TB 9-4931-527-50
(6) Adjust function/arbitrary generator output level until the spectrum analyzer
indicates the TI carrier signal nulls into noise baseline as shown in figure 4. (The level
should be adjusted so that the TI signal null is half way between the two levels at which the
carrier comes out of the noise.)
Figure 4. First carrier null of
carrier frequency.
(8) Set function/arbitrary generator frequency to 640 kHz.
(9) Connect equipment as shown in figure 3, CONNECTION B, using frequency doubler.
(10) Adjust spectrum analyzer until the second harmonic of the doubled carrier
frequency signal (approximately 1600 MHz) can be observed. Again use optimum settings
value noted in (7) above. Note function/arbitrary generator output level dBm setting.
(12) Readjust function/arbitrary generator output level for a carrier null on spectrum
analyzer, as shown in figure 4, and note change in function/arbitrary generator output dBm
level. Level change will be less than 0.04 dBm of output level noted in (11) above.
b. Adjustments. No adjustments can be made.
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.