Specifications

I-4 MDS 4790/9790 Series Installation and Operation Guide MDS 05-3438A01, Rev. E
Fresnel zone 96
front panel controls and indicators 26
front panel removal 13, 85
internal duplexer removal 89
LCD menu flowchart 57
LCD start-up screen 27
LED indicators, chassis mounted 77
LED indicators, front panel 26, 76
main transceiver and power supply removal 83
MAS network 3
MDS 4790A master station 1
mounting dimensions and bracket details 12
network-wide diagnostics 81
network-wide remote diagnostics setup 81
PC connected to the master station 28
PC diagnostic port cable 29
programming and control buttons 58
rear panel 18
repeater and polling-remote network 4
RJ-11 to DB-9 adapter cable 82
shipment contents 11
station arrangement 6
INIT command (reset customer-programmable settings) 43
InSite software, using to perform remote diagnostics 80
Installation
alarm contacts 23
antenna and feedline selection 8
audio connector 21
battery power, connecting 15
data connector 21
diagnostics port connection 21
feedline 17
interface wiring connections 17
interference 8
mounting 11
on-the-air test 7
planning 6–10
primary power, connecting 13
procedures 10–24
rack mounting 11
remote front panel mounting 12
requirements 6
site selection 7
tabletop mounting 11
terrain and signal strength 7
Installation planning
antenna height vs. theoretical radio horizon, illustrated 97
calculating path loss 98
earth curvature 97
fade margins 97
formulas for system planning 98
Fresnel zone clearance 96
Fresnel zone, illustrated 96
RF propagation 95
Internal duplexer
removing or re-installing 85, 89
removing, illustrated 89
K
KEY command (activate transmitter). See also DKEY
command 44
Key On Data screen 69
Keying
activate transmitter (KEY command). See also DKEY
command 44
activate transmitter (Manual Key screen) 68
de-key transmitter (DKEY command). See also KEY
command 41
de-key transmitter (Manual Key screen) 68
enable/disable continuous (CKEY command) 40
set/display mode (continuous, DCE) (Continuous Keying
screen) 68
set/display mode (key-on-data, key-on-RTS) (Key On Data
screen) 69
L
LCD 27
Backlight Intensity screen 72
diagnostics commands, table 63
Display Contrast screen 71
main screens 64
Menu Directory screen 64
menu flowchart 57
operating parameters commands, table 61
owner and radio information commands, table 63
screen descriptions 60–75
screens, navigation 58
set background brightness (Background Intensity
screen) 72
set character intensity (Display Contrast screen) 71
start-up screen, illustrated 27
toggle between display-only and configuration modes 59
toggle between display-only and radio configuration modes
(Access Level screen) 64
use in problem solving 78
using to set radio functions 60
LEDs, chassis mounted 77
access to 77
explanation of 77, 78
illustrated 77
use in problem solving 77
LEDs, front panel 26
explanation of 27
illustrated 26, 76
normal indications 24
use in problem solving 76
Left/right arrow buttons 58
LOG command (display/clear history of system events) 44
M
Maintenance
cooling fan 91
Manual Key screen 68
MAS operation 3
illustrated 3
Menu directory
displaying 59
displaying individual menu screens 59
illustrated 59
selecting a main menu item 59
selection arrow 58
Menu Directory screen 64
MODE command (display whether master or remote) 45
MODEL command (display radio model number) 45
Model number
display radio (PC command) 45
MODEM command (set signal type and modulation mode) 45
Modem screen 65
Modem, set/display internal speed (Modem screen) 65