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MDS 05-3438A01, Rev. E MDS 4790/9790 Series I/O Guide 99

Probability of System Fading

where:

FProb = probability of fading more than F

= terrain factor

• 4 is used for very smooth terrain, such as over water

• 1 is used for average terrain, with moderate roughness

• 0.25 is used for mountainous or very rough terrain

b = climate factor

• 0.5 is used for a hot, humid climate

• 0.25 is used for temperate or northern areas

• 0.125 is used for a very dry climate

ƒ = frequency in GHz

d = path length in km

F =fade margin in dB

FProb a b 6.0 10

7–

F–()10⁄

××××××=

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 119 120

MDS 4790/9790 Series 1
QUICK START GUIDE 2
TABLE OF CONTENTS 3
Copyright Notice 6
Operational Safety Notices 6
ESD Notice 8
Environmental Information 8
1.0 INTRODUCTION 9
2.0 PRODUCT DESCRIPTION 9
2.1 Network-Wide Diagnostics 10
2.3 Applications 11
2.4 Features 12
2.5 Accessories 13
3.0 INSTALLATION PLANNING 14
(Shown mounted to mast) 17
4.0 INSTALLATION PROCEDURES 18
4.2 Mounting the Radio 19
Figure 7. Mounting Dimensions 20
4.3 Primary Power 21
ON/OFF SWITCH 22
DC POWER INPUT 22
4.4 Backup Battery 23
Battery Reset Switch 24
(See Text) 24
Duplexer 24
ANT connector 26
(Most common arrangement) 26
TX and RX ports are the only 26
DATA PORT to prevent damage 28
Data Interface Connector—J3 30
Invisible place holder 30
5.0 START-UP AND OPERATION 32
5.2 Front Panel Indicators 33
Figure 24. LED Indicators 34
6.0 DIAGNOSTICS AND CONTROL 36
MDS P/N 97-1971A04 37
6.2 PC Command Summaries 38
For example: REPEATER 39
For example: REPEATER ON 39
PC COMMAND 42
FRONT PANEL 42
MENU DESCRIPTION 42
STAT (described on Page 52) 43
Major Alarm Event 45
Assignments 45
Alarm Sense ASENSE [HI/LO] 46
Battery Backup 46
Monitoring & Alarm 46
Data Interface Baud 46
Data Interface 47
Buffering 47
Event Log Date 49
Dekey Transmitter DKEY 49
Emphasis screen, Page 66 50
Hardware Revision 51
Initialize to Factory 51
Defaults 51
Manual Key screen, Page 68 52
Clear Logs screen, Page 75 52
4-WIRE AUDIO INTERFACE 53
Modem screen, Page 65 53
Alarm Masks screen, Page 71 53
Options Installed OPT 54
Owner’s Message OWM [xxxxx] 54
Owner’s Name OWN [xxxxx] 54
Received Signal 56
Strength Indicator 56
Remote Terminal 56
Receive Frequency RX [xxx] 57
Received Data Audio 57
Receive Pad screen, Page 71 58
Transmit Timeout screen 58
Serial Number screen, Page 74 58
Show Selected 59
Parameters 59
Signal-to-Noise 59
Unit’s Internal 61
Temperature 61
Transmit Timeout 62
Transmit Data Audio 62
Front Panel 64
This graphic points you 68
Table 17. dBm Vs. Watts 73
Clear-to-Send 74
Standby 77
Equipment 77
Transmit Level 78
[–20 to +3, AUTO] 78
Set Owner 80
7.0 LOCAL & NETWORK-WIDE 83
PROBLEM SOLVING 83
7.1 Local Problem-Solving 84
DTYPE ROOT command (Page 42) 88
DIAGNOSTICS port, an 89
8.0 REPLACING ASSEMBLIES 90
POWER SUPPLY 91
MAIN TRANSCEIVER 91
(P/N 28-1575Axx) 92
Backup Battery 92
POSSIBLE 94
EQUIPMENT 94
9.0 RADIO SOFTWARE UPGRADES 99
COOLING FAN 99
(Keep clear of dust) 99
AIR FLOW 99
9.2 Preparing for Download 100
10.0 TECHNICAL REFERENCE 101
±1.5 ppm 102
10.2 RF Propagation Planning 103
FProb a b 6.0 10 107
GLOSSARY 109
IN CASE OF DIFFICULTY 119

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