TECHNICAL PRODUCT DATA SHEETS14WIIntelligent GPS Splitter

DESCRIPTIONThe S14WI can eliminate the cost of multiple antennas
and long cable runs in commercial or military GPS
installations. It is a high performance, intelligent GPS
signal splitter designed to meet the demanding
reliability requirements of commercial and military
applications. It can be configured to monitor the GPS
antenna current and provide an alarm indication if theantenna is not operating according to specifications.
The S14WI features a standard antenna DC bias
Pick-and-Choose circuit. This allows for the active
antenna DC input to be applied to any or all RF
outputs. With this feature, one DC voltage will bechosen to power the antenna while other inputs will beswitched to DC loads. If the selected DC bias input
should fail, the DC bias will automatically switch toanother DC input to ensure an uninterrupted supply tothe active antenna.
The S14WI is an amplified device with customer
defined gain. This allows greater flexibility in optimizing
performance for the application. It has an option for a
GPS filter on the input. This offers excellent selectivity
around the L1 band to prevent interference from otherhigh power radio frequency sources. Surge protection
is included on all five ports.
The S14WI is delivered in a sealed housing unit
sufficient for many years of operation in demanding
environments. The S14WI can be custom configured to
fit unique infrastructure requirements. Please contact
GPS Source for further information on product options
and specifications.

FEATURES







Amplified to Offset Splitter Losses
Optional Antenna Current Monitor and Alarm
Standard Antenna DC Bias SelectOptional GPS Filter
Pole-mount Environmental Housing Standard(IEC 529 level IP55)
Surge Protection Standard (Tested to EN61000-4-5)

S14WI Intelligent GPS Splitter Data Sheet
059-FSA-AGQ-AAS-AGZ-002
02/20/2020
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AS9100 and ISO 9001 Compliant Company

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S14WI Electrical Specifications
Table 1-1.

Electrical Specifications

Operating Temperature -40°C to 85°C
Parameter

Conditions

Min

Frequency Range

Ant: Any Port; Unused Ports: 50 (1)1.2

Filtered Option-15

Bandwidth (3dB)+/-50MHz, Ant Output

Gain (2)

Ant: Any Port; Unused Ports: 50
(Gain can be customized from 0dB to 12dB)

Input/Output SWR

All Ports 50 (1)Gain
Compression
Point (IP1dB)

Ant: Any Port; Unused Ports: 50
Filtered

3 OrderIntercept(IIP3)(Gain = 10dB)(1)

8

Unfiltered

Units

1.7

GHz

+15

MHz

10

dB
12

dB

2.0:1

—

2

dB

, Gain = 10dB

1565MHz < f < 1585MHz

-35

dBm

f < 1560MHz and f > 1591MHz

-25

dBm

-35

dBm

-23

dBm

Unfilteredrd1575.42

Max

45
(1)

Noise FigureTypf1 = 1600.42MHz
f2 = 1625.42MHz
2f1 – f2 = fL1

RF Input (Damage
Threshold)

1575MHz +/-50MHz, Ant. Input+10

Amp. Balance[OUT1 – OUT4] Ant: Any Port: Unused Ports: 50 (1)1dB

Phase Balance

Phase (OUT1 – OUT4) Ant: Any Port; Unused Ports: 50(1)1Degree

5

ns

Delay

Ant: Any Port; Unused Ports: 50

(1)

, L1

Isolation(Gain = 10dB)

Adjacent Ports: Ant – 50

(1)

Alternate Ports: Ant – 50

(1)

DC IN

DC Input on Any RF Output

Out-to-IN VDROP

Antenna Current of 30mA

Device Current

Current Consumption of Active Device(excludes Ant. Cur.)

Ant/Thru Current (3)Max Source DC Current Through Device

Antenna
Monitor

ICC

Range for Open Circuit Threshold

ISC

Range for Short Circuit Threshold (5)(5)

Surge Protection
Notes:

1.
2.
3.
4.
5.

8/20µs

35

dB

44

dB

4

12

VDC

50

mVpk-pk

20

mA

250

mA

15

25

mA

100

180

mA

18

4

KA

If the desired custom gain is greater than 10dB, for proper RF performance, the S14WI should have all RF ports
terminated into a 50 coaxial cable system or a 50 load.
Custom gain option available (from 0dB to 21dB).
Maximum current available from the DC source through the S14WI when output of S14WI is short circuited.
Open and short circuit current (IOC, ISC) can be specified by the customer within the specified range.
In-rush current shall not exceed 3A or exceed ISC for greater than 1ms.

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2

Performance Data

2.1

Unfiltered
Figure 2-1.

Unfiltered Frequency Response

S14WI Splitter — Unfiltered Frequency Response
Gain vs Frequency
50
40
30

Gain

20

(L2) 10.746 dB(L1) 10.615 dB

10

0
-10
-20
-30
1000

1100

1200

1300

1400

1500

1600

1700

1800

1900

2000

1900

2000

Frequency (MHz)Figure 2-2.

Unfiltered Input SWR

S14WI Splitter — Unfiltered Input SWR
SWR vs Frequency
10
9
8

SWR

7
6
5
4
3

(L2) 1.515 SWR

2(L1) 1.218 SWR

1
1000

1100

1200

1300

1400

1500

1600

1700

1800

Frequency (MHz)Page 3 of 11
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Figure 2-3.

Unfiltered Output SWR

S14WI Splitter — Unfiltered Output SWR
SWR vs Frequency
10
9
8
7
SWR

6
5
4
3
2

(L1) 1.468 SWR(L2) 1.170 SWR

1
1000

1100

1200

1300

1400

1500

1600

1700

1800

1900

2000

1900

2000

Frequency (MHz)Figure 2-4.

Adjacent Port Isolation

S14WI Splitter — Adjacent Port Isolation
Isolation vs Frequency
0-10Isolation (dB)

-20
-30

(L2) -43.025 dB-40(L1) -45.051 dB

-50
-60
-70
-80
1000

1100

1200

1300

1400

1500

1600

1700

1800

Frequency (MHz)Page 4 of 11
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Filtered Option
Figure 2-5.

Filtered Frequency Response

S14WI Splitter — Filtered Frequency Response
Gain vs Frequency
20(L1) 10.190 dB

10Gain (dB)

0
-10
-20
-30
-40
--50
1000

1100

1200

1300

1400

1500

1600

1700

1800

1900

2000

1900

2000

Frequency (MHz)Figure 2-6.

Filtered Input SWR

S14WI Splitter — Filtered Input SWR
SWR vs Frequency
16
14
12
10
SWR

2.2

8
6
4

(L1) 1.626 SWR

2
0
1000

1100

1200

1300

1400

1500

1600

1700

1800

Frequency (MHz)Page 5 of 11
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Operational Description

3.1

RF Signal Processing System
The RF signal processing system consists fundamentally of amplification stages and three classical Wilkinson
Splitter elements which divide the RF signal from the antenna input evenly between four RF output ports. There are
two options available concerning the RF Signal Processing System. These options are:
Filtered


3.2

Gain

Filtered Option
The S14WI is available with a filtered option which should be chosen if the S14WI is expected to operate in asevere EMI/EMC environment. The filtered option includes a low insertion loss pre-selection filter prior to the gainstages to protect the amplifiers from saturation and overload due to very strong out-of-band signals in the vicinity of
the S14WI (e.g. Cellular or PCS cell towers). It includes a high rejection filter after the gain stages which further
filter signals that are not strong enough to saturate the initial gain stages but can be strong enough to disrupt GPS
signal processing in the application receivers downstream.

3.3

Gain Option
In the Amplified High Isolation Configuration (standard), 50 signal attenuators are in the RF output paths toprovide additional isolation between each RF port. The S14WI does not require 50 terminations on unused ports
in order for the splitter to operate correctly. This standard configuration is chosen if it is possible for spurious
emissions from one GPS receiver on one port of the splitter to cause interference with GPS receivers connected toother output ports. The input port to any output port gain of the splitter is approximately 10dB. Additional
attenuation will result in higher port to port isolation.
The S14WI gain can be specified by the customer to have any input-to-output gain from 0dB to 21dB. If necessary,
the gain can be specified over this range independently for each individual port (e.g. The gain for ports 0, 1, and 2
can be specified to 0dB, while the gain for the remaining ports can be specified to 10dB).
To some extent, the port-to-port isolation performance is a function of the input-to-output gain. The port-to-port
isolation is maximized when the gain is 0dB or lower.

3.4

Termination of Unused Ports
If the desired custom gain is greater than 10dB, all ports should be terminated with 50 loads in order to ensure
proper operation of the Wilkinson Splitter elements. If all ports are not terminated properly, the S14WI Input/Output
SWR and Gain/Loss may not comply with specifications.
In the standard configuration, the 50 signal attenuators provide substantial isolation from open circuits onunterminated output ports. Consequently, RF outputs can be left unterminated without adversely affecting theoperation of the S14WI.

3.5

Antenna DC Bias SelectGPS Source RF signal splitters are unique relative to other generic RF signal splitters as they typically operate inconjunction with an active GPS antenna (a GPS antenna that includes an integrated Low Noise Amplifier).
Consequently, a GPS RF signal splitter must have provisions for managing the DC voltage to the active GPS
antenna.

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S14WI Intelligent GPS Splitter Data Sheet
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The S14WI splitter requires a DC voltage be applied to one or more of the RF output ports by way of the RFconnector center conductor. If DC voltages are applied to more than one of the RF output ports, the S14WI
pick-and-choose circuit will choose one of these DC inputs to power the active circuitry of the S14WI and will alsopass this DC voltage through the splitter to the center conductor of the RF input port. Ports without an external DC
voltage applied, or from which an external DC voltage is removed, are internally pulled-down to ensure that thefalse input voltage indications do not occur. The DC voltage available on the RF input port can be used to power
the application's active antenna.
The DC voltages applied to the RF outputs that are not chosen by the pick-and-choose circuitry will automaticallyswitch through an RF choke to 200 DC loads. The pick-and-choose circuit will always select the DC voltage on
the lowest numbered RF port that has a DC voltage applied to power the S14WI and the application’s antenna. If
the chosen DC input is removed or fails, the pick-and-choose circuit will automatically switch to the next higher
numbered RF port to which a DC voltage is applied.
Example 1: Assume DC voltages are applied to RF outputs 1, 3, and 4. In this scenario, the DC voltage on port 1
will be used to power the S14WI and the application antenna. Ports 3 and 4 will be switched to 200
DC loads.
Example 2: Now assume the DC voltage on port 1 is removed. The S14WI will automatically terminate the input
internally with a pull-down resistor and switch the operation of the splitter and antenna to the DC
voltage applied to the next high numbered port with a DC voltage applied, port 3. Port 4 will remainswitched to a 200 load.

3.6

Antenna Monitor and Alarm
The S14WI includes an option to monitor the status of the application's active antenna and to provide an alarmindication if the antenna's current is not within a specified range. The default current window for the S14WI is 15mA
to 150mA (e.g. below 15mA indicates an open circuit, and above 150mA indicates a short circuit); however, forlarge volume orders, the antenna current window can be specified to meet the customer's specific requirements.
The S14WI samples the antenna current 16 times per second. As long as the average of four samples are within
the current window, the S14WI will continue to operate normally, passing the DC voltage applied to lowest number
RF output on to the RF input. In this mode, DC voltages applied to the remaining RF outputs are switched to 200
DC loads. If the average of four antenna current samples fall outside of the antenna monitor current window, theDC voltage to the antenna is removed (open circuit), and all DC inputs are switch to Pass DC; however, since theDC path to the antenna has been opened, the DC current on all four DC inputs will be less than 5mA. In this alarm
condition, all GPS receivers connected to the RF outputs will also see very low antenna current draw, resulting incorresponding antenna alarm conditions within each receiver.
Once in the alarm condition, the S14WI will periodically (every 60 seconds) attempt to reconnect the DC power tothe antenna. If the antenna failure condition persists, the S14WI will re-enter the fault condition, repeating this cycle
until the fault condition is removed.

3.7

Surge Arrestor System
The S14WI includes standard Gas Discharge Tubes and Transient Voltage Suppressors on each RF input/output.
Furthermore, provisions for high current grounding are included in the metal enclosure of the device. The Surge
Arrestor System is intended to provide a limited capability to survive power line surges and voltage surges that canbe induced by near miss lightning strikes. Protection is rated to 4KA, according the IEC-61000-4-5. In order toensure proper protection of the device, the S14WI must be connected via a (8AWG minimum) ground cable to a
low impedance ground.

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S14WI Connectiono install the S14WI, connect the coaxial cable feeding the active GPS antenna prior to connecting the RF outputs.
Once the antenna coaxial cable is attached, coaxial cables with or without DC voltages can be connected to the
outputs.
At least one coaxial cable connected to any output of the device must provide a DC voltage suitablefor operating the active GPS antenna and the S14WI.

In some instances, upon initial connection of the DC voltage, the S14WI may power-up in the Antenna
Fault mode which will prevent the DC voltage from being applied to the active antenna.
If this behavior is observed immediately after power-up, wait for approximately one minute. Proper
operation should be restored by this time. If after one minute proper operation is not observed, ensurea known-good active GPS antenna that sinks a DC current within the specified range is connected to
the IN port of the S14WI via a known-good RF coaxial cable

5

Certifications and Approvals
Certifications and Approvals
EMC/Emissions

FCC part 15B and R&TTE equivalentPower Line Surge

IEC-61000-4-5

Safety/Low Voltage

EN60950-1

Environmental

IEC 60529, IP55

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6

Product Code Decoder
S 1 4 W I - A X X - X X - A M - F 1 - S F
Splitter
S14WI = 1x4 Wireless Splitter

Gain Option
A = Standard Configuration (10dB)
AS = Amplified as Specified (each port)
AXX = Custom Gain (0dB to 21dB)

Environmental Options
E = EMI Shielding
HS = Hermetically Sealed

Connector Option
NF
SF
TF
NM
SM
TM

=
=
=
=
=
=

N ........ Female
SMA .... Female
TNC ... Female
N ......... Male
SMA .... Male
TNC .... Male

Filtered Option
Blank = None
F1 = L1 Filtered

Antenna Monitor Option
Blank = None
AM = Add Antenna Monitor

Note:

To have product/part codes customized to meet exact needs, contact GPS Source at GPSS-Sales@gd-ms.com orvisit the website at www.gpssource.com.

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7

Mechanical Drawing
S14WI Intelligent GPS Splitter — FSA-AGQ-AAS-AGZ
4X

.18

[4X

4 mm]

2.2
[ 55 mm]
M6 X 1.0 SOCKET HEAD
CAP SCREW (5mm HEX)USE FOR GROUND LUG
ATTACHMENTPROTECTIVE WEATHERCAPS INCLUDED IN SHPPED ASM
5.1[129 mm]GROUND LUG INCLUDED IN SHIPPED ASM
ISOMETRIC VIEWFOR REFERENCE ONLY

4.8[122 mm]SERIAL NUMBER LABEL

4X THRU OR TAPPED HOLES FOR #8 SCREWS

5.100

2X .1

1.2
[30 mm]
3.3[84 mm]5.5[140 mm]
2.150

4.1[105 mm]

2.5[64 mm]RECOMMENDED MOUNTING PATTERN.6[16 mm]TOLERANCESUNLESS OTHERWISE SPECIFIEDLINEAR

1.3[32 mm]

Pb

±1º

DATE

05-06-14
CHECKEDQAUNLESS OTHERWISE SPECIFIEDDIMENSIONS ARE IN INCHESIAW ASME Y14.5M - 1994DATE

DESCRIPTION

05-06-14
MFG

N/A
GPS SOURCE PART NUMBER

N/A

DATE

05-06-14
APPROVEDFINISHTHE INFORMATION CONTAINED IN THIS DESIGN SET IS THE SOLE PROPERTY OF GPS SOURCE.
USE OF THIS DESIGN IS RESERVED EXCLUSIVELY FOR SAID COMPANY. REPRODUCTION OR DISTRIBUTION
OF ANY PORTION OF DESIGN IS FORBIDDEN WITHOUT THE EXPRESS WRITTEN CONSENT OFGPS SOURCE.

05-06-14

DATE

RADII

SEE LINEAR
MATERIAL

RoHS

DRAWN

ANGULAR

C
SCALE

REV

002
3RD ANGLE PROJECTION

1:1

MASS

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GPS Source

GPSS FILE NAME.

SIZE

DATE

05-06-14

COMPANY NAMEFSA-S14WI AMPLFD W/SRG SPPRSSN W/DC BIAS SELW/ANTENNA MNTR

S14WI Intelligent GPS Splitter Data Sheet
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SHEET

1 OF 1

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Colorado Springs, CO 80906
Phone: (+1)(719) 421.7300
Toll Free: (+1)(866) 289.4777
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www.gpssource.com
AS9100 and ISO 9001 Compliant Company

X X© 2013 GPS Source, Inc. All rights reserved.

GPS Source, Inc., GPS Live Inside, GPS Source logo, and other GPS Source, Inc. products, brands, and trademarks mentioned in this document are property of GPS Source, Inc. and/or its
affiliates in the United States and/or other countries. Other products, brands, and trademarks are property of their respective owners/companies. Any rights not expressly granted herein arereserved.
DISCLAIMER: The materials in this document could include inaccuracies or typographical errors and are subject to change at any time. The materials are provided “as is” without warranty of any
kind. To the maximum extent permitted by applicable law, GPS Source, Inc. and its suppliers hereby disclaim all warranties, either expressed or implied, and conditions with respect to thematerials, their quality, performance, suitability, merchantability, fitness for a particular purpose, title, and non-infringement. LIMITATION OF LIABILITY: IN NO EVENT WILL GPS SOURCE, INC.
AND ITS SUPPLIERS BE LIABLE FOR INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER IN AN ACTION OF CONTRACT OR TORT, ARISING OUT OF THE
USE OR INABILITY TO USE THE MATERIALS AVAILABLE IN THIS DOCUMENT, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. IN PARTICULAR AND WITHOUT
LIMITATION, GPS SOURCE, INC. SHALL HAVE NO LIABILITY FOR ANY LOSS OF USE, DATA, INCLUDING THE COSTS OF RECOVERING SUCH DATA, OR PROFITS.