1、 TSB-179-1 October 2013Terrestrial Land Mobile Radio- Antenna Systems- Total “Antenna System” Return Loss Measurements- Addendum 1 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, f
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19、A WITHOUT SUCH LIMITATIONS. TSB-179-1 i Table of Contents 4.4 LATEST SYSTEM RETURN LOSS SPREADSHEET CALCULATOR 1 TSB-179-1 ii FOREWORD (This foreword is not part of this Bulletin) This Addendum is being promulgated by the TIA-8.11 (Antenna Systems) subcommittee and its TR-8.11.5 working group. The T
20、otal “Antenna System” Return Loss Measurements Technical Service Bulletin was created to address the issues associated with measuring the complete RF path and offered some suggestions about how to make measurements that will be more meaningful. TSB-179-1 iii Patent Identification The readers attenti
21、on is called to the possibility that compliance with this document may require the use of one or more inventions covered by patent rights. By publication of this document no position is taken with respect to the validity of those claims or any patent rights in connection therewith. The patent holder
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23、lders and patents have been identified in accordance with the TIA intellectual property rights policy: none. TIA shall not be responsible for identifying patents for which licenses may be required by this document or for conducting inquiries into the legal validity or scope of those patents that are
24、 brought to its attention. TSB-179-1 iv INTRODUCTION The purpose of this addendum is to correct errata contained in TSB-179 Total “Antenna System” Return Loss Measurements. The following problems have been identified: Figures 2 and 3 of Section 4.4 each contain an error. These figures are screenshot
25、s of the System Return Loss Spreadsheet Calculator. In each of the screenshots, a hard coded value of “6.00” was entered for the “Main Feed Line Return Loss” instead of the correct automatically calculated value. Fortunately, in both figures this value did not affect additional calculations in the s
26、heet. However, it could still be a source of confusion for those using the document. TSB-179-1 1 Note that section numbers identified in this addendum directly translate to section numbers in TSB-179. Addendum changes to TSB-179 start here 4.4 Latest System Return Loss Spreadsheet Calculator Figure
27、2 System VSWR Calculator, Perfect Main Feed Line (1.000:1 VSWR) TSB-179-1 2 Figure 3 System VSWR Calculator, Typical Main Feed Line (1.11:1 VSWR) THE TELECOMMUNICATIONS INDUSTRY ASSOCIATION TIA represents the global information and communications technology (ICT) industry through standards developme
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