Test Equipment:

Agilent 8662A (and 8644A), fo = 100 MHz, Ref: FM rate = 1 kHz,

Settings

FM deviation: 7.5 kHz
Agilent 8902A: No filters, no pre-emphasis, auto tuning
Agilent 8903B: Audio signal source
Agilent 3561A: 1.5 Hz BW, Hanning filter

  

FM Rate

S/N

1 kHz

-68 dB

500 Hz

-65 dB

200 Hz

-54 dB

100 Hz

-53 dB

20 Hz

-53 dB

10 Hz

-53 dB

1 Hz

-53 dB

 

Data taken from one 8902A
Signal to noise (S/N) measurements were identical using Agilent 8662A and 8644A sources