Meinberg GPS170 BGT User manual

MANUAL
GPS170 BGT
GPS Satellite Receiver
in rack mount enclosure
8th August 2013
Meinberg Radio Clocks GmbH & Co. KG

Front view (Frontansicht) GPS170 BGT
GPS 170
satellite controlled clock
NEXT INC
CLR
ACK
MENU
FAIL LOCK
NORMAL OPERATION
Mon , dd.mm.yyyy
UTC 12: 00 : 00 O
278 , 5 Hz + 93 , 0
ENGLISH 1. Power supply
2. GPS170 with:
- LC Display, 4 x 16 characters - Function buttons: MENU / CLR/ACK / NEXT / INC
- Status LED: FAIL / LOCK
DEUTSCH 1. Netzteil
2. GPS170 mit:
- LC Display, 4 x 16 Zeichen - Funktionstasten: MENU / CLR/ACK / NEXT / INC - Status LED: FAIL / LOCK
Ref
Time
Time
Service
Network
Alarm
12

Rear view (Rückansicht) GPS170 BGT
Made in Germany http://www.meinberg.de E-mail: [email protected]
Antenna
ENGLISH 1. Power supply connector
2. Serial Port COM 0 / COM 1, 9pin. D-SUB female
3. Pulses Out. / F.Synth. Time Capture, 9pin. D-SUB female
4. Error relay output, 3pin. DFK
5. GPS Antenna, N-type
DEUTSCH 1. Spannungsversorgung
2. Serielle Schnittstelle COM 0 / COM 1, 9pol. D-SUB Buchse
3. Pulsausgänge / F.Synth. / Time Capture, 9pol. D-SUB Buchse
4. Störmelderelaisausgang, 3pol. DFK
5. GPS Antenne, N-Norm
Ref
Time
Time
Service
Network
Alarm
1
5
COM 0
COM 1
16
59
16
59
24
Pulses Out.
Time
16
59
16
59
Capture
F. Synth.
Error
CO NC NO
RS-232
3

Table of Contents
1 Impressum 1
2 Safety instructions for building-in equipment 2
3 General Information GPS 3
4 The Modular System GPS170BGT 4
5 GPS170 Features 5
5.1 Time Zone and Daylight Saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.2 PulseandFrequencyOutputs..................................... 5
5.3 TimeCaptureInputs ......................................... 5
5.4 Asynchronous Serial Ports (optional 4x COM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.5 Programmable pulse (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.6 TimeCode(optional)......................................... 6
5.6.1 AbstractofTimeCode .................................... 6
5.6.2 BlockDiagramTimeCode .................................. 7
5.6.3 IRIGStandardFormat..................................... 8
5.6.4 AFNORStandardFormat................................... 9
5.6.5 Assignment of CF Segment in IEEE1344 Code . . . . . . . . . . . . . . . . . . . . . . . . 10
5.6.6 GeneratedTimeCodes .................................... 11
5.6.7 Selection of Generated Time Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.6.8 Outputs ............................................ 12
5.6.9 TechnicalData ........................................ 12
6 Installation 13
6.1 MountingtheGPSAntenna...................................... 13
6.1.1 Example:............................................ 13
6.1.2 Antenna Short-Circuit Assembly with surge voltage protection . . . . . . . . . . . . . . . 14
6.2 PoweringUptheSystem ....................................... 15
7 The Front Panel Layout 16
7.1 FAIL/LOCKLED .......................................... 16
7.2 LCDisplay............................................... 16
7.3 MENUKey .............................................. 17
7.4 CLR/ACKKey............................................. 17
7.5 NEXTKey............................................... 17
7.6 INCKey ................................................ 17
8 The Menus in Detail 18
8.1 RootMenu............................................... 18
8.2 MenuRECEIVERPOS......................................... 19
8.3 MenuSVCONSTELLATION..................................... 20
8.4 MenuSVPOSITION ......................................... 20
8.5 MenuUSERCAPTURE........................................ 20
8.6 MenuLOGEVENT .......................................... 21
8.7 MenuSETUP ............................................. 22
8.7.1 SETUP FREQUENCY OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8.7.2 SETUPENABLEOUTPUTS................................. 22
8.7.3 SETUPTIMEZONE ..................................... 23
8.7.4 SETUP DAYLIGHT SAV ON/OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.7.5 SETUP SERIAL PORT PARM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8.7.6 SETUP SERIAL STRING TYPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8.7.7 SETUP SERIAL STRING MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
0

Page 0
8.7.8 SETUP POUT X (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8.7.9 SETUP TIME CODE SETTINGS (optional) . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.7.10 SETUP INITIAL POSITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.7.11SETUPINITIALTIME .................................... 29
8.7.12INITUSERPARMS...................................... 30
8.7.13INITGPSPARMS....................................... 30
8.7.14FORCEBOOTMODE .................................... 30
8.7.15ANTENNACABLE...................................... 30
9 Firmware Updates 31
10 Skilled/Service-Personnel only: Replacing the Lithium Battery 32
11 Technical Specifications GPS170 33
11.1Oscillatorspecications ........................................ 35
11.2 Technical Specications GPS Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
11.3SignalDescriptionGPS170 ...................................... 37
11.4TimeStrings.............................................. 38
11.4.1 Format of the Meinberg Standard Time String . . . . . . . . . . . . . . . . . . . . . . . . 38
11.4.2 Format of the Meinberg GPS Time String . . . . . . . . . . . . . . . . . . . . . . . . . . 39
11.4.3 Format of the Meinberg Capture String . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
11.4.4 Format of the SAT Time String . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
11.4.5 Format of the Uni Erlangen String (NTP) . . . . . . . . . . . . . . . . . . . . . . . . . . 42
11.4.6 Format of the NMEA 0183 String (RMC) . . . . . . . . . . . . . . . . . . . . . . . . . . 44
11.4.7 Format of the NMEA 0183 String (GGA) . . . . . . . . . . . . . . . . . . . . . . . . . . 45
11.4.8 Format of the NMEA 0183 String (ZDA) . . . . . . . . . . . . . . . . . . . . . . . . . . 46
11.4.9 Format of the ABB SPA Time String . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
11.4.10Format of the Computime Time String . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
11.4.11Format of the RACAL standard Time String . . . . . . . . . . . . . . . . . . . . . . . . . 49
11.4.12Format of the SYSPLEX-1 Time String . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
11.4.13Format of the ION Time String . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
12 Menu Quick GPS170 Reference 52
13 Attachment: Technical Information 53
13.1SafetyInstructions........................................... 53
13.2 Technical Specications GPS170 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
13.3CE-Label................................................ 54
13.4RearPanelConnectors ........................................ 54
13.5BackRS232COM0COM1 ...................................... 55
13.6TimeCapture ............................................. 55
13.7PulsesOut/F.Synth. ........................................ 55
13.8ErrorRelay............................................... 56
13.9GPSAntenna ............................................. 57
13.10TheprogramGPSMON32....................................... 58
13.10.1SerialConnection ....................................... 58
13.10.2NetworkConnection...................................... 58
13.10.3OnlineHelp .......................................... 58
0 Date: 8th August 2013 GPS170 BGT

Page 1
1 Impressum
Meinberg Radio Clocks GmbH & Co. KG
Lange Wand 9, 31812 Bad Pyrmont - Germany
Phone: + 49 (0) 52 81 / 93 09 - 0
Fax: + 49 (0) 52 81 / 93 09 - 30
Internet: http://www.meinberg.de
Mail: [e-mail]
Date: 2012-01-02
GPS170 BGT Date: 8th August 2013 1

Page 2 2 Safety instructions for building-in equipment
2 Safety instructions for building-in equipment
This building-in equipment has been designed and tested in accordance with the requirements of Standard
IEC60950-1 "Safety of Information Technology Equipment, including Electrical Business Equipment".
During installation of the building-in equipment in an end application (i.e. rack) additional requirements in
accordance with Standard IEC60950-1 have to be taken into account.
• The building-in equipment is a class 1 - equipment and must be connected to an earthed outlet
(TN Power System).
• The building-in equipment has been evaluated for use in oce environment (pollution degree 2) and may be
only used in this environment. For use in rooms with a higher pollution degree more stringent requirements
are applicable.
• The building-in equipment may not be opened.
• Protection against re must be assured in the end application.
• The ventilation opening may not be covered.
• The equipment/building-in equipment was evaluated for use in a maximum ambient temperature of 40
◦
C.
• For safe operation the building-in equipment must be protected by max 16 A fuse in the power installation
system.
• Disconnection of the equipment from mains is done by pulling the mains plug.
!
2 Date: 8th August 2013 GPS170 BGT

Page 3
3 General Information GPS
The satellite receiver clock GPS170 has been designed to provide extremly precise time to its user. The clock has
been developed for applications where conventional radio controlled clocks cant meet the growing requirements
in precision. High precision available 24 hours a day around the whole world is the main feature of this system
which receives its information from the satellites of the Global Positioning System.
The Global Positioning System (GPS) is a satellite-based radio-positioning, navigation, and time-transfer sys-
tem. It was installed by the United States Departement of Defense and provides two levels of accuracy: The
Standard Positioning Service (SPS) and the Precise Positioning Service (PPS). While PPS is encrypted and only
available for authorized (military) users, SPS has been made available to the general public.
GPS is based on accurately measuring the propagation time of signals transmitted from satellites to the users
receiver. A nominal constellation of 24 satellites together with several active spares in six orbital planes 20000
km over ground provides a minimum of four satellites to be in view 24 hours a day at every point of the globe.
Four satellites need to be received simultaneously if both receiver position (x, y, z) and receiver clock oset from
GPS system time must be computed. All the satellites are monitored by control stations which determine the
exact orbit parameters as well as the clock oset of the satellites on-board atomic clocks. These parameters
are uploaded to the satellites and become part of a navigation message which is retransmitted by the satellites in
order to pass that information to the users receiver.
The high precision orbit parameters of a satellite are called ephemeris parameters whereas a reduced precision
subset of the ephemeris parameters is called a satellites almanac. While ephemeris parameters must be evaluated
to compute the receivers position and clock oset, almanac parameters are used to check which satellites are in
view from a given receiver position at a given time. Each satellite transmits its own set of ephemeris parameters
and almanac parameters of all existing satellites.
GPS170 BGT Date: 8th August 2013 3

Page 4 4 The Modular System GPS170BGT
4 The Modular System GPS170BGT
GPS170BGT is a set of equipment composed of a satellite controlled clock GPS170 together with a power supply
unit (see chapter power supply), both installed in a metal 19" Modular chassis and ready to operate. The inter-
faces provided by GPS170 are accessible via connectors in the rear panel of the case. Details of the components
are described below.
Made in Germany
http://www.meinberg.de E-mail: [email protected]
Antenna
COM 0
COM 1
16
59
16
59
Pulses Out.
Time
16
59
16
59
Capture
F. Synth.
Error
CO NC NO
RS-232
GPS 170
satellite controlled clock
NEXT INC
CLR
ACK
MENU
FAIL LOCK
NORMAL OPERATION
Mon , dd.mm.yyyy
UTC 12: 00 : 00 O
278 , 5 Hz + 93 , 0
GPS170 assembled in a 19 Inch Modular chassis (front view basic conguration GPS170 / BGT)
4 Date: 8th August 2013 GPS170 BGT

Page 5
5 GPS170 Features
The GPS170 hardware is a 100mm x 160mm microprocessor board. The 105mm wide front panel integrates
a 4 x 16 character LC display, two LED indicators and 4 push buttons. The receiver is connected to the an-
tenna/converter unit by a 50? coaxial cable (refer to "Mounting the Antenna"). The antenna/converter unit
is powered (DC insulation 1000VDC) via the antenna cable. As an option, an antenna splitter for up to four
receivers connected to one antenna is available.
GPS170 is using the "Standard Positioning Service" SPS. The navigation message coming in from the satel-
lites is decoded by GPS170s microprocessor in order to track the GPS system time. Compensation of the
RF signals propagation delay is done by automatical determination of the receivers position on the globe. A
correction value computed from the satellites navigation messages increases the accuracy of the boards oven
controlled master oscillator (OCXO) and automatically compensates the OCXOs aging. The last recent value is
restored from the battery buered memory at power-up.
The GPS170 provides dierent optional outputs, e.g. three progammable pulse outputs, modulated/unmodu-
lated time code output, and up to a total of four RS232 COM ports. Additionally, you can order the GPS170 with
dierent OCXOs (e.g. OCXO-LQ / MQ / HQ / DHQ or an external Rubidium) to match the required accuracy.
The hard- and software conguration of the clock is displayed if the NEXT key is pressed two times
from the root menu.
5.1 Time Zone and Daylight Saving
GPS system time diers from the universal time scale (UTC) by the number of leap seconds which have been
inserted into the UTC time scale since GPS was initiated in 1980. The current number of leap seconds is part of
the navigation message supplied by the satellites, so the internal real time of the GPS170 is based on UTC time
scale. Conversion to local time and annual daylight saving time can be done by the receiver's microprocessor if
the corresponding parameters are set up by the user.
5.2 Pulse and Frequency Outputs
The pulse generator of GPS170 generates pulses once per second (P_SEC) and once per minute (P_MIN).
Additionally, master frequencies of 10 MHz, 1 MHz and 100 kHz are derived from the OCXO. All the pulses are
available with TTL level at the rear connector. The included synthesizer generates a frequency from 1/8 Hz up to
10 MHz synchronous to the internal timing frame. The phase of this output can be shifted from -360
◦
to +360
◦
for frequencies less than 10 kHz. Both frequency and phase can be setup from the front panel or using the serial
port COM0. Synthesizer output is available at the rear connector as sine-wave output (F_SYNTH_SIN), with
TTL level (F_SYNTH) and via an open drain output (F_SYNTH_OD). The open drain output can be used to
drive an optocoupler when a low frequency is generated.
In the default mode of operation, pulse outputs and the synthesizer output are disabled until the receiver has
synchronized after power-up. However, the system can be congured to enable those outputs immediately after
power-up. An additional TTL output (TIME_SYN) reects the state of synchronization. This output switches
to TTL HIGH level when synchronization has been achieved and returns to TTL LOW level if not a single satellite
can be received or the receiver is forced to another mode of operation by the user.
5.3 Time Capture Inputs
Two time capture inputs called User Capture 0 and 1 are provided at the rear connector (CAP0 and CAP1) to
measure asynchronous time events. A falling TTL slope at one of these inputs lets the microprocessor save the
GPS170 BGT Date: 8th August 2013 5

Page 6 5 GPS170 Features
current real time in its capture buer. From the buer, capture events are transmitted via COM0 or COM1 and
displayed on LCD. The capture buer can hold more than 500 events, so either a burst of events with intervals
down to less than 1.5 msec can be recorded or a continuous stream of events at a lower rate depending on the
transmission speed of COM0 or COM1 can be measured.
The format of the output string is ASCII, see the technical specications at the end of this document for details.
If the capture buer is full a message "** capture buer full" is transmitted, if the interval between two captures
is too short the warning "** capture overrun" is being sent.
5.4 Asynchronous Serial Ports (optional 4x COM)
Four asynchronous serial RS232 interfaces (COM0 ... COM3) are available to the user. In the default mode
of operation, the serial outputs are disabled until the receiver has synchronized after power-up. However, the
system can be congured to enable those outputs immediately after power-up. Transmission speeds, framings
and mode of operation can be congured separately using the setup menu. COM0 is compatible with other radio
remote clocks made by Meinberg. It sends the time string either once per second, once per minute or on request
with ASCII ? only. Also the interfaces can be congured to transmit capture data either automatically when
available or on request. The format of the output strings is ASCII, see the technical specications at the end
of this document for details. A separate document with programming instructions can be requested dening a
binary data format which can be used to exchange parameters with GPS170 via COM0.
5.5 Programmable pulse (optional)
At the male connector Typ VG64 there are three programmable TTL outputs (Prog Pulse 0-2), which are arbi-
trarily programmable.
Other technical details are described at the end of this manual.
5.6 Time Code (optional)
5.6.1 Abstract of Time Code
The transmission of coded timing signals began to take on widespread importance in the early 1950s. Especially
the US missile and space programs were the forces behind the development of these time codes, which were used
for the correlation of data. The denition of time code formats was completely arbitrary and left to the individual
ideas of each design engineer. Hundreds of dierent time codes were formed, some of which were standardized
by the "Inter Range Instrumentation Group" (IRIG) in the early 60s.
Except these "IRIG Time Codes", other formats like NASA36, XR3 or 2137 are still in use. The board GPS170
however generates the IRIG-B, AFNOR NFS 87-500 code as well as IEEE1344 code which is an IRIG-B123 coded
extended by information for time zone, leap second and date. Other formats may be available on request.
A modulated IRIG-B (3Vpp into 50W) and an unmodulated DC level shift IRIG-B (TTL) signal are available
at the VG64 male connector of the module.
6 Date: 8th August 2013 GPS170 BGT

5.6 Time Code (optional) Page 7
5.6.2 Block Diagram Time Code
modulated time code modulated time code hgh active and low active
driver
50 Ω unbalanced
driver
TTL
D/A converter
modulator
digital
sinewave
generator
microcontroller
time code
EPLD
10 MHz
PPS
GPS170 BGT Date: 8th August 2013 7

Page 8 5 GPS170 Features
5.6.3 IRIG Standard Format
8 Date: 8th August 2013 GPS170 BGT

5.6 Time Code (optional) Page 9
5.6.4 AFNOR Standard Format
GPS170 BGT Date: 8th August 2013 9

Page 10 5 GPS170 Features
5.6.5 Assignment of CF Segment in IEEE1344 Code
Bit No. Designation Description
49 Position Identier P5
50 Year BCD encoded 1
51 Year BCD encoded 2 low nibble of BCD encoded year
52 Year BCD encoded 4
53 Year BCD encoded 8
54 empty, always zero
55 Year BCD encoded 10
56 Year BCD encoded 20 high nibble of BCD encoded year
57 Year BCD encoded 40
58 Year BCD encoded 80
59 Position Identier P6
60 LSP - Leap Second Pending set up to 59s before LS insertion
61 LS - Leap Second 0 = add leap second, 1 = delete leap second 1.)
62 DSP - Daylight Saving Pending set up to 59s before daylight saving changeover
63 DST - Daylight Saving Time set during daylight saving time
64 Timezone Oset Sign sign of TZ oset 0 = '+', 1 = '-'
65 TZ Oset binary encoded 1
66 TZ Oset binary encoded 2 Oset from IRIG time to UTC time.
67 TZ Oset binary encoded 4 Encoded IRIG time plus TZ Oset equals UTC at all times!
68 TZ Oset binary encoded 8
69 Position Identier P7
70 TZ Oset 0.5 hour set if additional half hour oset
71 TFOM Time gure of merit
72 TFOM Time gure of merit time gure of merit represents approximated clock error. 2.)
73 TFOM Time gure of merit 0x00 = clock locked, 0x0F = clock failed
74 TFOM Time gure of merit
75 PARITY parity on all preceding bits incl. IRIG-B time
1.) current rmware does not support leap deletion of leap seconds
2.) TFOM is cleared, when clock is synchronized rst after power up. see chapter Selection of generated timecode
10 Date: 8th August 2013 GPS170 BGT

5.6 Time Code (optional) Page 11
5.6.6 Generated Time Codes
The internal time code generator may be congured to produce various pulse width modulated IRIG-B or AFNOR
signals. Codes can be output via the front panel bre optic ports FO1.. . FO3.
a) B002: 100 pps, DCLS signal, no carrier
BCD time-of-year
b) B003: 100 pps, DCLS signal, no carrier
BCD time-of-year, SBS time-of-day
c) B006: 100 pps, DCLS Signal, no carrier
BCD time-of-year, Year
d) B007: 100 pps, DCLS Signal, no carrier
BCD time-of-year, Year, SBS time-of-day
e) AFNOR : Code according to NFS-87500, 100 pps, wave signal,
1kHz carrier frequency, BCD time-of-year, complete date,
SBS time-of-day, Signal level according to NFS-87500
f) IEEE1344: Code according to IEEE1344-1995, 100 pps, AM sine wave signal,
1kHz carrier frequency, BCD time-of-year, SBS time-of-day,
IEEE1344 extensions for date, timezone, daylight saving and
leap second in control functions (CF) segment.
(also see table 'Assignment of CF segment in IEEE1344 mode')
g) C37.118: C37.118(DC) Code acc. C37.118, 100 pps, no carrier, BCD time-of-year,
SBS time-of-day,C37.118 extensions for date, timezone, daylight
saving and leap second in control functions (CF) segment
( also see table `Assignment of CF segment in IEEE1344 mode' but
sign bit of local oset is inverted )
GPS170 BGT Date: 8th August 2013 11

Page 12 5 GPS170 Features
5.6.7 Selection of Generated Time Code
The time code to be generated can be selected by Menu Setup IRIG-settings or the GPS Monitorprogram
GPSMON32 (except Lantime models). DC-Level Shift Codes (PWM-signal) B00x and modulated sine wave
carrier B12x are always generated simultaneously. Both signals are provided at the VG64-Connector, i.e. if code
B132 is selected also code B002 is available. This applies for the codes AFNOR NFS 87-500 and IEEE1344 as well.
The TFOM eld in IEEE1344 code is set dependent on the 'already sync'ed' character ('#') which is sent
in the serial time telegram. This character is set, whenever the preconnected clock was not able to synchronize
after power up reset. The 'time gure of merit' (TFOM) eld is set as follows.
Clock synchronized once after power up: TFOM = 0000
Clock not synchronized after power up: TFOM = 1111
For testing purposes the output of TFOM in IEEE1344 mode can be disabled. The segment is set to all zeros
then.
5.6.8 Outputs
The module GPS170 provides modulated (AM) and unmodulated (DCLS) outputs. The format of the timecodes
is illustrated in the diagramms "IRIG-" and "AFNOR standard-format".
AM - Sine Wave Output
The amplitude-modulated carrier is available at the VG-connector pin 14a. The carrier frequency depends on
the code and has a value of 1 kHz (IRIG-B). The signal amplitude is 3 Vpp (MARK) and 1 Vpp (SPACE) into
50 Ohm. The encoding is made by the number of MARK-amplitudes during ten carrier waves. The following
agreements are valid:
a) binary "0": 2 MARK-amplitudes, 8 SPACE-amplitudes
b) binary "1": 5 MARK-amplitudes, 5 SPACE-amplitudes
c) position-identier: 8 MARK-amplitudes, 2 SPACE-amplitudes
DCLS Output
The pulse width DCLS signals shown in the diagramms "IRIG" and "AFNOR standard format" are coexistent to
the modulated output and is available at the VG connector pin 13a with TTL level.
5.6.9 Technical Data
OUTPUTS: Unbalanced AM-sine wave-signal:
3 VPP (MARK) / 1 VPP (SPACE) into 50 Ohm
DCLS signal: TTL
12 Date: 8th August 2013 GPS170 BGT

Page 13
6 Installation
6.1 Mounting the GPS Antenna
The GPS satellites are not stationary but circle round the globe in a period of about 12 hours. They can only be
received if no building is in the line-of-sight from the antenna to the satellite, so the antenna/converter unit must
be installed in a location from which as much of the sky as possible can be seen. The best reception is given
when the antenna has a free view of 8
◦
angular elevation above horizon. If this is not possible the antenna should
be installed with a mostly free view to the equator because of the satellite courses which are located between
latitudes of 55
◦
North and 55
◦
South. If even this is not possible problems occure especially when at least four
sattelites for positioning have to be found.
The antenna/converter unit can be mounted on a pole with a diameter up to 60 mm or at a wall. A 45
cm plastic tube, two holders for wall-mounting and clamps for pole-mounting are added to every GPS170. A
standard coaxial cable with 50 ohm impedance should be used to connect the antenna/converter unit to the
receiver. The maximum lenght of cable between antenna and receiver depends on the attenuation factor of the
used coaxial cable.
Up to four GPS170 receivers can be run with one antenna/converter unit by using the optional antenna diplexer.
The total length of one antenna line between antenna, diplexer and receiver must not be longer than the max.
lenght shown in the table above. The position of the diplexer in the antenna line does not matter.
High voltage protectors must be installed directly after reaching the indoors. The optional delivered protec-
tion kit is not for outdoor usage.
Note:
If the antenna cable was assembled by the user: before powering up the system, make sure that there is no
short-circuit between the inner and outer conductor of the antenna cable, because this could cause a fault of
GPS170.
6.1.1 Example:
Type of cable diameter Ø Attenuation at 100MHz max lenght.
[mm] [dB]/100m [m]
RG58/CU 5mm 17 300 (1)
RG213 10.5mm 7 700 (1)
(1)This specications are made for antenna/converter units produced after January, 2005
The values are typically ones; the exact ones are to nd out from the data sheet of the used cable
GPS170 BGT Date: 8th August 2013 13

Page 14 6 Installation
6.1.2 Antenna Short-Circuit Assembly with surge voltage protection
Optional a surge voltage protector for coaxial lines is available. The shield has to be connected to earth as short
as possible by using the included mounting bracket. Normally you connect the antenna converter directly with
the antenna cable to the system.
14 Date: 8th August 2013 GPS170 BGT