This manual describes installation, commissioning, usage, function, operation and maintenance of the Allgon AR
repeaters and the Allgon OMT32 software version R1A. The first part of the manual describes the repeater hardware and
the second part describes the OMT32 software.
Communication between Allgon AR repeaters and operators is carried out either by using Allgon OMT32 (Operation and
Maintenance Terminal), or Allgon OMS (Operation and Maintenance System), both developed by Allgon. OMT32 is
described in this manual. OMS is described in the Advanced Repeater OMS, User’s Manual.
Hardware and software mentioned in this manual are subjected to continuous development and improvement.
Consequently, there may be minor discrepancies between the information in the manual and the performance and design
of the hardware and software. Specifications, dimensions and other statements mentioned in this manual are subject to
change without notice.
In this system, the channel selective 900, 1800, and 1900 systems are called GSM, DCS and PCS respectively. These
systems may, however, have different names in different parts of the world.
In this manual, the ’<>’ brackets are used to indicate function keys contrary to a series of key strokes
’<Del>’ = the Del(ete) key, ’Del’ = D, e, l.
Allgon and its suppliers shall not be liable for any damages related to the software or hardware, or for any other damages whatsoever caused of the use of or
inability to use any Allgon product. This is applicable even if Allgon has been advised of the damage risk. Under any circumstances, Allgon’s entire liability
Microsoft and MS-DOS are registered trademarks of Microsoft Corporation. Windows and Windows NT are trademarks of Microsoft Corporation. Intel and
Pentium are registered trademarks of Intel Corporation. RocketPort is a registered trademark of Control Corporation. Sound Blaster is a registered
trademark of Creative Technology, Ltd. Hayes is a registered trademark of Hayes Microcomputer Products, Inc. Planet is a regi stered trademark of MSI,
Mobile Systems International. Teflon is a registered trademark of Du Pont. Other trademarks mentioned in this manual are trademarks or registered
shall be limited to replace such defective software or hardware which was originally purchased from Allgon.
trademarks of their respective owners.
This manual is produced by El, Tele & Maskin Ingenjörsfirma AB, Huddinge, Sweden. Printed in Sweden.
ALLGON System AB, Box 541, S-183 25 Täby, Sweden
Phone: +46 8 540 822 00 — Fax: +46 8 540 824 85
This manual or parts of it may not be reproduced without the written permission of Allgon System AB.
Infringements will be prosecuted. All rights reserved.
• 32 bit software for fast and reliable operation.
• OMT32 cannot longer be run under Windows 3.x.
• OMT32 is compatible with all repeaters – new ones as well as old ones
(old repeaters keep the original functionality).
• A new optional Repeater to Repeater Link feature is supported by
OMT32.
• Improved user interface with intuitive menu options and buttons.
• Simplified OMT32 database.
User’s Manual VD202 90/ENRev. 1A 1999-07xi
ALLGON System ABAR Repeaters & OMT32
A
bbreviations
Abbreviations used in this manual, in the software, and in the repeater:
AGCAutomatic Gain Control
ALIAlarm Interface board
AMPSAdvanced Mobile Phone Service
BCCHBroadcast Control Channel (GSM broadcast channel time slot)
BSBase Station, BS antenna = towards the base station
BSABand Selective Amplifier board for uplink or downlink band with fixed or
BSelBand Selective
CDMACode Division Multiple Access
CHAChannel Amplifier board with 2 channel selective uplink or downlink channels
CMBCombiner unit
CSACDMA Segment Amplifier board with 2 channel selective uplink or downlink
CSelChannel Selective
CUControl Unit board
CWContinuous Wave
DAMPSDigital Advanced Mobile Phone Service
DCDirectional Coupler
DCSDigital Communication System (same as PCN)
DIADistribution board
DLDownlink signal direction (from base station via repeater to mobile station)
DPXDuplex filter
EEPROMElectrical Erasable Programmable Read Only Memory
EGSMExtended Global System for Mobile communication
ETACSExtended Total Access Communication System
ETSIEuropean Telecommunications Standard Institute
GSMGlobal System for Mobile communication
HWHardware
LEDLight Emitting Diode
LNALow Noise Amplifier, uplink and downlink
MSMobile Station, MS antenna = towards the mobile station
MSCMobile Switching Center
NMTNordic Mobile Telephone system
OMSOperation and Maintenance System
OMS/PCDesktop or notebook with installed OMS software
OMT32Operation and Maintenance Terminal
OMT32/PC Desktop or notebook with installed OMT32 software
PAPower Amplifier board for uplink or downlink
PCNPersonal Communication Network (same as DCS)
PCSPersonal Communication System
PSUPower Supply Unit
PTFEPolytetrafluoro Ethylene (Teflon)
RCURemote Control Unit
RFRadio Frequency
RIARepeater to Repeater Interface Adapter
RSSIReceived Signal Strength Indication
RTCReal Time Clock
SWSoftware
TACSTotal Access Communication System
TDMATime Division Multiple Access
TMNDeTe Mobile Network
ULUplink signal direction (from mobile station via repeater to base station)
UPSUninterruptible Power Supply
adjustable band width
channels
User’s Manual VD202 90/ENRev. 1A 1999-07xii
ALLGON System ABAR Repeaters & OMT32Hardware
P
art 1 – Hardware
Part one of this manual describes the Allgon AR repeaters, i.e. the
hardware.
Part one includes Chapter 1 through Chapter 5.
The OMT32 software is described in part two of the manual, starting with
Chapter 6, OMT32 Installation.
User’s Manual VD202 90/ENRev. 1A 1999-07
ALLGON System ABAR Repeaters & OMT32Hardware – Safety
1
. Safety
Any personnel involved in installation, operation or service of the Allgon
repeaters must understand and obey the following:
• Allgon repeaters are designed to receive and amplify signals from one or
more base stations and retransmit the signals to one or more mobile
stations. Also, the repeaters are designed to receive signals from one or
more mobile stations, amplify and retransmit to the base stations. The
repeaters must be used exclusively for these purposes and nothing else.
• Repeaters supplied from the mains must be connected to grounded
outlets and in conformity with any local regulations.
• The power supply unit in repeaters supplied from the mains contains
dangerous voltage level, which can cause electric shock. Switch the
mains off prior to any work in such a repeater. Any local regulations
are to be followed when servicing repeaters.
Authorized service personnel only are allowed to service repeaters while
the mains is switched on.
BERYLLIUM OXIDE
HYDROGEN FLUORIDE
• The repeater cover must be secured in opened position, e.g. by tying it
up, at outdoor repeater work. Otherwise, the cover can be closed by the
wind and cause your fingers getting pinched or your head being hit.
• When working on a repeater on high ground, e.g. on a mast or pole, be
careful not to drop parts or the entire repeater. Falling parts can cause
serious personal injury.
• Any repeater, including this repeater, will generate radio signals and
thereby give rise to electromagnetic fields that may be hazardous to the
health of any person who is extensively exposed to the signals at the
immediate proximity of the repeater and the repeater antennas.
• The CHA channel board power transistors, the PA amplifier board
power transistors, and the combiners (CMB) contain beryllium oxide
(BeO) that is poisonous if present as dust or smoke which can be
inhaled. The power transistors mentioned are mounted with two
screws as opposed to other transistors.
Do not file, grind, machine, or treat these parts with acid.
Warning signs are applied on boards and units that contain beryllium
oxide. These warning signs are shown in the next section.
• The coaxial cable insulation is made of PTFE, polytetrafluoro ethylene,
that gives off small amounts of hydrogen fluoride when heated.
Hydrogen fluoride is poisonous. Do not use heating tools when
stripping off coaxial cable insulation.
No particular measures are to be taken in case of fire because the
emitted concentration of hydrogen fluoride is very low.
• A lithium battery is permanently mounted on the CU board. Due to
the risk of explosion, this battery must not be removed from the board.
In case of battery malfunction, replace the CU board. The old CU
board can be sent to Allgon for repair.
User’s Manual VD202 90/ENRev. 1A 1999-071 - 1
ALLGON System ABAR Repeaters & OMT32Hardware – Safety
Warning Signs
The following warning signs must be observed and be kept clean and
readable.
Beryllium oxide
This warning sign is applied on boards and units which contain beryllium
oxide parts.
Beryllium
oxide
hazard
BERYLLIUM OXIDE
(Toxic)
used in equipment
see instruction book
This warning sign is applied at the bottom, inside the cabinet, below the
power supply unit.
The previous section details parts containing beryllium oxide and how to
avoid dangerous dealing with these parts.
Static Electric ity
Static electricity means no risk of personal injury but it can severely
damage essential parts of the repeater, if not handled carefully.
Parts on the printed circuit boards as well as other parts in the repeater
are sensitive to electrostatic discharge.
Never touch printed circuit boards or uninsulated conductor
surfaces unless absolutely necessary.
If you must handle printed circuit boards or uninsulated conductor
surfaces, use ESD protective equipment, or first touch the repeater
chassis with your hand and then do not move your feet on the floor.
Never let your clothes touch printed circuit boards or uninsulated
conductor surfaces.
Always store printed circuit boards in ESD-safe bags.
User’s Manual VD202 90/ENRev. 1A 1999-071 - 2
ALLGON System ABAR Repeaters & OMT32Hardware – Introduction
2
. Introduction
Figure 2-1. Allgon AR Repeater
Allgon repeaters are used to fill out uncovered areas in cellular mobile
systems, such as base station fringe areas, road tunnels, business and
industrial buildings, etc.
A repeater receives signals from a base station, amplifies and retransmits
the signals to mobile stations. Also it receives, amplifies and retransmits
signals in the opposite direction. Both directions are served
simultaneously.
To be able to receive and transmit signals in both directions, the repeater
is connected to a donor antenna directed towards the base station and to
a service antenna directed towards the area to be covered.
Control of the repeaters is performed using a desktop or notebook loaded
with the Allgon OMT32, Operation and Maintenance Terminal, which can
communicate with the repeaters, either locally or remotely via modem.
Remote operation can be performed either via a traditional telephone line
or via a mobile phone that can be installed inside the repeater.
To be able to control many Allgon AR repeaters in common, there is an
Allgon OMS, Operation and Maintenance System.
The repeaters and the OMT32 is described in this manual. The OMS is
described in the Advanced Repeater OMS, User’s Manual.
User’s Manual VD202 90/ENRev. 1A 1999-072 - 1
ALLGON System ABAR Repeaters & OMT32Hardware – Introduction
Repeater Types
The following repeater types are available:
• Channel selective GSM repeater
• Channel selective CDMA repeater
• Band selective repeater with fixed band width
• Band selective repeater with adjustable band width
• Combined repeater
In the OMT32, the channel selective 900, 1800, and 1900 systems are
called GSM, DCS and PCS respectively, even though these systems may
have different names in other parts of the world.
Channel selective GSM repeater
A channel selective GSM repeater can be equipped with two, four, six or
eight channels. This repeater type is used for channel selective systems,
such as GSM, DCS/PCN and GSM 1900 (PCS).
Channel selective CDMA repeater
A channel selective CDMA repeater can be equipped with one or two
channels. This repeater type is used for digital code division systems in
accordance with IS-95 or J-std-008 standard.
Band selective repeater, fixed band width
A band selective repeater with fixed band width has fixed filters for a
certain band width. This repeater type is used for analog or digital
systems, such as NMT, TACS/ETACS, AMPS, DAMPS and CDMA.
Band selective repeater, adjustable band width
A band selective repeater with adjustable band width has filters that can
be set to various band widths. This repeater type is used for analog or
digital systems, such as NMT, TACS/ETACS, AMPS, DAMPS and CDMA.
Combined repeater
Some of the above mentioned types can be combined in the same repeater
chassis and be in operation in parallel.
User’s Manual VD202 90/ENRev. 1A 1999-072 - 2
ALLGON System ABAR Repeaters & OMT32Hardware – Introduction
Using Repeaters
In areas where the radio signal propagation is poor repeaters can be used
to fill out those areas which are not covered by the base station.
The following scenarios are examples on this:
- Sports arenas
- Fair halls
- Large shopping centres
- Road and railway tunnels
- Indoors in buildings with metal or concrete walls
Other examples where repeaters can be used to increase the coverage are:
- Shaded areas
- Fringe coverage areas
In areas where the traffic intensity is low, it is not cost efficient to install
a base station. An Allgon repeater, which can be installed with a
minimum of investments, is a much better solution. You save installation
costs as well as operational costs.
Examples of using repeaters
Two examples are described in the following sections. An outdoor example
in a shaded valley and an indoor example in a sports arena.
User’s Manual VD202 90/ENRev. 1A 1999-072 - 3
ALLGON System ABAR Repeaters & OMT32Hardware – Introduction
Shaded Area
A valley is shaded by hills. There is a base station 5 kilometers away, but
the lowest signal strength in the valley is less than –100dBm. A mast
used for other purposes is available for a repeater installation. The mast
height is 42 meter and it is located on a hill. The scenario is illustrated
in Figure 2-2.
Donor antenna
Service antenna
Figure 2-2. Repeater coverage of shaded area
The donor antenna of the repeater was mounted at the top of the mast
and the service antenna was mounted at the half mast. The antenna
isolation was measured to over 100dB. The repeater was set to max.
80dB gain.
Measured levels:Received signal level– 60.0 dBm
Donor antenna gain15.0 dBi
Cable loss
–
5.0 dB
Repeater input level– 50.0 dBm
Adjusted repeater gain70.0 dB
Repeater output level20.0 dBm
Cable loss– 5.0 dB
Service antenna gain8.0 dBi
Radiated output level23.0 dBm
The measured result in the valley was better than –90dBm.
User’s Manual VD202 90/ENRev. 1A 1999-072 - 4
ALLGON System ABAR Repeaters & OMT32Hardware – Introduction
Sports Arena
A 2000 spectators sports arena with metallic roof had an indoor signal
strength too low to provide a fair service in most parts of the arena. The
nearest base station was 8 kilometers away and it was equipped with one
carrier only.
A donor antenna directed towards the base station was mounted on a
mast outside the building and a repeater was installed inside the building
with the service antenna on the arch vault. The scenario is illustrated in
Figure 2-3.
Donor antenna
Service antenna
Figure 2-3. Repeater in sports arena
The antenna isolation was measured to over 85dB.
Measured levels:Received signal level– 80.0 dBm
Donor antenna gain15.0 dBi
Cable loss
–
5.0 dB
Repeater input level– 70.0 dBm
Adjusted repeater gain75.0 dB
Repeater output level5.0 dBm
Cable loss– 2.0 dB
Service antenna gain7.0 dBi
Radiated output level10.0 dBm
The signal strength was fair for service in the entire arena.
User’s Manual VD202 90/ENRev. 1A 1999-072 - 5
ALLGON System ABAR Repeaters & OMT32Hardware – Installation
3
. Installation
Before installation, read carefully Chapter 1, Safety.
Siting the Repeater
Allgon repeaters are designed for outdoor usage. However, humidity and
temperature changes may have affect on the reliability. A preferable site
for the repeater is thus indoor, in a tempered and ventilated room.
Sunshine
If a repeater is placed outdoor and can be exposed to direct sunshine, it is
essential that the air can circulate around the repeater with no obstacle.
The operating temperature must not exceed +55°C due to sunshine
exposure. A shelter must be used in this case.
Shelter
Allgon repeaters are designed with a weather proof outdoor case that can
be mounted without any kind of shelter from rain, snow or hail.
If a repeater is to be opened on the site when raining, snowing, or hailing
there must be some kind of permanent or temporary shelter. This is
applicable to gentle rainfall, snowfall or hail. Limitations for very bad
weather is found in the next section.
Allgon can provide a shelter designed for these repeaters. This shelter is
shown in Figure 3-1.
Outdoor Installation and Service Limitations
Sited outdoors, the repeater must not be opened for installation or
service at bad weather, such as:
- Intense rainfall, snowfall or hail
- Storm or high wind
- Extremely low or high temperature
- High humidity of the air
User’s Manual VD202 90/ENRev. 1A 1999-073 - 1
ALLGON System ABAR Repeaters & OMT32Hardware – Installation
Dimensions and Weights
The dimensions of the repeater, including the mounting bracket, is shown
in Figure 3-1. The repeater chassis consists of two main parts, a cabinet
in which the circuitry is housed, and a cover, which can be either a thin
cover or a large cover (see the figure) depending on the configuration.
110 (4.3")
530 (20.9")
520 (20.5"
ALLGON
440 (17.3")
Mounting
bracket
)
CabinetShelter
174 (6.9")
224 (8.8")
Figure 3-1. Repeater dimensions
Thin
cover
290 (11.4")
Large
cover
240 (9.4")
Approximately repeater weights
Channel selective repeater, four channels, thin cover ............ 21 kg (46 lbs)
Channel selective repeater, four channels, large cover ........... 25 kg (55 lbs)
Band selective repeater, thin cover .......................................... 21 kg (46 lbs)
Band selective repeater, large cover ......................................... 25 kg (55 lbs)
Channel/band selective combi repeater, large cover ............... 30 kg (66 lbs)
If the cover, for some reason, has to be lifted off the cabinet, disconnect
the interconnection cables, remove the hinge nuts, and lift the cover off.
This is not recommended in other than exceptional cases.
The cabinet and cover weights are, approximately, as follows:
Empty thin cover .......................................................................... 6 kg (13 lbs)
Empty large cover ...................................................................... 10 kg (22 lbs)
Equipped large cover .................................................................. 15 kg (33 lbs)
Equipped cabinet without cover ............................................... 15 kg (33 lbs)
User’s Manual VD202 90/ENRev. 1A 1999-073 - 2
ALLGON System ABAR Repeaters & OMT32Hardware – Installation
Mounting
An Allgon repeater is easy to mount using the provided mounting bracket,
which has Ø14mm (9/16") holes for 10mm (3/8") or 12mm (1/2") fixing
screws. Clamps with c-c measures of 90mm (3.5"), 135mm (5.3"), 144mm
(5.7"), 205mm (8.1"), 250mm (9.8"), and 300mm (11.8") can be used as
well. The vertical c-c measure for these are 411mm (16.2").
The mounting bracket is shown in the figure.
NOTE! There is a Ø14mm (9/16") single hole in the middle of the
mounting bracket, marked ’A’ in the figure, which is intended for a
locking screw, i.e. a screw which cannot be removed when the repeater is
put in the bracket.
Mount the repeater as follows:
1.Mount the provided bracket.
Normally, the repeater is mounted on a wall, pole, or mast. These
mounting cases are shown below.
Figure 3-2. Attaching the bracket to a wall
Figure 3-2 shows a bracket attachment to a wall using four fixing
screws and a locking screw.
User’s Manual VD202 90/ENRev. 1A 1999-073 - 3
ALLGON System ABAR Repeaters & OMT32Hardware – Installation
Figure 3-3. Attaching the bracket to a pole
Figure 3-3 shows a bracket attachment to a pole using two 144mm
(5.7") U-shaped clamps and a locking screw.
Figure 3-4. Attaching the bracket to a mast
Figure 3-4 shows a bracket attachment to a mast using two 300mm
(11.8") bar-shaped clamps and no locking screw.
User’s Manual VD202 90/ENRev. 1A 1999-073 - 4
ALLGON System ABAR Repeaters & OMT32Hardware – Installation
Figure 3-5. Attaching the repeater to the bracket
2.After attaching the bracket, hang the repeater on the upper supports
(see Figure 3-5) and use the screws for the lower ones.
There are locking cylinders that can be inserted and locked with a
key after the lower screws have been tightened (see Figure 3-5).
These prevents from unauthorized removal of the repeater.
3.Mount the donor antenna directed towards the base station antenna.
This antenna is marked ’BS’ in the repeater.
4.Mount the service antenna directed towards the area to be covered by
the repeater. This antenna is marked ’MS’ in the repeater.
User’s Manual VD202 90/ENRev. 1A 1999-073 - 5
ALLGON System ABAR Repeaters & OMT32Hardware – Installation
Connection
OUT
IN ATT +7V OUT1 OUT2
LNA
LOW
UL
LNA
DL
OUT
LOWIN+7V ATTOUT1 OUT2
These labels show the
GSM/NMT system
frequencies as an example.
DC
DPX
TEST
-30 dB
MS
-20 dB
ANT
DC
DPX
TEST
-30 dB
MS
-20 dB
ANT
Mains
MS
BS
Figure 3-6. MS and BS antenna connections
1.Connect the service antenna (MS) and donor antenna (BS) coaxial
cables (see Figure 3-6). N type female connectors are used in the
repeater.
The donor antenna (BS) is connected to the right in the cabinet, at
the ’BS TX xxx-xxxMHz’ label (xxx = system frequencies).
The service antenna (MS) is connected to the left in cabinet, at the
’MS TX xxx-xxxMHz’ label (xxx = system frequencies).
2.Mount the mains connector on the cable and plug in the connector in
the power supply unit, PSU.
For repeaters supplied from the mains, the mains outlet must be
grounded. Both the mains plugs of repeaters equipped with two power
supply units must be connected to outlets supplied from the same fuse.
User’s Manual VD202 90/ENRev. 1A 1999-073 - 6
ALLGON System ABAR Repeaters & OMT32Hardware – Installation
3.Connect external alarm sensors (burglary, fire, etc.) and other
external alarm equipment (optical or acoustic signal, etc.), if any.
Cables for this installation is taken through free strain relief
bushings on the bottom of the repeater, in the same way as the
mains cable and the antenna cables.
ALLGON
External
alarm sensors
External alarm is connected to the P33 alarm port located to the left
in the cabinet (see Figure 3-7 on page 3-9). Use a 15 pole D-sub male
connector.
The P33 port is described on page 3-11.
4.Connect the internal phone/modem unit for remote control of the
repeater, if any.
The modem and a power backup unit are integrated in an RCU,
ALLGON
Remote Control Unit, which is mounted downmost inside the cabinet,
in front of the PSU. The RCU is available in different types for
various systems, which is further detailed in the Optional section in
Chapter 13.
Battery
Modem
Power supply
This is a schematic figure.
The various RCU parts can
be integrated or configured
differently.
ALLGON
P32
Telephone line
Modem
The modem is connected to the P32 modem port (RS-232, V.24
interface) on the repeater located to the left in the cabinet (see
Figure 3-7 on page 3-9).
The P32 port is described on page 3-11.
The mobile phone antenna is connected to the MS –20dB port on the
BS directional coupler (DC) located to the right in the cabinet
(DC/BS), provided that the phone and the repeater operate in the
same system.
If an RCU is used, this is powered by the P27 auxiliary port located
to the left in the cabinet (see Figure 3-7 on page 3-9). Pin 2 and 3 of
the P27 port are interconnected with a jumper if not used. This
jumper must be removed before plugging the RCU connector to P27.
If the RCU is removed, the jumper between pin 2 and 3 on the P27
port must be reconnected. Otherwise, the CU and ALI boards will
have no voltage supply. Do not connect the jumper to another position
than between pin 2 and 3 on the P27 port.
The P27 port is described on page 3-10.
5.Connect a telephone line for remote control of the repeater, if any.
The telephone line is connected to a modem, which is connected to
the P32 modem port on the repeater.
The P32 port is described on page 3-11.
Use a free strain relief bushing at the bottom of the repeater for the
external telephone line cable.
User’s Manual VD202 90/ENRev. 1A 1999-073 - 7
ALLGON System ABAR Repeaters & OMT32Hardware – Installation
6.Connect the Repeater to Repeater Link cable, if this optional feature
is to be used. The R2R net cable is connected to the P34 Repeater to
Repeater Link port on the repeater via a connector board to the right
ALLGONALLGON
in the repeater.
The P34 Repeater to Repeater Link port is described on page 3-13.
A free strain relief bushing at the bottom of the repeater is used for
the external net cable.
Necessary information for a Repeater to Repeater Link installation is
found in the VD202 91/EN, R2R, Repeater to Repeater Link Kit,Installation Guide.
7.Connect a PC for controlling the repeater. A COM port on the PC is
connected to the P31 PC port (RS-232) located to the right in the
cabinet (see Figure 3-7 on page 3-9). Use the provided serial cable.
ALLGON
Port P31 is described on page 3-10.
Now, you can use the OMT32 program to set up and control the
repeater. The OMT32 program is described in part two of this
manual.
But first, check the connections made and commission the repeater as
described in Chapter 4.
User’s Manual VD202 90/ENRev. 1A 1999-073 - 8
ALLGON System ABAR Repeaters & OMT32Hardware – Installation
Connection Ports and Station Ground
The DIA distribution board provides most of the internal connection
between the repeater units, and to external ports. Connectors involved in
the installation are also located on the DIA board. These connectors are
described below. A complete DIA board connector list is found in the
Board and Unit Descriptions section in Chapter 5.
Station ground is detailed below as well.
OUT
IN ATT +7V OUT1 OUT2
LNA
LOW
UL
CMBCMB
DLUL
DPXDPX
MS
LNA
DL
OUT
LOWIN+7V ATTOUT1 OUT2
BS
P28
P34
P32
P33
P27
DC
DPX
TEST
-30 dB
MS
-20 dB
ANT
DC
DPX
TEST
-30 dB
MS
-20 dB
ANT
MSBS
Figure 3-7. Connection ports and station ground
P31
DC
MS
-20 dB
Station Ground
There is a station ground screw (M8) in the repeater marked with a
ground symbol (see Figure 3-7). This screw must be used only for station
grounding (if such ground is to be used).
User’s Manual VD202 90/ENRev. 1A 1999-073 - 9
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