Reference Page for NAB Labs All-Digital AM Test Project, Part II

Author:
Publish date:
Social count:
0

Here you will find the Figures and Tables, as well as additional Appendices mentioned in "NAB Labs All-Digital AM Test Project, Part II" published in the June 15, 2016 issue of Radio World Engineering Extra.

Appendix 1

Appendix 2

Appendix 3

Table 1: Test receivers

Table 2: AM test receiver input impedances at 890 kHz

Table 3: AM test receiver threshold of digital reception

Table 4: Phase 1 test matrix. Shaded test numbers indicate test conditions for which audio recordings were made.

Table 5: Phase 2 test matrix. Shaded test numbers indicate test conditions for which audio recordings were made.

Table 6: Organization of audio tracks for six-minute audio source files.

Fig. 1: Test bed RF signal flow diagram

Fig. 2: Test bed audio signal flow diagram.

Fig. 3: Equipment rack layout — RF rack

Fig. 4: Equipment rack layout — audio rack

Fig. 5: Test receivers

Fig. 6: Automotive receiver RF signal interface

Fig. 7: Insignia receiver RF signal interface

Fig. 8: Spectrum analyzer plot showing RF output of test bed with all receivers connected and operating

Fig. 9: Screen cage test setup

Fig. 10: All-digital signal 30 kHz channel power

Fig. 11: Unmodulated analog signal 30 kHz channel power

Fig. 12: RF spectral occupancy with analog pulsed USASI modulation

Fig. 13: RF spectral occupancy with all-digital AM modulation

Fig. 14: RF spectral occupancy with all-digital AM modulation showing extended sideband noise floor

Fig. 15: Lissajous pattern corresponding to 0° phase-locked carriers

Fig. 16: Amplitude vs. time plot showing 0° phase lock

Fig. 17: Amplitude vs. time plot showing 90° phase lock

Fig. 18: Lissajous pattern corresponding to 180° phase-locked carriers

Fig. 19: Amplitude vs. time plot showing 180° phase lock

Fig. 20: Oscilloscope plot showing setting of 1 Hz frequency offset

Fig. 21: Comparison of SNR performance for receiver #2 without (Phase 1) and with (Phase 2) simulated environmental RF noise

Fig. 22: Phase 2 test results for receiver #2

Fig. 23: Phase 2 test results for receiver #1

Fig. 24: Phase 2 test results for receiver #3

Fig. 25: Phase 2 test results for receiver #4

Fig. 26: Phase 2 test results for receiver #5

Fig. 27: Block diagram illustrating the use of the Audio Precision test set to simultaneously generate both the desired (left channel) and undesired (right channel) audio signals

Related