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Microwave Frequency Engineering & Coordination
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Comsearch engineers perform all necessary steps to design, engineer and coordinate a fully operational, interference-free microwave system, including:

• Path Design
• Interference Analysis
• Coordination and Case Resolution
• FCC Application Preparation and Filing
• Prior Coordination Renewal

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Path Design

Comsearch will evaluate your path and provide expert solutions to achieve maximum system performance. Our services include:

• Line-of-Sight (LOS)/Centerline Optimization Analysis
  We conduct a Line-of-Sight analysis using USGS 7.5-minute maps or digitized terrain to evaluate path clearance based upon user- or industry-defined criteria.
  
  The centerline optimization calculation is an extension of the LOS analysis. It provides the recommended antenna centerline height for one or both sites needed to ensure LOS clearance.
  


• Reliability Study
  Comsearch performs a detailed analysis to determine the annual outage time on a path due to atmospheric multipath propagation and rain attenuation. The technical details considered in the analysis include radio and antenna performance, climatic factors, and the interference environment.
  


• Reflection Point and Anti-Correlation Analysis
  This analysis determines the optimum centerline heights to eliminate simultaneous reflective fading of the main and diversity signals over a typical range of earth radio (K) factors.
  
  

Interference Analysis

Comsearch is the industry expert on microwave RF interference prediction. No other firm offers the combination of frequency engineering experience and expertise, industry leadership, quality software, and comprehensive databases that Comsearch does. Our interference analysis services include:

• Evaluation of Existing Frequency Plans
  We identify collocated or nearby transmitters already licensed in your frequency band in order to match the high/low frequency plan and reduce the possibility of encountering reflective interference from a nearby system.
  
  
• Computer Modeling
  Comsearch's proprietary interference analysis software considers such factors as antenna height, antenna performance, receiver filter performance, modulation, terrain, path orientation, and receiver threshold.
  
  
• Frequency Selection
  We conduct an evaluation against co-channel, adjacent channel and adjacent band systems using industry-accepted procedures and TIA Bulletin 10 criteria for interference resolution.
  
  
• Intermodulation Analysis
  We analyze your transmit frequencies to identify intermodulation products or harmonics that may potentially affect your receive frequencies.
  
  
• Engineering Documentation
  We supply system parameters including frequencies at the completion of the frequency selection process, along with other pertinent information.
  
  

Coordination and Case Resolution

All microwave bands subject to FCC Rule Part 101 require coordination. For two decades, Comsearch has played a leading role in the National Spectrum Managers Association (NSMA), the industry body recognized in the development and refinement of prior coordination procedures.

• Notification
  Comsearch circulates the technical parameters of your proposed system to all existing and proposed licensees in your area and frequency band of operation, as required in the prior coordination process. By FCC Rule, recipients are given 30 days to respond.
  
  
• Case Resolution
  Comsearch receives and responds to any objections to your proposed system and acts as your technical liaison until all cases are resolved.
  
  
• FCC Documentation
  Upon successful completion of the prior coordination process, Comsearch prepares documentation required to satisfy FCC Rule Part 101.103 (d). This exhibit is required upon submittal of your license application.
  
  

FCC Application Preparation and Filing

Comsearch can prepare and file your FCC license applications. Learn more about our FCC Application Filing Services

Prior Coordination Renewal

FCC rules state that a system must be applied-for or licensed within six months of the issuance of the Prior Coordination Notice. If a system has not been applied-for or licensed during this time frame, the "lifetime" of the coordination period can be extended an additional six months via a renewal notification of the system.

Comsearch tracks your PCN and notifies you when a renewal is required. Should you elect to maintain the system, Comsearch issues a prior coordination notice to "renew" your system for an additional six months.

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