A-006-05: Performance limitations - instability, image, spurious, etc.
What part of a superheterodyne receiver determines the image rejection ratio of the receiver?
What is the term for the reduction in receiver sensitivity caused by a strong signal near the received frequency?
Squelch gain rollback
What causes receiver desensitization?
Strong adjacent channel signals
Squelch gain adjusted too high
Squelch gain adjusted too low
Audio gain adjusted too low
What is one way receiver desensitization can be reduced?
Shield the receiver from the transmitter causing the problem
Decrease the receiver squelch gain
Increase the receiver bandwidth
Increase the transmitter audio gain
What causes intermodulation in an electronic circuit?
Nonlinear circuits or devices
Too little gain
Lack of neutralization
Which of the following is an important reason for using a VHF intermediate frequency in an HF receiver?
To move the image response far away from the filter passband
To provide a greater tuning range
To tune out cross-modulation distortion
To prevent the generation of spurious mixer products
Intermodulation distortion is produced by:
the mixing of more than one signal in the mixer of a superheterodyne receiver
the interaction of products from high-powered transmitters in the area
the high-voltage stages in the final amplifier of an amplitude or frequency-modulated transmitter
the mixing of more than one signal in the first or second intermediate frequency amplifiers of a receiver
Three of the following answers are direct causes of instability in a receiver. Choose the answer which is NOT a direct cause:
Poor stability in a receiver usually originates in the:
local oscillator and power supply
Poor dynamic range of a receiver can cause many problems when a strong signal appears within the front-end bandpass or even outside it. Which of the following is NOT caused as a direct result?
If a receiver mixes a 13.800-MHz VFO with a 14.255-MHz received signal to produce a 455-kHz intermediate frequency (IF) signal, what type of interference will a 13.345-MHz signal produce in the receiver?
● = Unseen
● = Weak
● = Review
● = Learned
● = Incorrect answer