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Section 6
Performance Tests
6-17
Resolution bandwidth (RBW) and selectivity
If there are two input signals with the frequency difference corresponding to 3 dB
bandwidth (of IF final stage), these signals can be resolved as two spectrum waveforms.
This is called the resolution bandwidth.
Selectivity can be improved by narrowing the 60 dB bandwidth. The selectivity is
defined by the ratio of the filter width, in Hz, at the –60 dB point, to the filter width, in
Hz, at the –3 dB point, as shown in the formula below.
Center frequency
3 dB
bandwidth
60 dB
bandwidth
3 dB
60 dB
Frequency
60 dB bandwidth (Hz)
3 dB bandwidth (Hz)
Selectivity =
To test the resolution bandwidth and selectivity, first measure the resolution bandwidth
(3 dB bandwidth), then the 60 dB bandwidth and calculate the 60 dB/3 dB bandwidth
ratio.
(1) Specifications
•
Resolution bandwidth accuracy:
±
20% (RBW=300 Hz to 10 MHz)
±
40% (RBW=20 MHz)
•
Selectivity (60 dB/3 dB bandwidth):
≤
15:1
(2) Test instrument
•
Synthesized signal generator:
MG3633A
Amplitude
Содержание MS8608A
Страница 18: ...II...
Страница 19: ...MS8608A MS8609A Digital Mobile Radio Transmitter Tester Operation Manual Vol 1 Main Unit Panel Operation...
Страница 22: ...IV...
Страница 24: ...Section 1 General 1 2...
Страница 46: ...Section 1 General 1 24...
Страница 48: ...Section 2 Preparations Before Use 2 2...
Страница 58: ...Section 2 Preparations Before Use 2 12...
Страница 60: ...Section 3 Panel Description 3 2...
Страница 68: ...Section 4 Basic Operation Procedure 4 2...
Страница 78: ...Section 5 Setting Functions 5 2...
Страница 112: ...Section 5 Setting Functions 5 36...
Страница 114: ...Section 6 Performance Tests 6 2...
Страница 170: ...Section 7 Storage and Transportation 7 2...
Страница 174: ...Section 7 Storage and Transportation 7 6...
Страница 176: ...Appendixes App II...
Страница 178: ...Appendix A A 2...
Страница 179: ...A 3 Fig A 1 MS8608A Front Panel...
Страница 180: ...A 4 Fig A 2 MS8608A Rear Panel Name Plate...
Страница 181: ...A 5 Fig A 3 MS8609A Front Panel...
Страница 182: ...A 6 Fig A 4 MS8609A Rear Panel...
Страница 184: ...Appendix B B 2...
Страница 186: ...B 4...
Страница 187: ...Appendix C C 1 Appendix C Performance Test Record...
Страница 188: ...Appendix C C 2...
Страница 204: ...Appendix C C 18...
Страница 205: ...MS8608A MS8609A Digital Mobile Radio Transmitter Tester Operation Manual Vol 1 Main Unit Remote Control...
Страница 208: ...IV...
Страница 210: ...SECTION 1 GENERAL 1 2...
Страница 216: ...SECTION 2 CONNECTING DEVICE 2 2...
Страница 220: ...SECTION 2 CONNECTING DEVICE 2 6...
Страница 222: ...SECTION 3 DEVICE MESSAGE FORMAT 3 2...
Страница 234: ...SECTION 4 STATUS STRUCTURE 4 2...
Страница 248: ...SECTION 4 STATUS STRUCTURE 4 16...
Страница 250: ...SECTION 5 INITIAL SETTINGS 5 2...
Страница 256: ...SECTION 5 INITIAL SETTINGS 5 8...
Страница 258: ...SECTION 6 TABLES OF DEVICE MESSAGES 6 2...
Страница 266: ...SECTION 6 TABLES OF DEVICE MESSAGES 6 10...
Страница 268: ...7 2 SECTION 7 DETAILED DESCRIPTION OF COMMANDS...
Страница 330: ...7 64 SECTION 7 DETAILED DESCRIPTION OF COMMANDS...
Страница 332: ...App ii APPENDIXES...
Страница 336: ...APPENDIX A A 4...