How it Works | The Transmitter Flashcards
The modulator combines the signals from the radio an audio amplifiers by superimposing the amplified speech signal on the _F carrier with a ___.
R, transformer
Modulation is the process of imposing information onto a ___ wave by changing its characteristics.
carrier
An unmodulated signal travels ___ than a modulated one for the same power.
further
The Depth of Modulation is the extent to which the ___ wave is modulated by ___ ___
carrier, another frequency
When a wave is amplitude modulated, the carrier has its ___/___ varied according to the strength of an audio signal which is applied to it.
amplitude, power
AM suffers from ___ and lack of ___, man-made interference, and ___ static
noise, quality, precipitation
The lowest frequency where freedom of static is guaranteed is __ _HZ
30 MHz
When a carrier is modified by a frequency ___ than itself, a band of frequencies either side of the carrier are created. These bands are called ___bands.
lower, side
Sidebands are the equivalent of the ___ and ___ of the frequencies of the carrier and the modulator
sum difference
There is an ___ and a ___ sideband
upper lower
Single Sideband Transmission aims to suppress the carrier and one sideband, transmitting just the other one. It requires ___ the power with the signal taking up ___ space.
half, less
SSB has a ratio of _:1; __x the efficiency
4, 16
Frequency modulation changes the ___, rather than the ___
frequency amplitude
Frequency modulation does (not) suffer from man-made interference
not
The signal:noise ratio for FM is ___ than for AM, meaning that ___ power is required for the same quality.
lower less
