TECHNICAL PRODUCT DATA SHEETMS18 REGULAR HOUSING
Military Qualified 1x8 GPS Splitter

DESCRIPTION
MS18, a military qualified one-input; eight-output GPSsplitter. Typical application is input from an active GPS
roof antenna split evenly between eight receiving GPSend-units. The MS18 can be configured to pass DCfrom an RF output (J2) to the antenna input port (J1) topower an active GPS antenna on that port. The
remaining RF outputs (J3 thru J9) feature a 200 DC
load to simulate an antenna DC current draw for anyreceiver connected to that port. The MS18 can beconfigured with a MIL-STD-704 or MIL-STD-1275
compliant 28VDC power supply that will power theactive GPS antenna connected to J1.

FEATURES
Designed and Manufactured to MilitarySpecifications
 Passes GPS GNSS Signals
 Gain Flatness (Gain |L1 - L2 | < 3dB)
The MS18 is for military applications and environments
where high reliability is required. It has been designed
to the following MIL standards.
MIL Standards

OPTIONSMIL-STD-810

MIL-E-5400

MIL-STD-1472

MIL-HDBK-454



MIL-STD-202MIL-STD-1587



MIL-STD-883

MIL-STD-461F

MIL-STD-704

MIL-STD-1275E

Amplified and Custom Gain Options
Various Connector and Power Options

Please contact GPS Source via phone, email, or visit thewebsite for further information on product options andspecifications.

MS18 Regular Housing Data Sheet
059-FSA-ACA-EEY-AG-009
9/1/20www.gpssource.com

AS9100 and ISO 9001 Compliant Company

1.

MS18 Specifications

1.1

Electrical Specifications
Table 1-1.

Electrical Specifications

Operating temperature -40°C to 85°C
ParameterConditions

Min

Frequency Range

Ant: Any Port; Unused Ports: 50

1.1Standard Amplified

Ant: Any Port; Unused Ports: 50

141516Custom

As Specified (xdB, from 0 to 20dB)

X - 1.5

X

X + 1.5

GainAmplified

TypMaxUnits

1.7GHzdB

Input SWR

All Ports 50

2.0:1—Output SWR

All Ports 50

2.0:1

—

Ant: Any Port; Unused Ports: 50

3.8

dB

[L1 – L2] Ant: Any Port; Unused Ports: 50

3dB

Amp. Balance[J2 – J3] Ant: Any Port: Unused Ports: 50

0.5

dB

Phase Balance

Phase (J2 – J3) Ant: Any Port; Unused Ports: 50

1.0DegreeGroup Delay Flatness

Td,max - Td,min; J2 – J1 (Ant)1.0nS

Noise Figure

15dB Gain Amplified

Gain Flatness

Amplified

Adjacent Ports: Ant – 50

16Opposite Ports: Ant – 50

22Adjacent Ports: Ant – 50

27Opposite Ports: Ant – 50

31Input IP3

Ant: Any Port; Unused Ports 50
1MHz Tone Spacing-12dBmInput P1dB

Ant: Any Port; Unused Ports 50

-22dBmCurrent (internal)

Current Consumption of MS18 (excludes externalantenna)

Draw Current Pass DC

Normal15dB Gain

Amplified

Isolation
High7dB Gain

Max RF Input

Amplified

AmplifieddB5065mA

Non-Powered Configuration, DC Input on J2250mA

Max RF Input Without Damage

30dBm

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Table 1-2.

DC IN and OUT Specifications

Parameter

DC INCondition
DC BlockAny DC Blocked Port with a 200 LoadPass DC

Non-Powered Configuration, DC Input on J2, J3, J4, J5,J6, J7, J8, or J9

5PoweredMilitary Connector MIL-STD-704 & 1275 Normal andEmergency Conditions

9Military Connection; Antenna thru Current 60mA5

DC OUT(2) PoweredNotes:

1.

Max

Units

14728

VDC32(1)7VDCPower Connector Options
Figure 1-1.

Power Connector Options PMS-1275/XX and PMS-704/XX

PinDescription

A

Positive

B

Ground

Note:

1.1.2

TypThe 1275 spike and surge protection assumes a 28V system. 33.3V or greater will trigger over voltage protection
circuitry.
DC output voltage to the antenna port (J1) can be customized to 5V or 7V (5V default).

2.

1.1.1

Min1.
2.

Image is not to scale.
Included standard.

Power Connector Options
Figure 1-2.
Input

Power Connector Options PMS38999-1275/XX and PMS38999-704/XX
Description

APositive

BGroundCNo Connect

Note:

1.
2.

Image is not to scale.
Not included.

Page 3 of 12
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2.

Performance Data

2.1

MS18 — Active
Figure 2-1.

Active MS18 Splitter: Gain vs. Frequency

Gain vs Frequency
20(L1) 15.141dB(L2) 14.596dB
15

Gain (dB)

1050-5-10-151000

1100

1200

1300

1400

1500

1600

1700

1800

1900

2000

1700

1800

1900

2000

Frequency (MHz)Figure 2-2.

Active MS18 Splitter: SWR vs. Frequency

SWR vs Frequency
1098SWR76543(L2) 1.54 SWR

2110001100

12001300(L1) 1.24 SWR
1400

15001600

Frequency (MHz)Page 4 of 12
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3.

Environmental Requirements

3.1

Temperature and Altitude
The MS18 complies with the temperature-altitude tests per MIL-STD-810C, Method 504, Procedure 1 Equipment
Category 5.

3.2

Temperature ShockThe MS18 will withstand without degradation (while not operating) Method 503.1, Procedure 1 of MIL-STD-810C.

3.3

Explosive Atmosphere
The MS18-A is designed for operation in the presence of explosive mixtures of air and jet fuel without causing
explosion or fire at atmospheric pressures corresponding to altitudes from −1,800 feet to 50,000 feet The MS18
does not produce surface temperatures or heat in excess of 400°F. The MS18 does not produce electricaldischarges at an energy level sufficient to ignite the explosive mixture when the equipment is turned on or off oroperated. The MS18 is designed to meet the requirements of MIL-STD-810C, Method 511.1, and Procedure II.
Hermetically sealed equipment meeting the Requirements of MIL-STD-202, Method 112D, or MIL-STD-883,Method 1014.7 (as applicable), and not exceeding a Helium leakage rate of 1 x 10-7 cc/sec, are exempt from thisrequirement.

3.4

Decompression
The MS18-A is designed to meet the performance standards per RTCA-DO-160E PARA 4.6.2 cat D during andfollowing a rapid and complete loss of normal cabin compartment pressurization (10,000 ft.) from an airplane flight
altitude of 50,000 feet within 15 seconds. The MS18 will remain operating for 5 minutes at 50,000 feet before being
returned to normal cabin pressure.

3.5Overpressure
MS18-A is capable of withstanding, for 10 minutes, while not operating, a 12.1 psi compartment pressure with nophysical distortion or permanent set per RTCA-DO-160E PARA 4.6.3. The MS18 will operate satisfactorily upon
return to normal pressure.

3.6

Salt Fog
The MS18-A meets the requirements of Salt Fog conditions per Paragraph 3.2.24.9 of MIL-E-5400 and MIL-STD810C Method 509.1. The MS18 can withstand a salt concentration of 5 percent at a temperature of 35o C for 48
hours without degradation

3.7Fungus
The MS18-A meets the requirements of Fungus conditions per Paragraph 3.2.24.8 of MIL-E-5400 and MIL-STD810C Method 509.1 i.e. fungus inert materials per requirement 4 of MIL-HDBK-454.

3.8

Humidity
The MS18-A is capable of meeting the requirements of a ten-day humidity test conducted per MIL-STD-810C,
Method 507.1, Procedure I. MS18 can withstand exposure to 95% relative humidity at a temperature of 30o C for28 days.

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3.9

Sand and Dust
The MS18-A meet be capable of meeting the requirements of Sand and Dust conditions of method 510 of MILSTD-810C, for a temperature of 145°F for duration of 22 hours.

3.10

Flammability
The MS18-A is self-extinguishing or nonflammable and meets the Requirements of Paragraph 5.2.4 of MIL-STD1587 and requirement 3 of MIL-HDBK-454.

3.11

Finish and Colors
All case surfaces of the MS18-A is treated with chemical film per MIL-DTL-5441, TYPE II, CLASS 3. The MS18-A
bottom contact surface is free of paint, or non-conductive finishes. The MS18 bottom contact surfaces areprotected from corrosion by a conductive coating (MIL-DTL-5541).All other surfaces, except connector mating
surfaces are primed per MIL-PRF-23377, TYPE 1 CLASS C and painted per MIL-PRF-85285, TYPE 1 COLORNUMBER ( 26231), military gray (not lusterless variety) per FED-STD-595 (exceptions are bottom and connector
surfaces are free of paint).

3.12

Human FactorsHuman Engineering principles and criteria (including considerations for human capabilities and limitations) using
MIL-STD-1472 in all phases of design, development, testing, and procedures development. The design is free ofall sharp edges, according to MIL-STD-1472.

3.13

Electromagnetic Interference and Compatibility Test
MS18 perform its intended function, and its operation does not degrade the performance of other equipment orsubsystems. The MS18 is designed to meet the following requirements of MIL-STD-461F:
Table 3-1.

Compatibility Test

Test

Description

CE102

Conducted Emissions Power Leads

10kHz to 10MHzCE106Conducted Emissions Antenna Terminal

10kHz to 40GHz

CS101

Conducted Susceptibility Power Leads

30Hz to 150kHz

CS103

Conducted Susceptibility Antenna PortIntermodulation, 15kHz to10GHz

CS105

Conducted Susceptibility Antenna Port

Cross-Modulation, 30Hz to 20GHz

CS114

Conducted Susceptibility Bulk Cable Injection

10kHz to 200MHz

RE102

Radiated Emissions Electric Field

10kHz to 18GHz

RS103

Radiated Susceptibility Electric Field

2MHz to 18GHz

Indirect Lightning(1)

Note:

1.

Damped Sinusoidal transients,

RF Leads,10kHz to 100MHz
Power Leads,10kHz to 100MHz

For additional detail regarding Indirect Lightning, please contact GPS Source.

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3.14

Shock
The MS18 is designed to withstand the shock levels specified in the saw tooth shock pulse parameter specified in
Figure 3-1 and Table 3-2. It is designed to meet the requirements of MIL-STD-810C Method 516.2 Proc. III.
Figure 3-1.

Peak Shock Levels

1.15P
Ideal Sawtooth Pulse
Tolerance Limits
0.07D

0.15P

P

0.05P
ReferenceLine

0.2P
0.15P
0.05P
0.3D

Table 3-2.

D0.3P

Peak Shock Levels
Flight Vehicle Equipment
Test

Minimum Peak Value (P) g’s

Nominal Duration (D) ms

Functional

2011

Crash Safety

4011

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Vibration
The MS18 is designed to meet the requirements of random vibration per conditions (MIL-STD-810C, Method514.2, Procedure 1A) to the levels defined below. Acceleration Power Spectral Density (PSD) for the random
vibration envelope is shown in Figure 3-2. Amplitudes for the functional levels and endurance level requirements
are as shown in Table 3-3.
Figure 3-2.

Zone 3 and 4 Broadband Random Vibration

Zone 3 and 4 Broadband Random Vibration
1.0Acceleration Spectrum, g2/Hz

3.150.10.01

Vib Zone 3 and 4 Endurance, 16.0g RMS,
Duration = 2.5 Hours/Axis
Vib Zone 3 and 4 Functional, 12.6g RMS,
Duration = 2.0 Hours/Axis

0.001
10100

1000

Frequency, Hz

Table 3-3.

Vibration Zone 3 and 4Vibration Zone 3 and 4
Functional, 12.6g RMS
Duration = 2 Hours/Axis

Freq. Hzg2/Hz150.033

80

0.177

2000.177

2340.111500

0.111

5350.097

10000.097

20000.024

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4.

Product Options
Table 4-1.

MS18 Available Options

Power Supply
Source Voltage

Voltage Input

TypeDC 12-32VDC

Military Style Connector
DC Voltage Out

Output Voltage (1)57.5
9RF Connector
Connector TypeConnector

PortN(Female/Male)

SMA(Female/Male)

TNC(Female/Male)

Limitations(1)

Pass DC (2)

DC is passed J2 to ANT(J1), J3, J4, J5, J6, J7, J8, and J9 are DC Blocked with 200 Load

DC Blocked (3)All output ports DC blocked J2 - J9 with 200 Load

Note:

1.
2.
3.

Source Voltage Option: Any RF ports (input or output) can be DC Blocked or can pass through the powered DCvoltage.
J10 is not mounted with inline voltage.
When J10 (external power) is mounted all outputs are DC blocked standard.

Page 9 of 12
MS18 Regular Housing Data Sheet
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5.

Product Code Decoder
M S 1 8 - A - P M S - 1 2 7 5 / 5 - S F
MilitaryConnector Option
NFSFTFNMSMTM

M = Military QualifiedSplitter
S18 = 1x8 Splitter

Gain Option
A = Amplified (standard)
AS = Amplified Custom Gain by Port
AXX = Custom Gain (XXdB)

====
==

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

Antenna Output Voltage
5 = 5V
7.5 = 7.5V
9 = 9VBDC = Blocked DC

Source Voltage
PMS-1275
PMS-704
PMS38999-1275
PMS38999-704
Blank=====Military Connector and 1275B Compliant (User supplies DC, PM mating connector include standard)
Military Connector and 704F Compliant (User supplies DC, PM mating connector included standard)
Military 38999 Connector and 1275B Compliant (User supplies DC, PM mating connector NOT included)
Military 38999 Connector and 704F Compliant (User supplies DC, PM mating connector NOT included)
Pass DC J2-Ant (J1), Block DC-J3 thru J9Notes:- Use -AXX if all ports are same gain or -AS and prvide gain on each port in description field- Standard amplification is 15dB
- Custom gain range is 0-20dB- $50 each tethered load, call for help configuring correct port allocation

Notes:

1.

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.

Page 10 of 12
MS18 Regular Housing Data Sheet
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6.

Mechanical Drawing
MS18 Regular Housing — FSA-ACA-EEY-AGPb
RoHS.X = ± .1.XX = ± .01.XXX = ± .005

GPS SOURCE PART NUMBER

±1

DRAWN

DATE

CHECKEDDATE

COMPANY NAME

QA

DATE

DESCRIPTION

MATERIAL

MFG

DATE

SIZE

FINISHAPPROVEDDATE

SEE LINEARREVGPSS FILE NAME.

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MS18 Regular Housing Data Sheet
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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 anykind. 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.
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