2015-G8B: Frequency mixing; multiplication; bandwidths of various modes; deviation; duty cycle
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?
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?
What is another term for the mixing of two RF signals?
What is the stage in a VHF FM transmitter that generates a harmonic of a lower frequency signal to reach the desired operating frequency?
What is the approximate bandwidth of a PACTOR3 signal at maximum data rate?
What is the total bandwidth of an FM phone transmission having 5 kHz deviation and 3 kHz modulating frequency?
What is the frequency deviation for a 12.21 MHz reactance modulated oscillator in a 5 kHz deviation, 146.52 MHz FM phone transmitter?
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
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
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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