GPS over Fiber - Reference Timing Fiber Optic Waterproof Solution

F-GPS-TX-WE / F-GPS-TX-RM
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Description Features Drawings Model Selection Specification Q&A Documents Support
Description

Part Number F-GPS-TX-WE  /  F-GPS-TX-RM 

 The Thor Fiber GPS over Fiber outdoor weather kit allows you to send a GPS signal over long distance for synchronizing cellular base stations.
Allows transmission of the two main signals in the GPS band, L1 and L2, at 1575.42 MHz and 1227.6 MHz. 
By using built-in LNA , this GPS over Fiber Link is designed to offer a very low noise figure
Sending GPS over the coax is very dificult to do over long distances so our GPS system has many diferent advantages:
Units have LCD dispalys to display RF and Optical levels that is built into our units
The transmitter shows incoming RF level and optical output power. The receiver has built in Optical power meter and RF ouput level meter,  allows simple troubleshooting.
Thransmitter is waterproof and Receiver is rackmountable in 1RU chassis.
The Transmitter has Bios-T and can power Active GPS antena.
Both transmitter and receiver have dual redundant power supplies, making them very robust and pragmatic for commerical architectures.

These systems are very easy to deploy and can offer various configurations very many applications.
Main receiver is 19' rack mountable but tranmitter has a built in compact enclosure which is deployable in any environment.
Units are used as a point to point transmission from the tramsitter to the receiver, but the transmitter can be accompanied with our optical splitters which can be used for point to multipoint applications (star configuration)  1x2, 1x4, 1x8 ,1x16 and 1x32
It's also possible to add additional splitters on the receiver side and have up to 6 GPS ouputs on the receiver (special order).
You can add 1x2 optical splitters to the receiver and use them as in line from one receiver to the next in a cascading configuration for easy distribution.

 

 

Features
  • Supports both GPS bands, L1 and L2, at 1575.42 MHz and 1227.6 MHz
  • Waterproof Transmitter - NEMA 4 Fiber Transmitter for outdoor weather enclosure
  • 19" rack mountable receiver
  • 50 ohm N type RF connector or TNC by request
  • +5V DC to the GPS antena
  • Dual power supplies
  • Optical meter built in
  • RF meter built in
  • RS232 communication and setup
  • SC/APC fiber connectors
  • Transmitter supports up to 32 Receivers
  • Transmits all common GPS, GALILEO and GLONASS bands
  • L1 and L2 GPS frequencies
  • Link operation 1m to 50km
  • >50km systems also available
  • GPS antenna powering and monitoring
  • DAS, WiMax, Satcom, LTE
  • Time server load input/spoofing
  • Simple plug and play
  • Fiber-Span replacement product
  • Thor Fiber standard 5 year warranty included

 

GPS-over-Fiber Applications:

  • Cell towers, 
  • Cellular Base Station Equipment 
  • Shelters
  • Aircraft
  • SATCOM
  • Vehicles
  • Naval
  • Bunkers
  • Subways
  • Undeground Parking Stuctures,
  • Tunnels
  • Submarines
  • Aerospace and Defense
  • Mines and Mining
  • Driling Ocean Towers
  • Underwater Stuctures

 

IMPORTANT NOTE*** (it is very important to interface our unit with SC/APC - Angle Polished Connector to avoid any light reflections.

If your fiber is terminated with the  SC, ST, FC /PC flat connector, you need to use an optical jumper from PC type to SC/APC for proper conversion. 

Drawings
Model Selection

Transmitter  -Weatherproof Enclosures NEMA 4 and dual power supply, LCD display, RF and Optical meters built in

F-GPS-TX-WE  -  GPS fiber optic Transmitter

Receiver  -19" rack mountable enclosure ,LCD display, RF and Optical meters and dual power supply

F-GPS-RX-RM  GPS fiber optic Receiver (one RF GPS output)

F-GPS-RX-RM-XX  (XX = 2-6)  GPS fiber optic Receiver (2 - 6 RF GPS outputs)

F-GPS-RX-RM-OU  GPS fiber optic Receiver with Optical Output for cascading

Specification

IMPORTANT NOTE*** (it is very important to interface our unit with SC/APC - Angle Polished Connector to avoid any light reflections.

If your fiber is terminated with the  SC, ST, FC /PC flat connector, you need to use an optical jumper from PC type to SC/APC for proper conversion. 

 

GPS FIBER TRANSMITTER

Item Unit Indexes Remark

Optical Characteristics

Laser Type

  DFB  
Optical Wavelenght nm 1310 or  (CWDM 1510,1530,1550,1570nm -Special order)

Specified by the user

Optical Output Power

mW 1 or ( 2,3,4,8 -Special order)

Specified by the user

Optical Return Loss

dB 50  

Optical Connector Type

  SC/APC

Specified by the user

RF Characteristics

Input Impedance

Ω 50  

RF Connector

  N type by default or TNC type by request

Specified by the user

Operating Bandwidth

MHz 85~2400  

Input Range

dBuV 47~67

Input level (AGC attenuation=0)

Flatness

dB ±2

50~600MHz

±2

600~2000MHz

Input Return Loss

dB 12

50~2400MHz

C/IM3

  ≥55

Note 1

AGC attenuation

dB -7~+7

Note 2

Frequency Response (85–2400MHz) dB +/-1.2  
Input Noise Floor @1Ghz

dBm?Hz

-149  _ - 153 EIN
Input Third Order Intercept @1Ghz dBm 12 IIp3
RF Link Gain dB 20  
Spur Free Dynamic Range (dB/Hz)2/3 109 SFDR
Isolation dB 50 - 60  

General Characteristics

Serial Interface

  RS232  

Power Supply (AC)

V 100~240

Optional dual power

Consumption

W 10  

Relative Humidity

% 5~95  

Working Temperature

°C -20~60  

Storage Temperature

°C -40~70  

Dimension (W)*(D)*(H)

mm 1U 19 inch
483*395*44
 

Note 1: C/IM3 is defined as the ratio between the peak of carrier signal and triple beat (IM3) by using a two-tone test (1.0GHz and 1.1GHz).
Note 2: The test condition adopts the specified optical transmitter, AGC attenuation= 0 and optical receiving power= -5dBm.

GPS FIBER RECEIVER

Item Unit Indexes Remark

Optical Characteristics

 

     

Optical Wavelength

nm 1260-1620

 

Responsivity

A/W

≥0.9

 

Optical Return Loss

Optical Receiving Power

dB

dB

≥ 50

-12 ~0

 

Optical Connector Type

  SC/APC 

 

RF Characteristics

Input Impedance

Ω 50  

RF Connector

  TNC type N type

Specified by the user

Operating Bandwidth

MHz 85~2400  

Output Impedance

Ω 50  

Flatness

dB ±2

50~600MHz

dB

±1.5

600~2000MHz

Input Return Loss

dB 12

50~2400MHz

C/IM3

  ≥55

Note 1

AGC attenuation

dB -7~+7

Note 2

Frequency Response (85–2400MHz) dB +/-1.2  
Input Noise Floor @1Ghz

dBm?Hz

-149  _ - 153 EIN
Input Third Order Intercept @1Ghz dBm 12 IIp3
RF Link Gain dB 20  
Spur Free Dynamic Range (dB/Hz)2/3 109 SFDR
Isolation dB 50 - 60  

General Characteristics

Serial Interface

  RS232  

Power Supply (AC)

V 100~240

Optional dual power

Consumption

W 10  

Relative Humidity

% 5~95  

Working Temperature

°C -20~60  

Storage Temperature

°C -40~70  

Dimension (W)*(D)*(H)

mm 1U 19 inch

483*395*44

Note 1: C/IM3 is defined as the ratio between the peak of carrier signal and triple beat (IM3) by using a two-tone test (1.0GHz and 1.1GHz).
Note 2: The input level range is 47~67dBµV when AGC attenuation=0; the input level range is 48~68dBµV when AGC attenuation=1. That is to say, AGC attenuation increase 1dB, the input level will corresponding increase 1dB and the optical receiver output level will also increase 1dB (the same optical power received). The reduce rule is just the same.

 

Question and Answers
Answer:

Our GPS over fiber optic transmitter and receiver  F-1GPS-TX/RX  or Lband F-LBAND-TX/RX support frequencies ranging from 54-2600 MHz. It is protocol-independent, so it does not measure the modulation in use but rather the band spectrum.

After conducting some research, I found that the MUOS system uses a narrowband waveform operating at a frequency of 300-320 MHz and a wideband waveform operating at a frequency of 1200-1300 MHz.

 The narrowband waveform offers voice and low data rate communications, while the wideband waveform offers high data rate communications for video and large file transfers. Therefore, our GPS over fiber optic transmitter and receiver should work with the MUOS system.

F-1GPS-TX/RX

Another thing that needs to be checked is the RF power. Our RF transmitter requires an input of 10-25 dBmV, with the same corresponding output on the receiver.

Since the MUOS system is bi-directional, you would need to use two sets of the  TX/RX's and use them in reverse over 2 fibers. Most likely, you would need to use a circulator or duplexer between TX and RX to avoid signal loop.

In summary, the devices should work if the RF frequency and RF power are in the range.

The MUOS waveform is a satellite communications waveform developed for use by the United States Department of Defense's (DoD) Mobile User Objective System (MUOS). The MUOS waveform provides advanced voice, data, and video communications capabilities to mobile and tactical users worldwide. It is designed to provide enhanced communication capabilities to military users in remote or difficult-to-reach locations, such as ships, aircraft, and land-based vehicles. The waveform is designed to operate in multiple frequency bands and offer features such as anti-jamming, low probability of detection, and enhanced security.

The MUOS (Mobile User Objective System) waveform operates in the Ultra High Frequency (UHF) band, specifically in the range of 300 MHz to 3 GHz. The MUOS system uses five geostationary satellites to provide global coverage.

The MUOS system has a narrowband waveform that operates at a frequency of 300-320 MHz and a wideband waveform that operates at a frequency of 1200-1300 MHz. The narrowband waveform offers voice and low data rate communications, while the wideband waveform offers high data rate communications for video and large file transfers.

The MUOS system uses a frequency division multiple access (FDMA) technique, which allows multiple users to share the same frequency band by dividing the band into smaller sub-channels. This helps to increase the efficiency of the system and reduce interference between users.

It is bi-directional, meaning that it supports two-way communication. This allows users to not only receive information but also to transmit information back to the network. The bi-directional capability is essential for military operations as it enables troops to communicate and exchange information in real-time, which is critical for mission success.

The MUOS (Mobile User Objective System) waveform uses a 50-ohm impedance antenna. This is the standard impedance used for most UHF communications systems, including military and commercial systems. A 50-ohm impedance is commonly used because it provides an optimal match between the antenna and the transmitter or receiver, minimizing signal reflections and maximizing signal efficiency. The use of a 50-ohm impedance antenna helps to ensure that the MUOS system can operate efficiently and effectively, providing reliable communications for military users in remote or difficult-to-reach locations.

 

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