GE MDS 4790M Installation And Operation Manual page 92

H
Half-power beamwidth, defined 7
Hardware, display revision level (HREV command) 35
Hexadecimal
alarm code display (Alarm Masks screen) 59
summarize alarms in (ALARM command) 28
use to classify events as major alarms (AMASK
command) 30
use to classify events as major alarms (NMASK
command) 36
values for major alarm conditions 29
values for minor alarm conditions 29
HREV command (display hardware revision level) 35
I
I/O ALR LED 22
Illustrations
antenna height vs. theoretical radio horizon 75
Antenna switch module removal 70
audio connections 20
bench test setup 65
data connector 17
DC power supply 14
diagnostics port J1 pin connections 19
Fresnel zone 74
front panel controls and indicators 21
front panel removal 13, 68
internal duplexer removal 69
LCD menu flowchart 46
LCD start-up screen 23
LED indicators 22, 63
main transceiver and power supply removal 67
MAS network 4
MDS 4790A master station 2
model number codes 6
mounting dimensions and bracket details 12
network-wide diagnostics 66
network-wide remote diagnostics setup 66
PC connected to the master station 23
PC diagnostic port cable 24
programming and control buttons 47
rear panel 17
repeater and polling-remote network 4
RJ-11 to DB-9 adapter cable 66
shipment contents 11
station arrangement 8
INIT command (reset customer-programmable settings) 35
Installation
alarm contacts and battery back-up connections 19
antenna and feedline selection 10
audio connector 20
battery power, connecting 14
data connector 17
diagnostics port connection 19
feedline 16
interface wiring connections 17
interference 9
mounting 12
on-the-air test 9
planning 8–??
primary power, connecting 13
procedures 11–21
quick start instructions. See inside front cover
rack mounting 12
I-4 MDS 4790M (MPT 1411) I/O Guide
remote front panel mounting 12
requirements 8
site selection 8
tabletop mounting 12
terrain and signal strength 9
Installation planning
antenna height vs. theoretical radio horizon, illustrated 75
calculating path loss 75
earth curvature 75
fade margins 75
formulas for system planning 76
Fresnel zone clearance 74
Fresnel zone, illustrated 74
RF propagation 74
Internal duplexer
removing or re-installing 68
removing, illustrated 69
K
kbps (kilobits-per-second), defined 7
KEY command (activate transmitter). See also DKEY
command 35
Key On Data screen 57
Keying
activate transmitter (KEY command). See also DKEY
command 35
activate transmitter (Manual Key screen) 56
de-key transmitter (DKEY command). See also KEY
command 33
de-key transmitter (Manual Key screen) 56
enable/disable continuous (CKEY command) 32
set/display mode (continuous, DCE) (Continuous Keying
screen) 56
set/display mode (key-on-data, key-on-RTS) (Key On Data
screen) 57
L
LCD 23
Backlight Intensity screen 59
diagnostics commands, table 52
Display Contrast screen 59
main screens 53
Menu Directory screen 53
menu flowchart 46
operating parameters commands, table 50
owner and radio information commands, table 52
screen descriptions 49–62
screens, navigation 47
set background brightness (Background Intensity
screen) 59
set character intensity (Display Contrast screen) 59
start-up screen 53
start-up screen, illustrated 23
toggle between display-only and configuration modes 48
toggle between display-only and radio configuration modes
(Access Level screen) 53
use in problem solving 64
using to set radio functions 48
LEDs 22
description, table 64
explanation of front panel 22
illustrated 22, 63
normal indications 21
use in problem solving 63
MDS 05-3628A01, Rev. B