetrodyne receiver, the output of an oscillator is connected to a transformer. What is the function of the transformer?
It provides coupling between the beat-frequency oscillator and the detector
It provides isolation between the high-frequency oscillator and the detector
It provides tuning for the output of the intermediate frequency amplifier
It provides tuning for the input of the intermediate frequency amplifier
A-006-04-11:
What circuit combines signals from an IF amplifier stage and a beat-frequency oscillator (BFO), to produce an audio signal?
A detector circuit
An AGC circuit
A power supply circuit
A VFO circuit
|
Color key:
|
|
● = Unseen
|
|
● = Weak
|
|
● = Review
|
|
● = Learned
|
|
● = Incorrect answer
|
