Canadian Advanced pool, section 5-06

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Subelement 5

Transmitters, Modulation and Processing

Section 5-06

FM transmitter, repeater circuits

5-06-01

If the signals of two repeater transmitters mix together in one or both of their final amplifiers and unwanted signals at the sum and difference frequencies of the original signals are generated, what is this called?

A.
Neutralization
Correct Answer
B.
Intermodulation interference
C.
Adjacent channel interference
D.
Amplifier desensitization

5-06-01

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5-06-02

How does intermodulation interference between two repeater transmitters usually occur?

A.
When the signals are reflected in phase by aircraft passing overhead
B.
When they are in close proximity and the signals cause feedback in one or both of their final amplifiers
Correct Answer
C.
When they are in close proximity and the signals mix in one or both of their final amplifiers
D.
When the signals are reflected out of phase by aircraft passing overhead

5-06-02

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5-06-03

How can intermodulation interference between two repeater transmitters in close proximity often be reduced or eliminated?

A.
By installing a low-pass filter in the antenna feed line
B.
By installing a high-pass filter in the antenna feed line
Correct Answer
C.
By installing a terminated circulator or ferrite isolator in the feed line to the transmitter and duplexer
D.
By using a Class C final amplifier with high driving power

5-06-03

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5-06-04

If a receiver tuned to 146.70 MHz receives an intermodulation product signal whenever a nearby transmitter transmits on 146.52, what are the two most likely frequencies for the other interfering signal?

A.
146.88 MHz and 146.34 MHz
B.
146.01 MHz and 147.30 MHz
C.
73.35 MHz and 239.40 MHz
Correct Answer
D.
146.34 MHz and 146.61 MHz

5-06-04

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5-06-05

What type of circuit varies the tuning of an amplifier tank circuit to produce FM signals?

Correct Answer
A.
A phase modulator
B.
A balanced modulator
C.
A double balanced mixer
D.
An audio modulator

5-06-05

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5-06-06

What audio shaping network is added at an FM transmitter to attenuate the lower audio frequencies?

A.
An audio prescaler
B.
A heterodyne suppressor
Correct Answer
C.
A pre-emphasis network
D.
A de-emphasis network

5-06-06

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5-06-07

Which type of filter would be best to use in a 2-metre repeater duplexer?

A.
A DSP filter
Correct Answer
B.
A cavity filter
C.
An L-C filter
D.
A crystal filter

5-06-07

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5-06-08

The characteristic difference between a phase modulator and a frequency modulator is:

Correct Answer
A.
pre-emphasis
B.
the centre frequency
C.
de-emphasis
D.
frequency inversion

5-06-08

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5-06-09

In most modern FM transmitters, to produce a better sound, a compressor and a clipper are placed:

A.
between the multiplier and the PA
B.
between the modulator and the oscillator
C.
in the microphone circuit, before the audio amplifier
Correct Answer
D.
between the audio amplifier and the modulator

5-06-09

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5-06-10

Three important parameters to be verified in an FM transmitter are:

Correct Answer
A.
linearity, frequency deviation and frequency stability
B.
distortion, bandwidth and sideband power
C.
modulation, pre-emphasis and carrier suppression
D.
frequency stability, de-emphasis and linearity

5-06-10

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5-06-11

For a repeater to operate automatically, the circuit that determines when to turn the transmitter on and off is the:

A.
limiter
Correct Answer
B.
carrier operated relay
C.
automatic identifier
D.
multiplier

5-06-11

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