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5-7
Spectral purity
Specification
Harmonics
Typically better than −30 dBc for levels up to +7 dBm,
typically better than −25 dBc for levels 6 dB below the maximum specified output.
Non-harmonics (offsets >
3 kHz)
Better than −70 dBc for carrier frequencies up to 1 GHz,
better than −64 dBc for carrier frequencies above 1 GHz,
better than −60 dBc for carrier frequencies above 2 GHz.
Residual FM (FM off) Less than 4.5 Hz RMS in a 300 Hz to 3.4 kHz bandwidth at a carrier frequency of
1 GHz.
SSB phase noise
Better than −124 dBc/Hz at 20 kHz offset from a 470 MHz carrier.
Typically −121 dBc/Hz at 20 kHz offset from a 1 GHz carrier.
Test equipment
Description Minimum specification Example
Spectrum
analyzer
DC to 7.2 GHz frequency coverage Anritsu MS2602A
Measuring
receiver
0 dBm to −127 dBm; 2.5 MHz to 2.4 GHz Capable
of measuring residual FM less than 2 Hz and SSB
phase noise <−124 dBc/Hz at 20 kHz offset from a
1 GHz carrier
Agilent 8902A
with option 037
Signal generator +8 dBm from 32.5 MHz to 2.43 GHz IFR 2041
Harmonics
Test procedure
C5357
RF OUT
RF INPUT
UUT
Spectrum analyzer
Fig. 5-4 Carrier harmonics and non-harmonics test set-up
(1) Press CAL on the spectrum analyzer.
(2) Connect the test equipment as shown in Fig. 5-4.
(3) On the UUT set:
Carr Freq 10 kHz
RF Level −4 dBm