Keysight Technologies N9340B, Руководство пользователя

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Key Reference

MODE
122
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:
• FCC (AM-73.44)
• NRSC-5-B Hybrid 5k
• NRSC-5-B Hybrid 8k
• NRSC-5-B All Digital
Figure 5-1 IBOC (AM) spectral emission mask and limits
-80 -6 0 -4 0 -20 0 20 4 0 60 80
-1 10
-1 00
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
Offse t fro m c arrier frequ enc y (k Hz)
Le
vel
r
e
la
tiv
e
t
o unm
o
du
lat
ed
c
ar
ri
er
(d
B
c)
IB OC (A M ) spec tral em ission m a sk and lim it s
Trace in red is FCC spectral emission mask. 
Trace in blue is NRSC hybrid 5 kHz spectral emissions limits.

Trace in magenta is NRSC hybrid 8 kHz spectral emissions limits. 
Trace in Black is NRSC all digital spectral emissions limits.