Cellphones and Licensed Radio Reports

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Cellphones and Licensed Radio Reports
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What is a Licensed Transmitter?

• Licensed transmitters are devices which have been
  granted specific sections of the radio frequency
  spectrum for their use.
• Equipment authorized for these services
  theoretically must also go through the Wireless
  Bureau before being placed in service

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Is a Licensed transmitter an Intentional
Radiator?

• An Intentional Radiator is a legal term used
  exclusively for Unlicensed Part 15 radio
  transmitters. Do not confuse the usage of the
  term within the Rules.

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Test Report Construction Notes

• All Licensed devices use portions of TIA/EIA 603
  as a basis for some testing and report
  construction.
• It is not recommended that any laboratory begin
  Licensed radio testing without a full
  understanding of Part 15B and 15C report
  building.

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Building a Test Report

• Licensed radio test reports use a completely
  different technique for referencing the
  applicable FCC rules then Part 15.
• Extensive use of Part 2 is required.
• Part 2 is the oldest section of the Rules
• Additional service-specific rules (Part 22/24 or
  Part 90) require additional tests and
  documentation

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Required Exhibits

• AmericanTCB has its own easy-to-use application
  form in MS Word format for use in all filings. A
  completed Application is required before any work
  can proceed.
• In addition to the Test Report a number of
  specific Exhibits are required.

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Exhibits which accompany all filings

• Label
• Internal Photographs
• External Photographs
• Cover Letters
• Operational Description
• Schematics
• Block Diagrams
• Manual
• Test Setup Photographs
• Can be held Confidential

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Additional Exhibits

• Parts List
• Tune-Up Procedures
• SAR Report (if required)
• Test Setup Photos can legally be omitted, but
  this is not recommended

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RF Exposure

• RF Exposure is a complex area and is relatively
  one of the newest sections of the Rules.
  Requirements are still changing and may need
  additional care before testing or filing
• Check and consult with ATCB to determine if any
  recent regulatory changes

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Finding FCC Regulations

• The Government Printing Office now provides
  on-line FCC Rules.
• These are the most recent available and usually
  are the best for updates
• http//ecfr.gpoaccess.gov/cgi/t/text/text-idx?cec
  frtpl2Findex.tpl

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Part 2

• Part 2 is the oldest section of the Rules.
• It dates back to a pre-standards era with FCC
  equipment authorization procedures
• It has withstood the challenge of time and is
  still very valid to this day

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2.201 Emission Designators

• Emission designators are required for all
  Licensed radio services.
• They inform the Wireless Bureau in a shorthand
  manner of the kinds of emissions to be expected
  from a specific radio transmitter.
• Examples
• 1M25F9W CDMA
• 11K5F3E Narrowband analog voice
• 300KGXW GSM

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2.1046 RF Power Output

• Licensed devices where the antenna is not
  supplied by mfg peak conducted power
• Licensed devices where the antenna is
  non-detachable peak radiated power
• For Part 22 ERP
• For Part 24 - EIRP

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Radiated power measurements

• Substitution measurements as described in TIA/EIA
  603 are required.
• For UHF frequencies and above consider the
  effects of impedance mismatch and cable shield
  radiation.
• Use ferrites on substitution cable
• Measure SWR
• Determine the real power loading on the
  substitution antenna
• Accuracies to .3dB have been demonstrated.

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2.1047 Modulation Characteristics

• This section requires testing for analog systems
  which change emission envelope relative to the
  frequency and amplitude of the intelligence.
• See TIA/EIA 603
• Digital systems which employ a constant
  envelope fundamental can simply provide a
  description of the modulating intelligence.

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2.1049 Occupied Bandwidth

• A spectral plot of the emission at highest and
  lowest powers.
• A low/high power plot for each emission type for
  each is required.
• For multiple data rates usually worst case will
  suffice.
• Analog systems should reference TIA/EIA 603 for
  procedure

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2.1051 / 2.1053 Spurious Emissions

• This is two tests
• Conducted spurs from the antenna port
• Radiated emissions from the cabinet using a
  terminated transmitter
• However, for devices with integral or
  non-detachable antennas a radiated test only is
  sufficient using the antenna supplied by
  manufacturer
• Substitution method is required.

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2.1055 Frequency Stability

• Frequency variation over temperature
• Usually -30C to 50C.
• Frequency variation over voltage
• Usually /- 15 of Standard Test Voltage
• If battery operated, an additional test at the
  Battery End Point is recommended

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Additional Rule Specific Tests

• Specific tests are required for all Licensed rule
  parts.
• For Cellphones, the additional rules found in
  Part 22/24 apply.
• For IDEN additional rules are found in Part 90
• Marine radios Part 80
• FRS Part 95
• Consult with ATCB for additional applicable rule
  sections.

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Part 22/24

• Cellphones require additional emissions testing
  at the band edge.
• Easiest to perform using conducted measurements,
  but radiated methods can be used.
• Fairly explicit instructions can be found in
  either 22.359(b) or 24.238(b).
• For questions contact ATCB

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2.1033(c)(8)

• FCC rules require noting the voltage and current
  through the final radio frequency amplification
  device be listed in the Test Report.
• This does not have to be a hard test. If needed
  ATCB will provide you with a simple method for
  obtaining these values.

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15.19(a)(1) Labeling

• End users of receivers used with Licensed radio
  services have specific rights not given to other
  Part 15 operations. Their labeling in addition to
  the FCC ID should read
• This device complies with part 15 of the FCC
  Rules. Operation is subject to the condition that
  this device does not cause harmful interference.

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Questions?

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