GENERAL INFORMATION
1-12
MODULATION
FM, AM and ΦM can be applied to the carrier using internal or external modulation
sources. The internal modulation source is capable of generating two simultaneous
signals into any one of the modulation channels. The internal and external modulation
sources can be enabled simultaneously to produce combined amplitude and frequency
(or phase) modulation.
Internal and external IQ modulation can be applied. In this mode, FM, AM and ΦM are
not permitted.
Optional pulse modulation can be used in combination with FM, AM, ΦM and IQ from an
external pulse source.
Frequency modulation
Peak deviation: Frequency Maximum peak deviation
250 kHz to 375 MHz 7.5 MHz
375 MHz to 750 MHz 3.75 MHz
750 MHz to 1.5 GHz 7.5 MHz
1.5 GHz to 3 GHz 15 MHz
3 GHz to 6 GHz 30 MHz
Displayed resolution: 4 digits or 1 Hz
FM accuracy (at 1 kHz rate):
±3% of set deviation, excluding residual FM
FM bandwidth:
0.5 dB DC to 200 kHz (DC coupled, 100 kΩ)
10 Hz to 200 kHz (AC coupled, 100 kΩ)
3 dB Typically 20 MHz (DC or AC coupled, 50 Ω)
Typical FM bandwidth
Carrier frequency offset: For DC coupled FM ± (1 Hz + 0.1% of the set deviation) after performing a DCFM null
operation
Total harmonic distortion: At 1 kHz rate:
< 0.15% for deviations up to 2% of maximum allowed deviation
< 0.6% for deviations up to 20% of maximum allowed deviation
< 1.5% at maximum deviation
Phase modulation
Phase deviation: 0 to 10 radians
Displayed resolution is 4 digits or 0.01 radians
Accuracy (at 1 kHz rate): ± 4% of set deviation excluding residual phase modulation
Bandwidth:
0.5 dB 100 Hz to 10 kHz (AC coupled, 100 kΩ)
Total harmonic distortion: At 1 kHz rate:
< 0.5% at 10 radians deviation
Typically < 0.1% at 1 radian deviation
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