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2015-G8B: Frequency mixing; multiplication; bandwidths of various modes; deviation; duty cycle

2015-G8B01: What receiver stage combines a 14.250 MHz input signal with a 13.795 MHz oscillator signal to produce a 455 kHz intermediate frequency (IF) signal?





2015-G8B02: 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?

Image response

Quadrature noise

Mixer interference

Intermediate interference

2015-G8B03: What is another term for the mixing of two RF signals?




Phase inverting

2015-G8B04: What is the stage in a VHF FM transmitter that generates a harmonic of a lower frequency signal to reach the desired operating frequency?



Reactance modulator

Pre-emphasis network

2015-G8B05: What is the approximate bandwidth of a PACTOR3 signal at maximum data rate?

2300 Hz

31.5 Hz

500 Hz

1800 Hz

2015-G8B06: What is the total bandwidth of an FM phone transmission having 5 kHz deviation and 3 kHz modulating frequency?

16 kHz

3 kHz

5 kHz

8 kHz

2015-G8B07: What is the frequency deviation for a 12.21 MHz reactance modulated oscillator in a 5 kHz deviation, 146.52 MHz FM phone transmitter?

416.7 Hz

101.75 Hz

5 kHz

60 kHz

2015-G8B08: Why is it important to know the duty cycle of the mode you are using when transmitting?

Some modes have high duty cycles which could exceed the transmitter's average power rating.

To aid in tuning your transmitter

To allow time for the other station to break in during a transmission

All of these choices are correct

2015-G8B09: Why is it good to match receiver bandwidth to the bandwidth of the operating mode?

It results in the best signal to noise ratio

It is required by FCC rules

It minimizes power consumption in the receiver

It improves impedance matching of the antenna

2015-G8B10: What is the relationship between transmitted symbol rate and bandwidth?

Higher symbol rates require wider bandwidth

Symbol rate and bandwidth are not related

Lower symbol rates require wider bandwidth

Bandwidth is always half the symbol rate

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2015-G8A: Carriers and modulation: AM; FM; single sideband; modulation envelope; digital modulation; overmodulation
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