3-F-048: Detectors
3-48F1:
What is a product detector?
It uses a mixing process with a locally generated carrier.
It provides local oscillations for input to the mixer.
It amplifies and narrows the band-pass frequencies.
It is used to detect cross-modulation products.
3-48F2:
Which circuit is used to detect FM-phone signals?
Frequency discriminator.
Balanced modulator.
Product detector.
Phase splitter.
3-48F3:
What is the process of detection in a radio diode detector circuit?
Rectification and filtering of RF.
Breakdown of the Zener voltage.
Mixing with noise in the transition region of the diode.
The change of reactance in the diode with respect to frequency.
3-48F4:
What is a frequency discriminator in a radio receiver?
A circuit for detecting FM signals.
A circuit for filtering two closely adjacent signals.
An automatic band switching circuit.
An FM generator.
3-48F5:
In a CTCSS controlled FM receiver, the CTCSS tone is filtered out after the:
Discriminator but before the audio section.
IF stage but before the mixer.
Mixer but before the IF.
IF but before the discriminator.
3-48F6:
What is the definition of detection in a radio receiver?
The recovery of intelligence from the modulated RF signal.
The process of masking out the intelligence on a received carrier to make an S-meter operational.
The modulation of a carrier.
The mixing of noise with the received signal.
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