FREQUENCY MODULATION 
  39 
 
When the deviation is added to the center frequency, the 
result must be smaller than the rating frequency. 
Center Frequency + Deviation ≤ 
Rating(4,7,10,20MHz) 
When this rule is violated, the “Freq-Err3” error 
message appears and the FM setting will be cancelled. 
 
For more error message details, see page52. 
Center frequency (=Output frequency) must be set 
within this range. 
SFG-2104 
300kHz ~ 3.7MHz 
SFG-2107 
300kHz ~ 6.7MHz 
SFG-2110 
300kHz ~ 9.7MHz 
 
SFG-2120 
300kHz ~ 19.7MHz 
 
SFG-2000 series uses an internal 
400Hz sine wave as the default 
modulating signal. 
1.  Connect the modulating signal to 
the rear panel terminal. 
2.  Press the Shift key, then 0 (EXT 
MOD). External modulation is 
activated. 
0
 
EXT
 
Use external 
modulating 
signal 
Frequency 
Range 
1kHz (fixed) 
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