Questions and Answers Yokota Air Base - Radio Frequency over Fiber.pdf
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- Attached to
- Yokota Air Base - Radio Frequency over Fiber
- Solicitation number
- FA520925Q042A
About this file
This document is a Questions and Answers file for the Yokota Air Base Radio Frequency over Fiber (RFoF) System, providing technical details about the communication infrastructure. The system will utilize AN/PRC-117G, AN/PRC-160, and KOR-24A radios supporting VHF/UHF Line-of-Sight, HF, and L-Band operations, with an anticipated upgrade to AN/PRC-167. The RFoF design involves a single-mode fiber core approximately 5 kilometers long, with optical aggregation using CWDM or WDM technology to multiplex multiple radio channels. The system is designed to handle a maximum RF output power of 20W, with RFoF transmitters driven by input levels of +10 to +13 dBm, and maximum RF input power to fiber equipment around 25 dBmV for both downlink and uplink, with provisions for power management through external attenuators or amplifiers.
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Other files
| File | Type | Posted |
|---|---|---|
| RFoF Link System - Statement of Work_16July25.pdf | ||
| Concept Picture RFOF_V2.jpg | JPG image | |
| Solicitation - FA520925Q042A.pdf | ||
| Provisions and Clauses.pdf |
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Yokota Air Base – Radio Frequency over Fiber (RFoF) System: Key Questions & Answers
This document outlines key aspects of the Radio Frequency over Fiber (RFoF) system at Yokota Air Base.
1. Radios
• Q: What radio models are being used or planned for this system?
o A: The system utilizes AN/PRC-117G, AN/PRC-160, and KOR-24A radios, supporting VHF/UHF LOS, HF, and L-Band (Link 16) operations. An upgrade from the AN/PRC-117G to the AN/PRC-167 is anticipated.
• Q: How will co-site interference be managed?
o A: Co-site interference will be mitigated through proper antenna separation and careful management of system gain and isolation via the RFoF design and rack layout.
• Q: What type of cable connects the radio and antenna ends?
o A: A single bidirectional coaxial cable is used for both the radio and antenna connections.
2. Fiber & Optical Aggregation
• Q: What does "Optical Aggregation" mean in this context?
o A: "Optical Aggregation" refers to using CWDM or WDM technology, where each radio channel operates on a different wavelength. This allows multiple channels to be multiplexed and transmitted over a single fiber core. Each bidirectional path consists of two unidirectional wavelengths (TX/RX), with splitting handled internally by the RFoF system.
• Q: How many fiber links are used between the radio and antenna stations?
o A: The design intends to use one single-mode fiber core between the antenna station (rooftop) and the radio room. However, two fiber pairs are available for flexibility, redundancy, or directional separation if needed.
• Q: What is the approximate length of the fiber link?
o A: The total fiber link length is approximately 5 kilometers, including three patch panels along the path.
3. Power Handling
• Q: What is the assumed maximum RF output power from the radios?
o A: A maximum RF output power of 20W is assumed, particularly for high-power Line-of-Sight (LOS) transmissions.
• Q: What RF input power levels are required for the RFoF transmitters?
o A: After attenuation, RFoF transmitters are anticipated to be driven with input levels of approximately +10 to +13 dBm. The RFoF system must accommodate this range or include internal attenuation for higher radio power levels.
• Q: How does the RFoF system handle power, and what are the maximum input power levels?
o A: The fiber itself does not carry power; the RFoF system is responsible for managing all RF power levels internally. The maximum RF input power to the fiber equipment is approximately 25 dBmV for both downlink and uplink, with adjustability via external attenuators or amplifiers as needed.
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