Manual
Neon 2000 Family
Neon Remote Terminals (NRT)
2015F Globalstar Satellite NRT
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC
Rules in the U.S.A. These limits are designed to provide reasonable protection against harmful interference when the equipment
is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to
correct the interference at his own expense.
This equipment has been tested for compliance with European regulations as follows:
Application of Council Directive:
2004/108/EC
Standards to which Conformity is declared:
EN-61000-6-1:2001
EN-61000-4-2:1995
EN-61000-4-3:1995
EN-61000-4-4:1995
EN-61000-4-6:1996
ENV-50204:1995
Any changes or modifications to this equipment not expressly approved by the manufacturer Unidata Pty Ltd could void the
user’s authority to operate this equipment.
Revision History
File name/Revision
Date
Author & Change Details
25/09/2013
MP – Reformat for web site
28 05 2015
PC – Major Update
Unidata Manual - 2015F Globalstar Satellite NRT Family –
09 06 2015.docx
09 06 2015
PC – Reviewed
Unidata Manual - 2015F Globalstar Satellite NRT Family - 13 07 2015.docx
13 07 2015
PC – New Antenna
Unidata Manual - Neon 2000 Family Remote Terminals and Modules issue
4.0
Unidata Manual – 2015E Globalstar Satellite NRT Family 28 05 2015.docx
Checked/
approved
MS
Copyright © Unidata Pty Ltd 2000-2013. All rights reserved. No part of this publication may be reproduced, transmitted,
transcribed, stored in a retrieval system, or translated into any spoken or computer language, in any form or by any means.
Electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without prior written permission of Unidata Pty
Ltd 40 Ladner St, O’Connor Western Australia 6163.
Manual – 2015F Globalstar Satellite NRT
TABLE OF CONTENTS
1.0 Neon Technology and Modules Overview ........................................................................ 3 1.1 Typical Neon Measurement System ................................................................................... 4 1.2 The Internet ......................................................................................................................... 4 1.3 GSM .................................................................................................................................... 4 1.4 GPRS .................................................................................................................................. 4 1.5 3G ........................................................................................................................................ 5 1.6 Satellite Packet Data Service .............................................................................................. 5 1.7 NRT Internal Architecture .................................................................................................... 6 2.0 Summary of Neon Remote Terminals ............................................................................... 7 2.1 2015F Neon Remote Terminal – Satellite ........................................................................... 8 3.0 NRT LED indicator .............................................................................................................. 8 4.0 Globalstar NRT Setup and Test ....................................................................................... 10 4.1 Satellite NRT Site Installation ............................................................................................ 10 4.2 Globalstar Satellite Site Installation ................................................................................... 10 4.3 NRT Connections .............................................................................................................. 11 5.0 NRT Power Requirements ................................................................................................ 12 5.1 Internal Power ................................................................................................................... 12 5.2 External Power .................................................................................................................. 12 5.3 Battery Life Table .............................................................................................................. 12 6.0 NRT Commissioning ......................................................................................................... 13 6.1 NRT Powered On .............................................................................................................. 13 6.2 NRT Confirm Configuration ............................................................................................... 13 6.3 Globalstar Signal Strength and Registration ..................................................................... 14 6.4 NRT Initialisation ............................................................................................................... 16 7.0 Battery Testing .................................................................................................................. 18 7.1 Battery Check .................................................................................................................... 18 7.2 Battery Replacement ......................................................................................................... 18 8.0 Attaching an External Power Supply .............................................................................. 19 9.0 NRT Satellite Antenna Information .................................................................................. 20 9.1 Mounting Antennas On-Site .............................................................................................. 20 9.2 Modem Antenna Specifications ......................................................................................... 20 9.3 Antenna Dimensions and Weight ...................................................................................... 21 9.4 Antenna Depiction ............................................................................................................. 21 9.5 Antenna Cable Specifications ........................................................................................... 22 9.6 Calculating Antenna Cable Length ...................................................................................... 1 9.7 Mounting Antennas at the Field Site ................................................................................... 1 9.8 Finding a Good Antenna Location ....................................................................................... 1 Unidata Manual - 2015F Globalstar Satellite NRT Family - 13 07 2015.docx
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References
This manual should be read in conjunction with the associated StarlogV4 User Manual
which describes the setting up of logging schemes for NRT terminals as well as all other
Unidata Data loggers.
This manual should also be read in conjunction with the Neon Server Documentation which
is available in PDF form from the Unidata web site and is also available as help screens
within the Neon Server system.
The NRT Terminal User Manual, the StarlogV4 User Manual and the Neon Server User &
Administrator Documentation form part of the documentation suite for the overall Neon
System.
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1.0
NEON TECHNOLOGY AND MODULES OVERVIEW
Neon is a system for collecting measurements from field instruments and transmitting the
measurements to a central system for data recording, analysis, reporting and data transfer
to other external systems.
The Neon system also provides facilities for data collection, analysis, reporting and field
measurement equipment and management within specified areas as defined by the
system. Examples of this include country wide access, regional access and different
access levels according to the rights and privileges of users, e.g. supervisor level,
manager level, coordinator level and read only user level. The Neon System is suited to a
range of uses such as environmental monitoring of remote instrumentation and automated
industrial and utility metering.
The Neon system may be offered on a system basis, with the customer purchasing the
server and a software license from Unidata, or can be provided on an application service
basis where the customer pays a service fee for Unidata to run the application on a
Unidata central server.
Overview of the Neon System
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1.1
Typical Neon Measurement System
The figure above is an example of a Neon installation showing an NMM connected to a
Water Level Instrument. Every day the NMM will send a “packet” of information
containing the data in raw format via GSM / 3G to the Neon server. The Neon server
extracts the raw data from the packet. The data is then stored on a secure server until the
client accesses the data using a standard Web Browser.
1.2
The Internet
The Internet provides the transport mechanism between the Neon Servers and the
telecommunication provider gateways. This means that NMM units can be used
anywhere in the world.
1.3
GSM
GSM (Global System Mobile) is a cell phone standard developed for second-generation
(2G) digital cellular networks used by mobile phones in most parts of the world. GSM
provides the “backbone” upon which GPRS, voice and data communication travel.
1.4
GPRS
GPRS (General Packet Radio Service) is an IP-enabled cellular solution for urban
communications. The power requirements are low and the GPRS electronics are fully
integrated within the NMM. GPRS communications are generally available wherever
GSM communications are available.
By this means a logger or field instrument connected to a GPRS-enabled communications
device (such as a Neon NMM) can deliver data to any Internet connected computer.
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GPRS provides an always-connected service – i.e. there is no dial up required. Typically
the user pays for data use and not for time.
1.5
3G
3G is the third generation of mobile telecommunications technology.
faster information transfer rates.
1.6
3G provides for
Satellite Packet Data Service
There are several low earth orbit and equatorial orbit packet data service providers. The
NMM Satellite uses either the Globalstar system or the Inmarsat system.
The Globalstar system provides a service very similar to the Cellular based GSM GPRS
service except via a satellite network.
The Inmarsat system provides IP (Internet Protocol) connectivity via the international
Inmarsat GEO Satellite network from any location on the globe, except the Arctic and
Antarctica. The Inmarsat system is used by Ethernet models of NMM.
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1.7
NRT Internal Architecture
The NRT Internal architecture is shown below. It contains two discrete sections,
A LOGGER section where the terminal connects to the field transducers and the logging
scheme, scan rates and diagnostics are managed.
The StarlogV4 support software allows a user to generate a logger scheme which defines
transducer information, logging scan rates, logger interval etc and various engineering unit
definitions. These files are called, for example the LDR and KBD files.
A COMMUNICATOR section which deals with communications to the server. This section
contains, for example, a scheduler component and the modem component, either a
Cellular Network modem or a Satellite Network modem. The communicator manages
functions such as the reporting interval, the number of communications attempts per
communications session, etc.
The StarlogV4 support software allows a user to generate a configuration file for the
Communicator section, called an FPO file in which the user sets the required
communications parameters.
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2.0
SUMMARY OF NEON REMOTE TERMINALS
Neon Remote Terminals (NRT units) are small, ultra-low power microprocessor-based
devices designed to collect data from data loggers and SDI-12 instruments. This data is
then sent via Cellular Networks or Satellite packet data to a Neon server on a
programmed schedule or as required for alerts.
The NRT also incorporates a fully-programmable data logger so that simple analogue and
digital signals may be directly connected and recorded.
NRTs are classified according to the communications network over which they
communicate. That is as either: Terrestrial (Cellular), Satellite (Globalstar or Inmarsat) or
Ethernet.
There are many different models of Neon Metering Modules.



Plastic case models are referred to as Neon Remote Terminals (NMMs),
Plastic case models with an LCD are referred to as Neon Remote Modules
(NRMs) and
Metal enclosure models are referred to Neon Remote Terminals (NRTs).
This manual refers to all NMMs/NRMs/NRTs as NRTs because all 2015F’s are NRTs.
All Neon Remote Terminals are small self-contained units in compact cases that connect
to sensors in the field, collect readings from those sensors and transmit the collected data
to a central Neon server. The type of network over which the collected data is transmitted
varies from model to model.
The Neon central server system can be provided either on a Neon Data Service basis or
on a Neon Client System basis. Both provide a central computer system to monitor and
receive data from many Neon Remote Terminals in the field.
All Neon Remote Terminals are designed to automate collection of remote data from
environmental monitoring, industrial measurements and utility metering via a
communications network from any location within the network coverage area.
Fully bi-directional communications are possible via the Neon server. Data can be
collected directly and the Neon module can be programmed from any internet connection.
The Neon modules also support integrated logging or automated collection of data from
an external data logger.
All Neon Remote Terminals utilise built-in modems that support packet data. They have
long battery life and low operating costs through use of advanced microcontroller
technology.
All Neon Remote Terminals provide Input /Output functions as standard, including analog
and digital inputs and SDI-12 data logger interface. There is also Modbus support via a
partial implementation of the Modbus protocol, which allows for reading from and writing
to specific registers within the Modbus RTU on an RS485 connection. Further details are
available on request.
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2.1
2015F Neon Remote Terminal – Satellite
The 2015F NRT Satellite is a small selfcontained metal cased Neon Remote Terminal
that communicates with the Neon server via
the Globalstar satellite network.
3.0
NRT LED INDICATOR
The simplest indicator is the red LED which is visible in the window of the unit.
On first power on the LED will be brightly on (not flashing) for 10 seconds indicating the
unit is in the process of being reset. Do not interrupt this initial start-up process. If the
initial start-up is interrupted you should power down, wait a few minutes, and then power
up again.




Slow flashing bright LED. One flash per second indicates the NRT is
establishing a network connection via the internal modem. This process takes
approximately 10 to 20 seconds.
Fast flashing bright LED. 3 to 5 flashes per second indicate the PPP session is
running and the NRT is communicating through the internal modem to the host
server. If the NRT is programmed to hold the PPP session open all the time, i.e.
the always on mode, the LED will continue to flash at this rate.
Slow brief flashing (dim) LED. One dim flash every Scan Interval (typically every
5 seconds) indicates normal NRT operation (sleeping). No communication is in
progress. The NRT has been programmed to log data and will only establish
communications at the defined reporting interval with which it has been configured.
Very occasional bright single flash. This indicates the scheme is actively
logging rather than sleeping at that particular time. If you have a scheme which
has a 5 second Scan rate and a 1 minute Log Interval, you will see dim flashes
(indicating sleep) every 5 seconds (i.e. every scan interval), then one bright flash
on the minute, indicating that a log is in progress. This cycle repeats at the Log
Interval, hence the LED will brightly flash every 1 minute.
When the NRT periodically communicates with the Neon server, the LED will



slowly flash as it establishes a network connection, then
quickly flash while it actually communicates with the Neon server (uploads log
data, downloads its scheme, processes queued commands, etc), then
slowly flash as it disconnects from the network
The durations of each stage will vary according to the telemetry type of the NRT and how
much data is transferred between the NRT and Neon server.
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If an NRT has been configured on the Neon server to Auto Cold Boot, then after the 10
second start up illumination, the NRT will immediately start a normal comms cycle, as
previously described, following the normal slow flashing, fast flashing, slow flashing cycle.
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4.0
GLOBALSTAR NRT SETUP AND TEST
The NRT Satellite has an internal Globalstar/ Qualcomm Satellite modem specifically for
use on the Globalstar Satellite system. You will need to contact Globalstar in your region
and set up an account for use of the Globalstar service.
The Globalstar regional office will require the Electronic Serial Number of the modem and
may need to have the modem set up for the regional operating parameters Once the
Globalstar modem has been registered with Globalstar and the account has been set up
and the Electronic Serial number registered it is ready for use.
Attach receive and transmit antenna cables taking care not to bend / distort them to the
Globalstar satellite Modem. Note the antenna is an active one and is clearly marked with
TX and RX as are the cables. If you mix up the TX and RX cables you can damage the
antenna and modem, so take great care to check this.
4.1
Satellite NRT Site Installation
Take the complete NRT Satellite unit out of the building and set it up with a laptop
computer where there is a clear view of the sky. The installation site needs to be selected
to give the best unobstructed view of the sky, for Globalstar satellites, and an
unobstructed view of the satellite, if an Inmarsat system is being used. As far as possible,
there should be a minimum of trees and buildings restricting the clear view of the sky.
4.2
Globalstar Satellite Site Installation
The Globalstar satellites cross from one horizon to the other horizon in approximately 20
minutes, assuming a coverage view of the sky of 160 degrees, i.e. 80 degrees each side
of the vertical. Globalstar antennas should therefore be mounted horizontally, pointing
directly overhead.
If you only have an 80 degree view of the sky, i.e. 40 degree look angle from the vertical,
you may not see satellites for some time. Also you will only see a passing satellite for half
the horizon to horizon transit time, so you will only be able to see that particular satellite
for 10 minutes. These important factors need to be considered when installing the NRT
Satellite.
Also, Globalstar satellites do not always pass directly overhead. That is, they do not
always traverse 180 degrees of the sky. Typically they rise from one point on the horizon
and set via another that can be at any compass point. When a satellite rises and sets
only a few degrees apart on the horizon, it does not rise very high into the sky and will
only be visible for less than the maximum time.
However, there are multiple Globalstar satellites in orbit, so it is also possible for one
satellite to come into view before the first goes out of site, allowing for longer coverage. In
practice it is common for satellite sessions to last anywhere from a few minutes up to
around 40 minutes. NRTs only need a very small window (less than a minute) for the
satellite to be in view to allow for communications to complete. But it must be noted that
Globalstar satellites will not always be visible when it is time for the NRT to communicate
at its scheduled time with the Neon server. Globalstar coverage has improved greatly in
recent years but it is still not perfect.
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4.3
NRT Connections
NMM wiring connections are listed in the separate “Unidata Manual - NRT Family Cables
& Connection Supplement” companion document.
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5.0
NRT POWER REQUIREMENTS
5.1
Internal Power
The NRT Terminals can be powered by internal batteries and / or with an external battery
supply. The recommended batteries are SAFT Lithium batteries which are specified in
this manual. The Lithium batteries provide high inrush current required for modern cellular
hand phones.
The NRT Satellite has three Lithium Batteries for the internal battery supply.
5.2
External Power
If required the NMM can be powered by an external supply of 6 to 16VDC @ 2A peak
(while transmitting) and 25mA (while receiving) and 30uA while on standby. Unidata
recommends 12V 7.2AH SLA (Sealed Lead Acid) batteries as a good external supply.
External instrumentation must be separately powered if more than 500uA is required. The
download schedule is the largest consumer of power.
The Continuous Drain Equivalent rating can be used to size the external power
requirements and duration of external power supplies. However, external power sources
should have an additional 100uA at 12V or 50uA at 6V continuous drain added, (due to
parasitic losses in the NMM circuitry).
The decision to use an external power supply should be based on the projected or known
frequency of battery changes, i.e. if a high download schedule is required and frequent
battery replacement is going to prove difficult or expensive, then an external power supply
is desirable.
5.3
Battery Life Table
Approximate
NRT Terrestrial
Battery Life
Approximate
Download
Schedule
5 years
1 per day
5 secs
15 minutes
0.12 mA
4 years
4 times per
day
5 secs
15 minutes
0.21 mA
1 year
1 per hour
5 secs
15 minutes
0.53 mA
52 days
1 per 5
minutes
5 secs
1 minute
5.2 mA
5 seconds
26 mA
10 days
Approximate Approximate
Scan Rate
Log Interval
1 per minute
5 secs
Table 1
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Approximate
Continuous
Drain Equiv
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6.0
NRT COMMISSIONING
Once the NRT has been installed and all connections made, field commissioning can be
conducted. Ensure that a SIM card has been installed (see next section).
Commissioning tests may be performed as follows.
6.1
NRT Powered On
Confirm that the status LED, visible through the transparent window on the front of the
unit, is flashing. With the NRT in an idle state the LED will flash faintly once every
second.
6.2
NRT Confirm Configuration
Confirm proper configuration by connecting the NRT to a laptop computer running
StarlogV4.

Launch the STARLOGV4 (laptop computer) application.

Press the ‘Select’ icon and select the scheme corresponding to the NRT

Click on the ‘Configure/Initialise’ button to open the “NRT/NMM Configuration Tool”
dialog

Press the ‘Retrieve NRT Settings’ button at top right of the dialog

Confirm that the correct Server IP address has been configured

Confirm that the correct NRT ID (XRTID) has been configured

Check the firmware version and NRT Model type

If all checks are confirmed, the NRT may be Initialised
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6.3
Globalstar Signal Strength and Registration
Globalstar modems do not require a SIM card but must be properly configured before they
can register onto the Globalstar satellite network and allow the NRT to communicate with
the Neon server.
Registration, Signal Strength and other satellite network information may be checked by
using StarlogV4.
Globalstar modems do not really have signal strength. Instead they display a connection
state in place of RSSI. The connection state must be 3 or 4 before the modem can
connect to a satellite.
The procedure below shows some of the communications parameters that can be
checked using StarlogV4.

Reconnect to the NRT if not already connected.

Launch STARLOGV4 (laptop computer) application.

Press the ‘Select’ icon and select the scheme corresponding to the NRT

Click on the ‘Configure/Initialise’ button to open the “NRT/NMM Configuration Tool”
dialog

Press the ‘Retrieve NRT Settings’ button at top right of the dialog
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
Press the ‘Signal Strength’ button

Press the vertical ‘Show / Hide Logger Communications’ bar located along the right
edge of the configuration dialog. It is marked with a ‘>’ symbol.
After a short delay (10 seconds or so), the RSSI signal strength will be displayed.
RSSI must be 3 or 4 for the NRT to be able to connect to the satellite network.
You may need to leave the NRT satellite for 10 minutes for the satellite modem to
acquire one of the satellites and update the parameters.
The right dialog pane will display satellite network configuration information,
including Gateway number, RSSI and Registration status.
If the modem has been correctly registered onto the satellite network,
REGISTRATION will be ‘YES’. GATEWAY will change away from ‘-1’ to a satellite
gateway number.
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When it has been confirmed that the Globalstar modem has connected to the satellite
network, exit the Signal Strength option by pressing the Cancel button. You may then
exit the “NRT/NMM Configuration Tool” dialog by pressing the OK button at bottom right of
the dialog.
6.4
NRT Initialisation

Reconnect to the NRT if not already connected.

Launch STARLOGV4 (laptop computer) application.

Press the ‘Select’ icon and select the scheme corresponding to the NRT

Click on the ‘Configure/Initialise’ button to open the “NRT/NMM Configuration Tool”
dialog

Press the ‘Retrieve NRT Settings’ button at top right of the dialog

Press the ‘Initialise’ button
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
The NRT will attempt to communicate with the Neon server and initialise itself.
Once communications have been established, the NRT will download any required
scheme and configuration files and complete the initialisation process. The NRT should
respond with a PASS message after 2 or 4 minutes. Please be patient waiting for this
message.
Common Initialisation failure codes and their causes are illustrated in the table below
Once all commissioning tests have been completed successfully, the NRT is fieldcommissioned and ready for use.
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7.0
BATTERY TESTING
7.1
Battery Check
The presence of a battery can be verified without opening the NRT.
Look for the flashing LED through the window on the front of the NRT unit.
If the NRT is in an idle state, the LED will flash faintly once every second.
If the LED is not flashing, you will need to open the NRT and verify the presence of a
battery:
If a battery is installed and the LED is not flashing, the NRT will need to be initialised.
(See section on NRT Initialisation).
7.2
Battery Replacement
Always wait at least 1 minute between removing a battery and either replacing the same
battery or inserting a new battery. This is to allow any residual charge within the NRT to
dissipate.
The NRT battery should only be replaced with a SAFT LSH20. This is a spiral wound
Lithium Thionyl Chloride [Li-SOCl2] battery with a terminal voltage of 3.6 volts.
Failure to replace the battery with the correct type may cause communication failure.
For further information on the battery and where to purchase replacements, please refer
to www.saft.com
WARNING: Care should be taken when handling lithium batteries as misuse may cause
damage to the NRT or the battery cells may explode.
Ensure that the battery terminals are NOT shorted and that there are no loose wires in the
vicinity of the battery.
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8.0
ATTACHING AN EXTERNAL POWER SUPPLY
This section describes the procedure for attaching an external power supply to the NRT.
Remove the cover of the weatherproof enclosure and remove the NRT if a weatherproof
enclosure is provided.
Rubber self-sealing glands are provided in the base of the weatherproof enclosure for
external wiring connections. To keep the enclosure weatherproof, all wires leading to the
NRT must pass through these glands.
Connect the wires from the external power supply to the field termination strip.
connection points are +12V and GND.
The
Ensure all wires are firmly attached to the field termination strip and return the NRT to the
weatherproof enclosure.
Replace the cover of the weatherproof enclosure.
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9.0
NRT SATELLITE ANTENNA INFORMATION
9.1
Mounting Antennas On-Site
This section describes the Satellite Data Voice Module (SDVM, also called an Outdoor
Unit or ODU) hardware, including specifications for antennas and antenna cable. It also
describes how to calculate antenna cable length and mount antennas.
9.2
Modem Antenna Specifications
The GSP-1720 modem is to be used with an aluminium Satellite Data Voice Module
(SDVM), as shown in the figures below. The modem SDVM has a passive transmit and
an active receive section. The transmit (Tx) and receive (Rx) connectors are labelled on
the antenna.
Caution: You must be careful to connect the Tx connector on the SDVM to the Tx
connector on the modem, and the Rx connector on the SDVM to the Rx connector on the
modem. Crossing the Tx and Rx cables can damage the modem.
GAT-17QP SDVM Passive Antenna Showing Connectors
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9.3
Antenna Dimensions and Weight
The SDVM antenna is 105.56 millimetres diameter by 56.24 millimetres tall (4.156 inches
diameter by 2.214 inches tall).
The weight for the antenna is less than 213 grams (7.5 ounces).
9.4
Antenna Depiction
This section includes the following technical drawings that depict the antenna:
Note In the two figures above, dimensions are shown as: millimetres [inches]. Millimetres
are the controlling dimensions on these drawings.
Inch dimensions are for reference only.
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9.5
Antenna Cable Specifications
The SDVM antenna requires two (2) cables, one for transmit and one for receive:

The required connectors are: plug SMA (SDVM bulkhead) to plug SMA (Enclosure).

Transmit cable maximum 0.6 dB insertion loss @ 1618 MHz is required for the
cable.

Receive cable maximum 3.0 dB insertion loss @ 2492 MHz is required for the cable.

2015E comes with two internal cables:
- SMA Female ST BH (Enclosure) to SMA Female RA 160mm (Modem Rx) Red
- SMA Female ST BH (Enclosure) to SMA Male RA 160mm (Modem Tx) Yellow

And two 300mm long external cables:
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
9.6
Special length (1m, 2m, 3m) external cable can be ordered separately.
Calculating Antenna Cable Length
The maximum loss for an antenna cable of any length is 0.6 dB at 1.6 GHz for modem
transmit and 3 dB at 2.5 GHz for modem receive.
You must take these losses into account when calculating antenna lengths for a GSP1720 modem installation. For example, the GSP-1720 Modem Integrator’s Kit utilizes
three feet of LMR 195 cable, which has a loss of 0.6 dB at 1.6 GHz.
9.7
Mounting Antennas at the Field Site
When mounting an antenna on-site, you must position it properly to obtain Globalstar
satellite signals. You can mount the antenna on a flat surface or on a pole. In either case,
you should seal the antenna connectors against dirt and moisture.
Caution: The ODU antenna must be installed in a configuration that ensures a minimum
line-of-sight separation distance of 21.5 centimetres (8.5 inches) is maintained at all times
between the ODU antenna and any personnel.
9.8
Finding a Good Antenna Location
When installed in the field, the antenna of a GSP-1720 modem product must have a direct
line of sight to the Globalstar satellites. Keep in mind that Globalstar satellites follow
different paths across the sky, and you cannot predict where they will be.
Position the SDVM antenna outdoors where it has a clear view of the sky, unimpeded by
tall obstacles such as buildings and trees.
Signal fading associated with trees, buildings, and other obstacles that prevent a clear
line-of-sight to the satellite can cause degraded operation in a mobile environment.
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