Telex 38109-977 manual Ifb

demodulation	. 97
desensing	. 87
Design of Matrix Intercom Systems	. 61
Design of Wireless Intercom Systems	. 95
Determining Intercom Needs	116
difference between a headset only station and the speaker station	. 14
digital four-wire control station	114
digitally synthesized, frequency agile system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
dimming	. 14
dipole	106
Directional antennas	106
Disadvantages of a Matrix system	. 57
distributed amplifier	. 11
dropout	100
ducking	. 14
dumb or unintelligent trunking	. 73
E
effective radiated power (ERP)	. 98
Effective Radiated Power or ERP	108
example of how multiple signals are time-sliced for use in a TDM system	. 51
Example of Interfacing a TW System to a Matrix System	. . 4
F
fade margin	. 98
FCC Code 47 CFR, Part 74	. 90
FCC rules	. 92
Five pin XLR - pin out	. 13
Fixed Trunking	. 72
Fixed vs. Mobile Requirements	115
Four pin XLR - pin out	. 13
Four-wire Case	120
Full Duplex	. . 8
full duplex	. 78

G

GPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

GPI (General Purpose Interface) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

GPI/O Implemented PTT (Push-To-Talk) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

H

Half-duplex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 Handie-Talkies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 Headset User Stations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Headsets and Earsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117, 120 History of Wireless Intercoms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 How Each System Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 hybrid designs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

I
IFB	. 5, 54
IFB Circuits	. . 124
IFB325 Talent User Station	. . 117
IFB828 IFB Power Supply	. . 122
Impedance Matching	. . 102
Installation	. . 109
Intelligent Trunking	74, 75
Intercom connector wiring	. . . 11
intercom matrix	. . . 81
Intercom systems	. . . . 1
Interconnecting Matrix, PL, and Wireless Systems	. . . 78
Interfacing	. . . 77
Interference	. . 100
intermod	. . . 93

2 H a n d b o o k o f I n t e r c o m S y s t e m s E n g i n e e r i n g