Keysight Technologies N9340B User Manual page 128

Key Reference
MODE
Mask Fuction
Key access: [MODE] > {IBOC Measurement} > {AM}/{FM}
> {Mask Function}
Accesses the submenu to configure the mask related
settings.
• Mask Type
There are two types of mask in spectrum mask
measurement for IBOC standard: FCC spectral
emission mask and NRSC spectral emission limits.
NRSC spectral emission is leveraged from the related
specifications of iBiquity Digital Corporation.
The mask types for IBOC-AM are listed as below:
•
•
•
•
Figure 5-1 IBOC (AM) spectral emission mask and limits
-1 00
-1 10
Trace in
Trace in
Trace in
Trace in Black is NRSC all digital spectral emissions limits.
122
FCC (AM-73.44)
NRSC-5-B Hybrid 5k
NRSC-5-B Hybrid 8k
NRSC-5-B All Digital
IB O C (A M ) spec tral em ission m a sk and lim it s
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-80 -6 0 -4 0
red is FCC spectral emission mask.
blue is NRSC hybrid 5 kHz spectral emissions limits.
magenta is NRSC hybrid 8 kHz spectral emissions limits.
-20 0
O ffse t fro m c arrier frequ enc y (k Hz)
20 4 0 60 80