TB 9-4931-527-40
Figure 4. First carrier null of carrier frequency.
(7) Note multimeter dc V indication.
(8) Set function 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
for a display as shown in figure 4.
(11) Adjust function generator output level until multimeter indicates value noted in
(7) above. Note function generator output level dBm setting.
(12) Readjust function generator output level for a carrier null on spectrum analyzer,
change will be less than 0.04 dBm of output level noted in (11) above.
b. Adjustments. No adjustments can be made.
11. Final Procedure
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.