TB 9-6625-2249-24
Table 6. Harmonic Distortion
Synthesized
Spectrum analyzer harmonic amplitude indications
signal generator
Second harmonic
Third harmonic
frequency
settings (GHz)
Frequency (GHz)
Amplitude (dBc)
Frequency (GHz)
Amplitude (dBc)
2.0
4.0
6.0
3.0
6.0
9.0
4.0
8.0
12.0
5.0
10.0
15.0
6.0
12.0
18.0
7.0
14.0
21.0
8.0
16.0
---
---
9.0
18.0
---
---
10.0
20.0
---
---
11.0
22.0
---
---
(5) Measure and record third harmonic frequency amplitude in table 6.
table 6 and repeat (3) through (5) above.
(7) Search table 6 spectrum analyzer harmonic indications for highest second or
third harmonic amplitude indication. Record amplitude level.
(8) Add -20 to highest second or third harmonic amplitude value recorded in (7)
above. SUM will be equal to or less than -20 dBc.
EXAMPLE:
Highest harmonic indication recorded in (7) above is -10 dBc at 6 GHz.
-10.0 (7) above
-20.0 (8) above
-30.0 dBc
(9) Repeat (2) and (3) above.
(10) Tune spectrum analyzer frequency controls from 2 to 18 GHz and record
amplitude of any spurious responses.
(11) Add -20 to spurious response amplitude value recorded in (10) above. Sum will
be equal to or less than -.55 dBc.
EXAMPLE:
Spurious response indication recorded is -40 dBc above is -40 dBc at 6 GHz.
-40.0 (10) above
-20.0 (11) above
-60.0 dBc
(12) Repeat (11) above for remaining spurious responses recorded in (10) above.
b. Adjustments. No adjustments can be made.
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