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PRESENTED TONRSC DAB SUBCOMMITTEE
BYTOM F. KING
PRESIDENT, KINTRONIC LABORATORIES, INC.
TEST RESULTS OF NAUTEL AM IBOC HDTEST RESULTS OF NAUTEL AM IBOC HDTRANSMITTER PERFORMANCE TRANSMITTER PERFORMANCE
VERSUSVERSUSANTENNA LOAD IMPEDANCEANTENNA LOAD IMPEDANCE
CHARACTERISTICSCHARACTERISTICS
APRIL 5, 2003
• NO AM ANTENNA SYSTEM REQUIREMENTS FOR HD RADIO SUBSTANTIATED BY DOCUMENTED TEST RESULTS HAVE BEEN PUBLISHED
• HD RADIO IS NOW BEING IMPLEMENTED IN THE US MARKET
• AS A LEADING PROVIDER OF AM ANTENNA SYSTEMS IN THE US MARKET, IT IS OF VITAL INTEREST TO KINTRONIC LABS TO PROVIDE ACCURATE DESIGN CRITERIA FOR HD TRANSMITTERS TO POTENTIAL CUSTOMERS
BACKGROUNDBACKGROUND
• TO ASSESS THE EFFECTS OF ANTENNA LOAD SIDEBAND VSWRON TRANSMITTER BIT ERROR RATE (BER)
• TO ASSESS THE EFFECTS OF ANTENNA LOAD CUSP ORIENTATION ON TRANSMITTER BER
• TO ASSESS THE EFFECTS OF ANTENNA LOAD SIDEBAND VSWR AND CUSP ORIENTATION ON RECEIVED AUDIO SIGNAL QUALITY, I.E., HYBRID, MARGINAL DIGITAL+ANALOG, OR ANALOG ONLY
• TO DEVELOP AM ANTENNA SYSTEM CRITERION FOR RELIABLEHD TRANSMISSION SYSTEM OPERATION
HD DAB TEST GOALSHD DAB TEST GOALS
IBOC HD DABTEST SETUP BLOCK DIAGRAM
IBOC DABANTENNA LOAD SIMULATOR
NAUTEL ND1 HD TRANSMITTER AND IBIQUITY RECEIVER
NAUTEL ND1 AM TRANSMITTER
NAUTEL AM IBOC EXCITER
IBIQUITY AM HD RECEIVER
IBIQUITY HD TEST RECEIVER
EXAMPLE OF SIMULATED ANTENNA LOAD PASSBAND SWEEP
EXAMPLE OF SIMULATED ANTENNA LOAD PHASE SHIFT CHARACTERISTICS
PHASE SHIFT OF ND1 OUTPUT NETWORK
*HP 4396 NETWORK ANALYZER PLOT
5V/div
-53°
EXAMPLE OF 3:00 CUSP ROTATION
EXAMPLE OF 6:00 CUSP ROTATION
EXAMPLE OF 12:30 CUSP ROTATION
TEST RESULTS FOR 3:00 CUSP ROTATION
1.00
1.20
1.40
1.60
1.80
2.00
2.20
2.40
2.60
2.80
fc-20 fc-15 fc-10 fc-5 fc fc+5 fc+10 fc+15 fc+20
FREQUENCY (kHz)
VS
WR
PERFECT HYBRID RECEPTION2 LOCK LOSSES IN 5 MIN7 LOCK LOSSES IN 5 MIN9 LOCK LOSSES IN 5 MIN
ANALOG ONLY
0000
6.3 x 10-4
AUDIO RECEPTION BER
TEST RESULTS FOR 6:00 CUSP ROTATION
1.00
1.20
1.40
1.60
1.80
2.00
2.20
2.40
2.60
2.80
fc-20 fc-15 fc-10 fc-5 fc fc+5 fc+10 fc+15 fc+20
FREQUENCY (kHz)
VS
WR
PERFECT HYBRID RECEPTION
4 LOCK LOSSES IN 5 MIN
46 LOCK LOSSES IN 5 MIN
000
AUDIO RECEPTION BER
PERFECT HYBRID RECEPTION INDEPENDENTOF CUSP ROTATION FOR ILLUSTRATED PASSBAND
1.00
1.10
1.20
1.30
1.40
1.50
1.60
fc-20 fc-15 fc-10 fc-5 fc fc+5 fc+10 fc+15 fc+20
FREQUENCY (kHz)
VS
WR
1.00
1.20
1.40
1.60
1.80
2.00
2.20
fc-20 fc-15 fc-10 fc-5 fc fc+5 fc+10 fc+15 fc+20
FREQUENCY (kHz)
VS
WR
BER vs. CUSP ROTATION FOR +/- 10kHz VSWR < 1.4:1
ANALOG ONLY4.8 x 10-512:30
11 LOCK LOSSES/5MIN3.0 x 10-51:30
3.5 LOCK LOSSES/5MIN5.2 x 10-62:00
15 LOCK LOSSES/5MIN8.9 x 10-62:30
PERFECT03:00
AUDIO QUALITY
BERCUSPROTATION
1.00
1.20
1.40
1.60
1.80
2.00
2.20
2.40
fc-20 fc-15 fc-10 fc-5 f c fc+5 fc+10 fc+15 fc+20
FREQUENCY (kHz)
VS
WR
BER vs. CUSP ROTATION FOR +/- 10kHz VSWR < 1.5:1
35 LOCK LOSSES/5MIN1.8 x 10-63:00
7 LOCK LOSSES/5MIN2.06 x 10-54:00
1 LOCK LOSSES/5MIN05:00
PERFECT06:00
AUDIO QUALITY
BERCUSPROTATION
CONCLUSIONSCONCLUSIONS
SIDEBAND VSWR THRESHOLD FOR PERFECT HYBRID DIGITAL + ANALOG RECEPTION INDEPENDENT OF CUSP ORIENTATION
1.00
1.10
1.20
1.30
1.40
1.50
1.60
VSWR THRESHOLD
ANTENNA LOAD SIDEBANDS (kHz)
VSWR 1.11 1.25 1.40 1.55
± 5 ± 10 ± 15 ± 20
SIDEBAND VSWR THRESHOLD FOR PERFECT HYBRID DIGITAL +ANALOG RECEPTION FOR 3:00 AND 6:00 CUSP ORIENTATION
1.00
1.20
1.40
1.60
1.80
2.00
2.20
VSWR THRESHOLD
ANTENNA LOAD SIDEBAND (kHz)
3:00 CUSP ROTATION
6:00 CUSP ROTATION
3:00 CUSP ROTATION 1.16 1.34 1.56 1.82
6:00 CUSP ROTATION 1.22 1.47 1.79 2.18
± 5 ± 10 ± 15 ± 20
SIDEBAND VSWR THRESHOLD AT WHICH DIGITAL RECEPTION DROPOUT OCCURS FOR 3:00 CUSP ORIENTATION
1.00
1.20
1.40
1.60
1.80
2.00
2.20
2.40
VSWR THRESHOLD
ANTENNA LOAD SIDEBANDS (kHz)
Series1 1.23 1.50 1.85 2.27
± 5 ± 10 ± 15 ± 20
• ALL RESULTS SHOWN ARE CONCLUSIVE, EXCLUDING ANY PROPAGATION PATH EFFECTS
• ALL RESULTS SHOWN APPLY FOR THE NAUTEL ND1 TRANSMITTER, WHICH UNIQUELY UTILIZES AN OUTPUT NETWORK WITH ZERO PHASE SHIFT. OTHER TRANSMITTER MAKES AND MODELS MAY YIELD DIFFERENT RESULTS
• BIT ERROR RATE IS NOT A FULL INDICATOR OF DIGITAL RECEPTION QUALITY
GENERAL CONCLUSIONSGENERAL CONCLUSIONS