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Field Services
Where Theory Meets Reality—Determining the Real Environment

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Field Services

Conducting comprehensive on-site services for a full range of RFI, EMI, EMC, Radiation Hazard, site audits and path surveys for all modes of wireless telecommunications.

When field-related activities are needed, call on the experts. Comsearch Field Services engineers provide a full-range of on-site telecommunication related services including:

  • receive signal level (RSL) measurements in any frequency range,
  • site and system audits to document existing infrastructure,
  • microwave path surveys and signal blockage surveys,
  • radiation hazard measurements,
  • troubleshooting services to determine the source and cause of harmful radio frequency interference.
Comsearch field engineers have years of experience and a breadth of practical, hands-on knowledge of the evaluation of interference and signal propagation for wireless networks. With this experience and knowledge, we are able to rapidly assess any environment and determine the causes of harmful interference. We use state-of-the-art measurement equipment backed with Comsearch's unparalleled proprietary databases and analysis software. This uniquely positions us to accurately perform any wireless field-related activity. Our engineers are able to deploy globally within short notice and have all of the resources to conduct the full range of radio frequency interference (RFI), electromagnetic interference (EMI), electromagnetic compatibility (EMC), and Radiation Hazard (Radhaz) measurements.

While the specific services involved in Field Engineering activities are by nature unique to each individual job, the general process for all projects can be described in these 10 steps:

  1. Gather sufficient data to develop an understanding of the specific requirements, ie, RSL measurements, troubleshooting, path/system surveys, Radhaz, etc.
  2. Perform a database analysis to determine if the cause of the interference can be predicted theoretically.
  3. Assemble all required measurement equipment appropriate for the specific task; including spectrum analyzers, test antennas, low noise amplifiers (LNAs), power meter, signal generator, cables, antenna support structure, lifts as required for high centerline measurements and survey equipment.
  4. Travel to the measurement location with all required test equipment.
  5. Meet with the customer to review the issues, obtain additional first-hand knowledge of the problems, and perform initial measurements to quantify the interfering signal.
  6. Initiate the measurements and site/path surveys to gather all relevant data including internal and external spectrum traces, site and system photographs. Document all system anomalies such as broken connectors, damaged antenna and feeders, grounding issues, in-band and out-of band spectrum occupancy, broadband noise generators, etc.
  7. For troubleshooting measurements, capture spectrum traces of the interfering signal(s) and use triangulation methods to pinpoint the interference source.
  8. While on-site in the field, consult with Comsearch engineering office staff, as needed, to discuss the measurement activities, explore likely scenarios and enhance the measurement activity with appropriate database searches and theoretical analysis.
  9. For troubleshooting measurements, identify the source(s) of the interference and make recommendations to mitigate the harmful interference. For RSL, Radhaz, site/system audits and surveys, verify full data has been obtained for subsequent report and documentation purposes.
  10. Deliver comprehensive measurement report including methodology, calibration, all gathered data, results, summary and recommendations.

  • Comsearch's field engineers have an average of over 25 years of experience, countless real-life hands-on knowledge and an unsurpassed comprehension of RF signaling.
  • We provide cost effective solutions to resolve interference issues.
  • We use state-of-the-art measurement equipment and techniques.
  • We can rapidly deploy worldwide, as needed, to troubleshoot and identify harmful RF interference source(s).

  • Case One - Unidentified interference causing blocked/dropped PCS calls
    Issue: Unexplained high level of blocked and dropped calls affecting a single cell site sector
    Cause: Measurements identified an illegal cellular/PCS jammer located at a doctor's office in close proximity to the cell site
    Action: Measurements identified the source of the interference as emanating from the doctor's office and Comsearch field engineers notified the office of the illegal nature of the jammer
    Result: The jammer was permanently disabled, thereby eliminating the interference, which solved the blocked/dropped call issue

  • Case Two - Intermittent interference into a C-Band receive-only earth station
    Issue: Interference into receive-only C-band earth stations that causes severe errored seconds and complete loss of video and audio signals
    Cause: Broadband noise being generated by any number of nearby electrical components with contactors, such as AC and air handling unit and security lights
    Action: Comsearch identified the specific broadband noise components and recommends corrective maintenance activities to mitigate the interference
    Result: Elimination of the source of the broadband noise solved the interference issues, resulting in complete restoration of programming

  • Case Three - Terrestrial interference into a 6 GHz common carrier link
    Issue: A newly installed 6 GHz Common Carrier microwave link was being interfered, with resulting in it not being able to meet its design reliability performance criteria
    Cause: Measurements identified a co-located transmitter that was operating on the opposite polarity from its licensed value
    Action: Comsearch confirmed that the existing system was operating on the wrong polarity, notified the operator accordingly, and stayed on-site until the polarity was switched to its licensed operation
    Results: With the co-located link properly polarized, the interference into the new link was negated, resulting in the new link meeting all design criteria

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