TB 9-6625-152-24
31. Modulation Meter FM
a. Press TI [MEM] key and then recall memory 01.
b. Press TI [TX TEST] key then press [SELECT] key to select ANTENNA input.
c. Press TI [TX FREQ], 100 MHz keys.
NOTE
TI modulation meter should already be set to demodulate FM,
with 30 kHz I.F. filter and 0.3 to 3.4 kHz A.F. filter selected
from power on. If not, select them.
d. Connect measuring receiver to signal generator output.
e. Set signal generator for a 100 MHz, 0 dBm signal, with 25 kHz FM at a 1 kHz
modulation rate.
f. Configure measuring receiver for FM deviation measurement. Record measuring
receiver indication.
g. Set signal generator output to off and disconnect measuring receiver.
Connect
signal generator output to TI ANTENNA input.
h. Set signal generator output to on. Adjust R181 (fig. 11) so TI modulation meter
indication is equal to that recorded in f. above.
i. Perform paragraphs 15 a, 16 a, 17 a, 18 a, 19 a, 20 a and 21 a above.
32. Final Procedure
a. Deenergize and disconnect all equipment.
b. Replace all covers and annotate and affix DA label/form in accordance with
TB 750-25.
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