Test Procedure SME
1038.6002.02 5.12 E-13
Mixer nonharmonics
of the output part
Setting at the SME Search at frequency
93.75 MHz 131.25 MHz
93.75 MHz 37.5 MHz
93.75 MHz 56.25 MHz
70.0 MHz 40.0 MHz
Nonharmonics of the
summing loop
Setting at the SME Search in the ratio
1412.9 MHz 300.0 kHz
1305.4 MHz 300.0 kHz
1197.9 MHz 300.0 kHz
1090.4 MHz 300.0 kHz
838.25 MHz 117,6 kHz
380 MHz 425.5 kHz
1495.59 MHz 15.59 MHz
1354.0625 MHz 14.2567 MHz
1354.0625 MHz 28.5133 MHz
5.2.7 SSB Phase Noise
Test equipment
- Second signal generator (Section 5.1 item 5),
- Phase noise test system, consisting of mixer with lowpass filter and
preamplifier (Section 5.1 item 6),
- Oscilloscope (Section 5.1 item 7)
- Spectrum analyzer (Section 5.1 item 2).
Test principle The two signal generators are set to the test frequency and
synchronized with a phase offset of 90 deg (phase quadrature). Mixing
to 0 Hz suppresses the RF carrier and due to the phase quadrature
the mixer supplies a voltage corresponding to the phase difference
between the input signals. This is measured by the LF spectrum
analyzer and can be converted into SSB phase noise.
Test setup
×
Ø
S
M
E
RF
Signal generator
Mixer
preamplifier
10-MHz reference
LF analyzer
LO
Oscilloscope
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