Part 101 covers fixed microwave communication systems used for point-to-point and point-to-multipoint links. It covers antenna performance (§101.115) and emission limitations (§101.111).

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Part 101 provides the technical framework for deploying Fixed Microwave Services, facilitating reliable point-to-point and point-to-multipoint wireless communication links. The regulations cover various aspects of system design, implementation, and maintenance across several frequency bands up to 90 GHz. Key technical considerations include:

1. Frequency Bands and Applications:
   The rules specify multiple frequency bands available for fixed microwave services, including the commonly used 6 GHz, 11 GHz, 18 GHz, and 23 GHz bands. Each band has unique characteristics suitable for different applications, such as mobile network backhaul, private point-to-point data links, and broadband distribution (47 CFR § 101.101). Frequency coordination is essential to avoid harmful interference, especially in shared bands with satellite or federal systems (47 CFR § 101.147).

2. Power Limits and Antenna Standards:
   Technical standards under 47 CFR § 101.113 dictate the maximum transmitter power output based on the frequency band, typically ranging from a few watts in higher bands to hundreds of watts in lower bands. Antenna standards under 47 CFR § 101.115 ensure that systems meet minimum performance requirements, such as directional gain and beamwidth, to focus energy and reduce interference. Find Antennas. 

3. Frequency Coordination and Interference Protection:
   As stipulated in 47 CFR § 101.103, frequency coordination is mandatory before deployment to identify potential interference with existing microwave systems. Engineers must use predictive modeling tools to assess potential conflicts, notify existing users, and obtain concurrence. The coordination process ensures that spectrum resources are efficiently utilized, allowing multiple systems to operate in the same area without interference.

4. Emission Limitations and Signal Quality:
   The regulations mandate stringent emission limits under 47 CFR § 101.111 to prevent out-of-band emissions from causing interference to adjacent frequency bands. These requirements specify the maximum allowable signal power levels outside the assigned channel and include guidelines for maintaining frequency stability and signal integrity.

5. Antenna Structure Compliance (Part 17):
   Antennas used for microwave links that exceed specific height thresholds or are near airports must comply with Part 17, which involves registering the structure with the FCC to avoid conflicts with aviation (47 CFR § 17.4). Proper lighting and painting may be required to ensure visibility and safety. Learn More. 

6. Specialized Systems and Advanced Configurations:
   Specialized microwave systems such as MAS and LMDS enable unique configurations for one-to-many communication (industrial control) or high-bandwidth broadband delivery over millimeter-wave frequencies. Deploying these systems requires compliance with distinct technical standards specified in 47 CFR § 101.1301 and § 101.1001.

We provide Fixed Microwave Services engineering, wireless backhaul design, and advice on FCC microwave power limits, antenna structure compliance, microwave frequency coordination, broadband network deployment, and more.