On/off keying
Fax
AM
Product detection
The D layer.
The E layer.
The F layer.
None of the above.
AM
CW
FSK
USB
Sending the data at a slow rate of speed.
Maximizing the number of digital states.
Optimizing the range of colors sent.
Using pulse modulation.
The sensitivity of a receiver.
The selectivity of a receiver.
The dynamic range of a receiver.
The efficiency of a transmitter.
Sensitivity.
Noise figure.
Dynamic range.
Selectivity.
Spread-spectrum signals.
Time division multiplexed signals.
Narrowband AM signals.
Double sideband, suppressed carrier signals.
10 kHz
20 kHz
50 kHz
500 kHz
DSB
LSB
USB
AFSK
A ratio detector.
A D/A converter.
A product detector.
An envelope detector.
SSB signals
SSTV signals
Synchronized communications signals
Any of the above
Arrives in phase with the direct wave.
Arrives out of phase with the direct wave.
Arrives in a variable phase compared with the direct wave.
Is always horizontally polarized.
3 kHz
5 kHz
10 kHz
3 MHz
1.55 kHz.
15.5 kHz.
155 kHz.
1.55 MHz.
Local oscillator.
Product detector.
Front end.
Selectivity in the IF chain.
Offers better frequency stability.
Can provide faster data rates.
Reduces the number of receiving errors.
Forget it! On-off keying is just as good as FSK.
FDM
AFSK
PCM
None of the above
A ratio detector.
A discriminator.
An envelope detector.
A product detector.
An envelope detector.
A diode.
A ratio detector.
A product detector.
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