TECHNICAL PRODUCT DATA SHEET

S14GT
4 Port GPS Timing Reference Splitter

DESCRIPTIONThe S14GT has been specifically designed for the
Wireless Industry. Built to eliminate the cost of multiple
antennas and long cable runs in wireless installations,
it makes it possible to use a single GPS referencing
antenna and cable arrangement for multiple
synchronized systems.
The S14GT features an antenna DC bias
select circuit. This allows for the active antenna DC
input to be applied to any or all RF outputs. With thisfeature, one DC voltage will be chosen to power theantenna while other inputs will be switched to DC
blocked outputs with 200 Ohm resistive loads toground. Designed for redundancy, if the selected DCbias input should fail or is removed, the DC bias willautomatically switch to another DC input to ensure an
uninterrupted supply to the active antenna.
The S14GT is an amplified device that is configured for
00dB or 10dB gain.

FEATURES
Amplified to Offset Splitter Losses
Standard Antenna DC Bias Select RoHS/REACH/WEEE Compliant
S14GT Data Sheet
059-FSA-ALQ-AAS-AGZ-003
04/17/2020
www.gpssource.com

AS9100 and ISO 9001 Compliant Company

1S14GT Electrical Specifications
Table 1-1.

Electrical Specifications

Operating Temperature -40°C to 85°C
ParameterConditions

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

1.100dB

Gain

10dB

Ant: Any Port; Unused Ports: 50

TypMaxUnits

1.7GHz-30+37

1013

Input/Output SWR

All Ports 50

Noise Figure

Ant: Any Port; Unused Ports: 50, Gain = 0dB

Gain Compression Point(IP1dB)

Gain = 0dB-35dBm

3rd Order Intercept (IIP3)(Gain = 0dB)

f1 = 1600.42MHz
f2 = 1625.42MHz2f1 - f1 = fL1-24dBm

RF Input (DamageThreshold)

Max RF Input Without Damage0dBm

Amp. Balance[J1 – J2] Ant: Any Port: Unused Ports: 50

1dB

Phase Balance

Phase (J1 – J2) Ant: Any Port; Unused Ports: 50

1Degree

Delay - Amplified

Ant: Any Port; Unused Ports: 50, L1

5ns

Isolation - Amplified(Gain = 0dB)

Adjacent Ports: Ant – 50

30dB

Opposite Ports: Ant – 50

40dB

DC IN

DC Input on any RF Output

3.3

Device Current

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

Ant/Thru Current (2)Max Source DC Current Through Device

Notes:1.
2.

2:0:1

dB—218dB

12VDC

20mA250mAFrequency range includes GPS L1, GLONASS L1, GALILEO E1Maximum current available from the DC source through the S14GT when output of S14GT is short circuited.

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S14GT Data Sheet
059-FSA-ALQ-AAS-AGZ-003
04/17/2020

2Performance Data

2.1
Figure 2-1.

Frequency Response (10dB)

S14GT Splitter
GAIN vs. Frequency
403020(L1) 11.019 dB(L2) 10.056 dB
Gain (dB)

100-10-201000

1100

1200

1300

1400

1500

1600

1700

1800

1900

2000

Frequency (MHz)Figure 2-2.

Input SWR (10dB)

S14GT Splitter - Input SWR
SWR vs. Frequency

1098SWR

765432(L2) 1.142 SWR

11000

1200(L1) 1.298 SWR

1400

1600

1800

2000

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

Output SWR (10dB)
S14GT
SWR vs. Frequency

10.00
9.00
8.00

SWR

7.00
6.00
5.00
4.00
3.00
2.00(L1) 1.350 SWR(L2) 1.156 SWR

1.00
1000

1200

1400

1600

1800

2000

Frequency (MHz)Figure 2-4.

Frequency Response (0dB)

S14GT
GAIN vs. Frequency
4030Gain (dB )2010(L1) 1.271 dB(L2) 1.041 dB
0-10-20
1000

1100

1200

1300

1400

1500

1600

1700

1800

1900

Frequency (MHz)Page 4 of 11
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S14GT Data Sheet
059-FSA-ALQ-AAS-AGZ-003
04/17/2020

2000

Figure 2-5.

Input SWR (0dB)
S14GT - Input SWR
SWR vs. Frequency

1098SWR

765432(L2) 1.119 SWR110001200(L1) 1.246 SWR
1400

1600

1800

2000

1800

2000

Frequency (MHz)Figure 2-6.

Output SWR (0dB)
S14GT - Output SWR
SWR vs. Frequency

1098SWR

76543211000(L1) 1.384 SWR(L2) 1.217 SWR

1200

1400

1600
Frequency (MHz)Page 5 of 11
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3

Operational Description

3.1

RF Signal Processing System
The RF signal processing system consists fundamentally of amplification stages and classical Wilkinson Splitterelements which divide the RF signal from the antenna input evenly between four RF output ports. The standard
gain is 00dB.

3.2

Gain Option
In the Amplified High Isolation Configuration (standard 00dB), 50 signal attenuators are in the RF output paths toprovide additional isolation between each RF port. The S14GT 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.
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 00dB.

3.3

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 GPSantenna.
The S14GT 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 S14GT
DC bias select circuit will choose one of these DC inputs to power the active circuitry of the S14GT 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 DC bias select circuitry will automaticallyswitch through an RF choke to 200 DC loads. The DC bias select circuit will always select the DC voltage on thelowest numbered RF port that has a DC voltage applied to power the S14GT and the application’s antenna. If thechosen DC input is removed or fails, the DC bias select 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 S14GT 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 S14GT 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.

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S14GT Data Sheet
059-FSA-ALQ-AAS-AGZ-003
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4

S14GT Connection
To install the S14GT, 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 theoutputs.
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 S14GT.

5Certifications and Approvals
Certifications and Approvals
EMC/Emissions

FCC part 15B and R&TTE equivalent

Safety/Low Voltage

EN60950-1

Environmental

IEC 60529, IP55 (Optional)

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S14GT Data Sheet
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04/17/2020

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6

Product Code Decoder

S 1 4 GT - AXX - N F
Splitter
S14GT = 1x4 Wireless Splitter

Gain
A00
A10

Note:Connector
NF
TF
SF= N Female= TNC Female= SMA Female= 00dB (Standard)= 10dB (Option)

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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S14GT Data Sheet
059-FSA-ALQ-AAS-AGZ-003
04/17/2020

7Mechanical Drawing
S14GT — L Band Signal Splitter

11/24/15 Rev. 001
GPS Source Part No.

FinishS14GT
Description

S14GT W/DC BIAS SELECT

SizeC

N/Ard

Material

Mass

3 Angle Projection

N/ATolerances
Linear.X.XX

Angular= ±0.100= ±0.010±1°RADIISee Linear

All materials and finishes shall comply with European Union RoHS and are lead free. Dimensions are in inches unless otherwise specified.

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S14GT Data Sheet
059-FSA-ALQ-AAS-AGZ-003
04/17/2020

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S14GT Data Sheet
059-FSA-ALQ-AAS-AGZ-003
04/17/2020

S14GT Data Sheet
059-FSA-ALQ-AAS-AGZ-003
Page 11 of 11, 04/17/2020

2121 Executive Cir., Ste 100
Colorado Springs, CO 80905
Phone: (+1)(719) 421.7300
Toll Free: (+1)(866) 289.4777
GPSS-Sales@gd-ms.com
www.gpssource.com
AS9100 and ISO 9001 Compliant CompanyX X© 2017 GPS Source, Inc. All rights reserved.

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