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On-site RF data collection

Passive Wireless Site Survey

A passive wireless survey captures real-world RF conditions throughout an existing environment without connecting the survey device to the wireless network or generating test traffic.

RSSISNRNoiseCh overlapPASSIVE RF DATA COLLECTIONAccess pointSurvey path

What it is

A passive survey is performed on-site using professional RF survey equipment. The engineer walks the defined survey paths while the equipment listens to wireless activity across the supported frequency bands.

The survey captures actual RF conditions from the deployed wireless environment, including coverage, signal quality, access point visibility, and channel usage. Noise measurements and non-Wi-Fi interference identification depend on the equipment and any agreed spectrum-analysis scope.

Because the survey device does not need to authenticate to the network, passive surveys are well suited for coverage assessments, health checks, troubleshooting, post-change reviews, and documentation of an existing wireless environment.

How it works

  1. Step 01

    Prepare Floor Plans

    Calibrate drawings, confirm survey boundaries, and define the survey path.

  2. Step 02

    Collect On-Site RF Data

    Walk the facility using professional RF survey equipment.

  3. Step 03

    Analyze Wireless Conditions

    Evaluate coverage, signal quality, channel overlap, and supported noise measurements; investigate non-Wi-Fi interference when spectrum analysis is included.

  4. Step 04

    Document Findings

    Produce heatmaps, observations, and engineering recommendations.

What it captures

Available measurements may vary based on the survey platform, wireless environment, frequency bands, and project scope.

  • Signal Strength

    Measures received wireless signal levels throughout the surveyed environment.

  • Signal-to-Noise Ratio

    Evaluates the relationship between usable wireless signal and the surrounding RF noise floor.

  • Noise Floor

    Measures background RF energy that may affect wireless performance.

  • Access Point Coverage

    Identifies which access points and radios are visible in different areas of the facility.

  • Channel Utilization and Overlap

    Evaluates channel reuse, co-channel contention, and potential adjacent-channel concerns.

  • Wi-Fi and RF Interference

    Highlights channel contention and potential RF concerns. Identifying non-Wi-Fi interferers requires suitable spectrum-analysis equipment and an agreed investigation scope.

When to Engage NetRobin

Request a passive survey when you need a measured coverage and RF baseline for an existing facility. It is useful before redesign or optimization; client-connected roaming and application checks require an active survey scope.

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Related engineering resources

Why do we have Wi-Fi dead zones, and how are they properly identified?Logistics & Warehousing wireless engineering

When it is recommended

  • Existing wireless coverage concerns
  • User-reported connectivity issues
  • Wireless health assessments
  • Pre-refresh environment reviews
  • Post-configuration-change verification
  • Documentation of the current RF environment

Explore other survey options

Different objectives call for different survey types. Explore the other options in the wireless survey portfolio.

Return to Wireless Site SurveysExplore Survey Methodology