How to List a Test Site

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How to List a Test Site
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Listing an Open Field Site

• William H. Graff
• President and Director of Engineering
• 886 0920399260
• whgraff_at_atcb.com
• Major Chen
• Manager East Asia Branch Office
• 886 0922145866
• major_at_atcb.com

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What is an OATS?

• An Open Area Test Site is the minimum
  requirement, other than measurement
  instrumentation, for making radiated emissions
  measurements

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Reference standard

• The FCC uses ANSI C63.4-2003 for determining the
  suitability of an OATS.
• Standard open air test sites are considered in
  section 5.4.1 of this document
• Semi-anechoic chambers are considered
  alternative test sites and are seen in 5.4.2

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Basic description

• Open, flat and level
• Clear of overhead power lines
• Clear of RF reflecting structures
• Covered with hardware cloth or other conductive
  material
• Minimum dimensions for common 3M OATS is 6M x 5.2M

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Basic Facility

• Must have a remotely controlled antenna
  positioner and mast capable of being raised to 4M
  ad lowered to 1M
• Must have a continuously rotateable remotely
  controlled turntable metal covered and flush with
  the groundplane.

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Antennas

• Must have antennas capable of measurements over
  at a minimum 30MHz to 1GHz.
• If transmitters are to be tested, then the
  laboratory must be mindful that a frequency range
  typically to the 10th harmonic of the fundamental
  measured is required.
• 433MHz key fob needs measurements to 4.3GHz

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Site Attenuation Measurements

• Basic procedures given in 5.4.6.4 and 5.4.6.5 of
  ANSI C63.4
• Measurements must be done on both horizontal and
  vertical planes
• Complex procedures for alternative sites
  include test volume measurements.
• Data must match the theoretical site
  attenuation curve to /- 4dB

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Powerline Conducted Measurements

• Use of a Line Impedance Stabilization Network
  (LISN) is required.
• If used with an OATS, the LISN must be under the
  groundplane.

10
Listed Site Test Report Considerations

• All test equipment and antennas must be
  calibrated.
• All antenna factor tables and LISN loss factors
  must be presented.
• All cables used in tests must be calibrated.
• All photographs shall be clear, in large format,
  and only one to a page

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Submission to FCC

• The site attenuation data along site photographs
  must be submitted electronically to the FCC

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Patience

• It is not unusual for the FCC to take a month or
  more to finish analyzing the Test Site data.
  Expect questions on a new facility when
  information appears unclear to the examiner.
• Be sure to respond quickly to the examiners
  questions.
• Do not test anything until approval is received.

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Questions?

• whgraff_at_atcb.com
• major_at_atcb.com
• jerry_at_atcb.com