ACCEPTANCE TESTING
7-13
Spectral purity
Specification
Harmonics:
Typically better than −30 dBc for RF levels up to +7 dBm
Typically better than −25 dBc for RF levels up to +13 dBm
Sub- and non-harmonics:
for offsets >3 kHz
Better than −70 dBc for carrier frequencies up to 1 GHz
Better than −64 dBc for carrier frequencies between 1 and 2.05 GHz
Better than −60 dBc for carrier frequencies above 2 GHz
Residual FM:
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
RF leakage:
Less than 0.5 μV at the carrier frequency into a two-turn 25 mm loop
25 mm away from the surface of the signal generator
Test equipment
Description Minimum specification Example
Spectrum
analyzer
DC to 7.6 GHz frequency coverage Anritsu MS2602A
Measuring
receiver
0 dBm to −127 dBm; 2.5 MHz to 2.51 GHz.
Capable of measuring residual FM <2 Hz and SSB
phase noise <
−124 dBc/Hz at 20 kHz offset from a
470 MHz carrier
Agilent 8902A
with Option 037
Low noise signal
generator
+8 dBm from 32.5 MHz to 2.54 GHz
SSB phase noise <−127 dBc/Hz from a 470 MHz
carrier
Aeroflex 2041
50 Ω load 1 W, 50 Ω nominal impedance, DC to 2.51 GHz
Lucas Weinschel
M1404N
2 turn loop 25 mm diameter
Harmonics (not Option 3 or 11)
Test procedure
UUT
Spectrum analyzer
C5803
RF OUTPUT
RF INPUT
Fig. 7-4 Carrier harmonics and sub- and non-harmonics test set-up
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