B-8 PN: 10580-00321 Rev. M S331L UG
B-2 Glossary Terms Glossary of Terms
FM Modulation
Index : In FM modulated systems, the FM Modulation
Index is the ratio of the peak frequency deviation
to the maximum modulating frequency. The
higher the index, the greater the received quality.
FM Modulation Index = (peak frequency deviation
/ maximum modulation frequency)
FM Threshold : FM Threshold is the point at which the input
signal power is just strong enough to enable the
receiver demodulator circuitry to successfully
detect and recover a good quality television
picture from the incoming video carrier.
GHz : GigaHertz (GHz) is one billion (1 x 10E9) hertz,
which is a measurement of frequency.
GPS : The Global Positioning System (GPS) is a
space-based global navigation satellite system
(GNSS) that provides reliable location and time
information in all weather and at all times when
and where an unobstructed line of sight is
available to four or more GPS satellites. The
system is maintained by the United States
government and is freely accessible by anyone
with a GPS receiver. The Global Positioning
System is making it possible for people using
ground receivers to determine their geographic
location within 10 to 100 meters. The satellites
use simple mathematical calculations to broadcast
information that is translated as longitude,
latitude, and altitude by Earth-based receivers.
IF : Intermediate Frequency (IF) is a frequency to
which a carrier frequency is shifted as an
intermediate step in transmission or reception. An
intermediate electromagnetic frequency is
generated by a superheterodyne radio receiver.
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