Presentation on theme: "Washington Laboratories (301) 417-0220 web: www.wll.com7560 Lindbergh Dr. Gaithersburg, MD 20879 Cellphones and Licensed Radio Reports."— Presentation transcript:
Washington Laboratories (301) 417-0220 web: www.wll.com7560 Lindbergh Dr. Gaithersburg, MD 20879 Cellphones and Licensed Radio Reports
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
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.
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.
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. oPart 2 is the oldest section of the Rules Additional service-specific rules (Part 22/24 or Part 90) require additional tests and documentation
Required Exhibits AmericanTCB has it’s 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.
Exhibits which accompany all filings oLabel oInternal Photographs oExternal Photographs oCover Letters oOperational Description* oSchematics* oBlock Diagrams* oManual oTest Setup Photographs o* Can be held “Confidential”
Additional Exhibits oParts List* oTune-Up Procedures* oSAR Report (if required) Test Setup Photos can legally be omitted, but this is not recommended
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 oCheck and consult with ATCB to determine if any recent regulatory changes
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?c=ecfr&tpl=%2Findex.tpl
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
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: o1M25F9W CDMA o11K5F3ENarrowband analog voice o300KGXWGSM
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 oFor Part 22 – ERP oFor Part 24 - EIRP
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. oUse ferrites on substitution cable oMeasure SWR oDetermine the “real” power loading on the substitution antenna oAccuracies to.3dB have been demonstrated.
2.1047 – Modulation Characteristics This section requires testing for analog systems which change emission envelope relative to the frequency and amplitude of the intelligence. oSee TIA/EIA 603 Digital systems which employ a “constant envelope” fundamental can simply provide a description of the modulating intelligence.
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
2.1051 / 2.1053 – Spurious Emissions This is two tests: oConducted spurs from the antenna port oRadiated 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.
2.1055 Frequency Stability Frequency variation over temperature oUsually -30C to +50C. Frequency variation over voltage oUsually +/- 15% of Standard Test Voltage oIf battery operated, an additional test at the Battery End Point is recommended
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 oConsult with ATCB for additional applicable rule sections.
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). oFor questions contact ATCB
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.
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: oThis 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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