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S14WI Splitter for WirelessInfrastructure
Technical Product DataFeatures• Active or Passive Options Available• Optional Antenna Current Monitorand Alarm• Optional Antenna DC Bias Select• Pole-mount Environmental Housing
Available (IEC 529 level IP55)• Surge Protection Available(Tested to EN61000-4-5)

Description
Eliminate the cost of multiple antennas and long cable runs in your wireless base stations!
Designed to meet the demanding, high reliability requirements of the wireless infrastructure
market, the GPS Source S14WI is a high performance GPS signal splitter. The device can beconfigured to monitor the GPS antenna current, providing an alarm indication if the antenna is
not operating according to spec. The S14WI also features an optional antenna DC bias “Pick-&Choose” circuit which allows for the active antenna DC input to be applied to any or all of the RFoutputs. With this option, one DC voltage will be chosen to power the antenna while the otherinputs will be switched to DC loads. If the selected DC bias input should fail, the DC bias will beautomatically switched to another DC input so as to ensure an uninterrupted supply to the activeantenna. The S14WI may be configured as a passive or an active device, giving the network
engineer the flexibility to specify the device gain and port-to-port isolation. The S14WI may also
be ordered with surge protection on all five ports and in a sealed housing sufficient for many
years of operation in external environments
The GPS Source S14WI can be custom designed to fit your unique infrastructure requirements.
Please call, fax, email (sales@gpssource.com), or visit our website (www.gpssource.com) forfurther information on product options & specifications.

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10/16/2006

Document number: 126(719) 561-9520

Rev. 004

2 of 9oElectrical Specifications, Operating Temperature -40 to 85 C
Parameter

Conditions

Freq. Range
Gain(2)-Amplified (Norm)-Amplified (Hi Iso.)
Loss-Passive
Input/Output SWR
Noise FigureAmplified
Amp. Balance
Phase Balance
Delay-Passive-Amplified
Isolation-Amp/Pass (Norm)-Amplified (Hi Iso.)
DC IN
DC Ripple
Device Current
Ant/Thru Current(3)AntennaIOC
Monitor (4)ISC
Surge ProtectionNotes:Min(1)

Ant – Any Port, Unused Ports - 50 Ω
Ant – Any Port, Unused Ports - 50 Ω(1)(Gain may be specified by the customer)
Ant – Any Port, Unused Ports - 50 Ω(1)All Ports 50Ω(1)Ant – Any Port, Unused Ports - 50 Ω(1),Gain = 20dB
|J1 - J2|, Ant–Any Port, Unused Ports - 50 Ω(1)Phase (J1 - J2), Ant – Any Port, Unused Ports- 50 Ω(1)Ant – Any Port, Unused Ports - 50 Ω(1), L1

Adjacent Ports: Ant - 50Ω(1)Alternate Ports: Ant - 50Ω(1)Adjacent Ports: Ant - 50Ω(1)Alternate Ports: Ant – 50Ω(1)DC Input on any RF Output
300 Hz to 1MHz
Current Consumption of Active device, excludes
Ant. Cur.

Max source DC current through device
Range for Open Circuit Threshold
Range for Short Circuit Threshold(5)

1.2
20
97

21
10
9.0
1.3:1

15
21
35
44
4
18

15
100

Max

Units

1.7

GHz

24
119.5
2.0:1
2.0

dB

0.5

dB

1.0deg

35

nsdB
dB

dB
dB
dB
dB
VDC

1250mVpk-pk

20mA

250
75180mA

48/20usmA
KA(1). Note that for proper RF performance, the S14WI must have all RF ports terminatedinto a 50Ohm coaxial cable system or a 50Ohm load.
(2). Custom gain option available.
(3). Maximum current available from the DC source through the S14WI when outputof S14WI is short circuited.
(4). Open circuit and Short Circuit Current (IOC, ISC) may be specified by the customer
within the specified range.
(5). In-rush current shall not exceed 3A or exceed Isc for greater than 1ms

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10/16/2006

TypDocument number: 126(719) 561-9520

Rev. 0043 of 9

Freq. Response (Active)

1975
1971

1829
1833

1926

1780
1786

1925

1731
1740

1878

1683
1694

1879

1634
1648

1585

1488

1439

1390

1341

21.77

1293

1244

1195

1146

1098

1049

23.67

1536

60
50
40
30
20
100-10-20-30-40
1000

dB

Performance Data

Input SWR (Active)

1601

1509

1463

1416

1370

1324

1.28
1278

1231

1185

1139

1093

1046

1.73

1555

10
98
7
6
5
4
3
2
11000

SWR

Freq. (MHz)Freq. (MHz)Figure 1. S14WI Active Performance

GPS Source, Inc. reserves the right to change or modify
product performance and specifications without prior notification.

Your source for quality GNSS Networking
Solutions and Design Services, Now!

10/16/2006

Document number: 126(719) 561-9520

Rev. 004

Freq. Response (Passive)

1971
1971

1833
1833

1925

1786
1786

1925

1740
1740

1879

1694
1694

1879

1648
1648

1601

1509

1463

1416

1370

1324

-9.09

1278

1231

1185

1139

1093

1046

-7.81

1555

60
50
40
30
20
100-10-20-30
-40
1000

SWR

4 of 9Input SWR (Passive)

1509

1463

1416

1370

1324

1278

1231

1185

1139

1093

1046

1601

1.50

1.31

1555

10
98
76
543211000

SWR

Freq. (MHz)Freq. (MHz)Figure 2. S14WI Passive PerformanceGPS Source, Inc. reserves the right to change or modify
product performance and specifications without prior notification.

Your source for quality GNSS Networking
Solutions and Design Services, Now!

10/16/2006

Document number: 126(719) 561-9520

Rev. 004

Adjacent Port Isolation (Active or Passive)

1925

1971
1971

1833
1833

1925

1786
1786

1879

1740
1740

1879

1694
1694

1648

1509

1463

1416

1370

1324

1278

1231

1185

1139

1093

1046

1601

-19.55-19.93

1555

60
50
40
30
20
100-10-20-30
-40
1000

SWR

5 of 9Output SWR (Active or Passive)

1648

1509

1463

1416

1370

1324

1278

1231

1185

1139

1093

10461601

1.68

1.201555

109876543211000

SWR

Freq. (MHz)Freq. (MHz)Figure 3. S14WI Active or Passive Output Port Performance
GPS Source, Inc. reserves the right to change or modify
product performance and specifications without prior notification.

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Solutions and Design Services, Now!

10/16/2006

Document number: 126(719) 561-9520

Rev. 004

6 of 9Operational Description
Antenna DC Bias Select
The S14WI splitter requires that a DC voltage be applied to one or more of the RF output ports
by way of the RF connector center conductor. If DC voltages are applied to more than one of
the RF output ports, the S14WI pick-&-chose circuit will choose one of these DC inputs to power
the active circuitry of the S14WI and will also pass this DC voltage through the splitter to thecenter conductor of the RF input port. The DC voltage available on the RF input port can thenbe used to power the application’s active antenna. The DC voltages applied to the RF outputs
that are not chosen by the pick-&-choose circuitry will be automatically switched through an RF
choke to 200Ohm DC loads. The DC voltages may be applied to any or all of the RF outputs;
however, the pick-&-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 thechosen DC input were to be removed or fail, the pick-&-choose circuit will automatically switch
to the next higher numbered RF port to which a DC voltage is applied.
The S14WI requires that only one RF output port have an external DC voltage applied (i.e. thedevice will operate properly even if any one, two, or three ports do not have a DC voltage
applied or if a DC voltage is removed from one of the ports). Ports that do not have an external
DC voltage applied or from which an external DC voltage is removed are internally pulled down
so as to ensure that false input voltage indications do not occur.
Example: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 & 4 will beswitched to 200Ohm DC loads.
Now assume that the DC voltage on port 1 is removed. The S14WI will automatically terminate
the input internally with a pull down resistor and switch 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 remained switched to a 200 Ohm load.
Antenna Monitor and Alarm
The S14WI includes an option to monitor the status of the application’s active antenna and toprovide an alarm indication if the antenna’s current is not within a specified range. The default
current window for the S14WI is 10mA to 150mA (e.g. below 10mA indicates an open circuit,
above 150mA indicates a short circuit); however, for large volume orders, the antenna current
window may be specified to meet the customer’s specific requirements.
The S14WI samples the antenna current 16 times per second. So long as the average of four
samples are within the current window, the S14WI will continue to operate normally, passing theYour source for quality GNSS Networking
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10/16/2006Document number: 126(719) 561-9520

Rev. 004

7 of 9DC 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 200Ohm DC loads. If the average of fourantenna current samples falls outside of the antenna monitor current window, the DC voltage tothe antenna is removed (open circuit) and all DC inputs are switch to Pass DC. However, since
the DC path to the antenna has been opened, the DC current on all four DC inputs will be at ornear zero (less than 0.5mA for the passive configuration and less than 5mA for the active). In
this alarm condition, all GPS receivers connected to the RF outputs will also see very low
antenna current draw, resulting in corresponding antenna alarm conditions within each receiver.
Once in the alarm condition, the S14WI will periodically (every 60 seconds) attempt to reconnect DC power to the antenna. If the antenna failure condition persists, the S14WI will reenter the fault condition, repeating this cycle until the fault condition is removed.
Amplifier and Splitter
The S14WI has the option to be ordered as either a passive device, or to be ordered withamplification. If the amplified option is chosen, additional options are available for specifying theamplifier gain and the port-to-port isolation (see Hi Iso. option in electrical specifications).
Amplified versions of the S14WI that also include the High Isolation option do not require
50Ohm termination on unused ports in order for the splitter to operate properly. Passive
versions or Amplified versions without the High Isolation option always require 50 Ohmterminations on unused ports for proper operation.

Certifications and Approvals
oooo

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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10/16/2006

Document number: 126(719) 561-9520

Rev. 004

8 of 9Part Number:

S14WI – A – PC – AM – SRP – SF
Product:
1x4 Splitter for Wireless(Std: Pass DC J1-Ant, J2,J3,J4 DC Blk.)
Gain Option:A – Amplified
Axx – Custom GainBlank – Passive
H – Hi Isolation
Pick & Choose Option:
PC – Add Pick & Choose
Blank – Std. Config.
Antenna Monitor Option:
AM – Add Ant. Monitor
Blank – Std. Config.
Surge Protection Option:
SRP – Surge Protection
Blank – Std. Config.

Connector Options:
NM – N, MaleNF – N, Female
SM – SMA, MaleSF – SMA, Female
TM – TNC, MaleTF – TNC, Female
BM – BNC, MaleBF – BNC, Female
SB – SMB Jack, Female
SC – SMC Jack, Female
MX – MCX Jack, Female
For help in creating the part number to meet your exact needs, contact us at
Sales@gpssource.com or visit our website at www.gpssource.com .

Your source for quality GNSS Networking
Solutions and Design Services, Now!

10/16/2006

Document number: 126(719) 561-9520

Rev. 004

9 of 9MechanicalYour source for quality GNSS Networking
Solutions and Design Services, Now!

10/16/2006

Document number: 126(719) 561-9520

Rev. 004