AS 1417.1(Int)-2011

1 - AS 1417.1(Int)-2011 RECEIVING ANTENNAS FOR RADIO AND TELEVISION IN THE VHF AND UHF BROADCAST BANDS - DESIGN, MANUFACTURE...
4 - PREFACE
5 - CONTENTS
6 - SECTION 1 SCOPE AND GENERAL
6 - 1.1 SCOPE
6 - 1.2 APPLICATION
7 - 1.3 REFERENCED DOCUMENTS
7 - 1.4 DEFINITIONS
7 - 1.4.1 Shall
7 - 1.4.2 Should
7 - 1.4.3 May
8 - SECTION 2 ELECTRICAL SPECIFICATIONS
8 - 2.1 GENERAL
8 - 2.2 ANTENNA SUITABILITY FOR GIVEN RECEPTION AREAS
8 - 2.3 OPERATIONAL FREQUENCY RANGE OR BANDWIDTH
9 - 2.4 ANTENNA GAIN
9 - 2.4.1 General
9 - 2.4.2 Directivity
10 - 2.4.3 Beamwidth (3 dB)
10 - 2.4.4 Front-to-back (FB) ratio
10 - 2.4.5 Front-to-sidelobe ratio
10 - 2.5 CROSS-POLARIZATION PROTECTION
11 - 2.6 ANTENNA OUTPUT
11 - 2.6.1 General
11 - 2.6.2 Antenna baluns
11 - 2.6.3 Antenna impedance and return loss
12 - 2.7 RECOMMENDED ANTENNA PERFORMANCE FOR DIGITAL TV SERVICES
14 - SECTION 3 MECHANICAL SPECIFICATIONS
14 - 3.1 GENERAL
14 - 3.2 ANTENNA WIND LOAD PRESSURES AND FORCES
14 - 3.3 STATIC LOADS
14 - 3.4 WEIGHT
14 - 3.5 DIMENSIONS
14 - 3.6 MATERIALS
14 - 3.7 HARDWARE AND FITTINGS
15 - 3.8 TERMINAL DEVICE ROBUSTNESS
15 - 3.9 ENVIRONMENTAL REQUIREMENTS
15 - 3.9.1 Corrosion resistance
15 - 3.9.2 Other physical properties
15 - 3.9.3 Weatherproofing
16 - SECTION 4 DETAILED SPECIFICATION SHEET FORMAT
16 - 4.1 GENERAL
16 - 4.2 RECOMMENDED FORMAT FOR SPECIFICATION SHEET
18 - APPENDIX A - ANTENNA GAIN, DIRECTIONAL PATTERN AND RETURN LOSS MEASUREMENT TECHNIQUES
18 - A1 GENERAL
18 - A2 MEASUREMENTS USING NORMAL OFF-AIR TV TRANSMISSIONS
18 - A2.1 Test set-up
19 - A2.2 Gain comparison
19 - A2.3 Front-to-back (FB) ratio measurement
19 - A3 GAIN MEASUREMENT USING A TEST RANGE AND TEST SIGNAL TRANSMISSIONS
19 - A3.1 General
19 - A3.2 Antenna test range requirements
20 - A3.3 Minimizing multipath reflections
22 - A3.4 Antenna separation and near-field and far-field effects
22 - A3.5 Test location EM interference
22 - A4 GAIN MEASURED BY THE SUBSTITUTION METHOD
22 - A4.1 General
23 - A4.2 Equipment requirements for substitution test
25 - A4.3 Alternative test method
26 - A4.4 Front-to-back (FB) ratio
27 - A4.5 Half-power beamwidth and directional pattern tests
27 - A4.6 Directional pattern tests
27 - A5 GAIN MEASUREMENT BY THE RECIPROCITY METHOD
27 - A5.1 General
29 - A5.2 Reciprocity test method
30 - A6 CROSS-POLARIZATION TESTS
30 - A6.1 General
31 - A6.2 Suggested method for crossŒpolarization measurement
31 - A7 ANTENNA RETURN LOSS (RL) MEASUREMENT
31 - A7.1 General
32 - A7.2 Equipment required
32 - A7.3 Suggested method
33 - APPENDIX B - GLOSSARY, ACRONYMS AND DEFINITIONS
37 - APPENDIX C - ANTENNA SPECIFICATION SHEET EXAMPLE
38 - APPENDIX D - BROADCAST BAND CHANNEL EXTENTS AND CENTRE FREQUENCIES
40 - APPENDIX E - DIGITAL TV ANTENNA GAIN AND SIGNAL STRENGTH REQUIREMENTS AND MEASUREMENTS
40 - E1 GENERAL
40 - E2 THE DIGITAL CLIFF EFFECT
41 - E3 DIGITAL ERROR CORRECTION SYSTEMS
41 - E4 CHECKING A DIGITAL TV SIGNAL WITH A DIGITAL TV SIGNAL QUALITY METER
41 - E4.1 General
43 - E4.2 Minimum 9 dB margin recommended
43 - E5 DIGITAL RECEPTION MARGIN
44 - E6 SYSTEMS WITH AMPLIFIERS
44 - E7 C/N THRESHOLDS AND REQUIRED SIGNAL LEVELS
45 - E8 CALCULATION OF THE LIKELY SIGNAL MARGIN IN STRONG, MEDIUM OR WEAK SIGNAL AREAS
45 - E9 DETERMINING TYPE OF ANTENNA REQUIRED
48 - APPENDIX F - F-TYPE CONNECTOR ADVISORY MODIFICATIONS
48 - F1 F-CONNECTOR-GENERAL
48 - F2 RECOMMENDATIONS
49 - APPENDIX G - DETAILS OF A 75 Ω TRANSFER STANDARD ANTENNA
49 - G1 TRANSFER-STANDARD ANTENNA
49 - G2 ADJUSTMENT TO DIGITAL CHANGES
49 - G3 GAIN AND RETURN LOSS CHANGES

This Interim Standard covers the design and manufacture of antenna for reception of digital terrestrial TV transmitted in the high VHF and UHF bands. It also covers measurement procedures that may be used to determine the performance of the antenna. This part is aimed specifically at manufacturers to create products suitable to the Australian environment.

This Interim Standard specifies the minimum electrical performance, aspects of mechanical design and methods of measurement of antennas for reception of terrestrial digital television broadcasts.Requirements for analogue television transmissions are not considered in this Interim Standard. Analogue television transmissions in Australia are in the process of being switched off, with this process to be completed by 2013.NOTE: This Interim Standard only considers receiving antennas suitable for Australian digital terrestrial television services that operate in VHF Band III, and UHF Bands IV and V.Band I or Band II reception capabilities are not required for Australian digital television, and Band I low VHF reception capability for analogue channels 0 to 2 should not be included, because this may be detrimental to the required performance for digital television channels.To provide reliable uniformity to antenna performance specifications and as an indication of suitability of an antenna for reception of DVB-T signals, information on methods of measurement is given, including aspects of COFDM measurement such as bit error ratio (BER) and modulation error ratio (MER).NOTE: Appendix A gives details of infield measurements and some practical examples of expected results for a range of signal conditions and different antenna types.A possible future Part 2 of this Interim Standard will cover mechanical aspects of the installation of outdoor television receiving antennas. For details of how an antenna output should be distributed to multiple outlets such as required in multi-unit-dwellings, refer to AS/NZS 1367. NOTE: Additional ancillary requirements may include (integral) filters for rejection of interference from devices using adjacent spectrum such as LTE mobile telephony and ‘white space’ devices (for wireless computer connections).

Originated as AS CC8-1962.Previous edition AS 1417.1-1987.Third edition 2011. Originated as AS CC8 1962. Previous edition AS 1417.1 1987. Third edition 2011.