TB 9-4931-488-35
(28) Set multimeter to measure dc voltage. Record multimeter dc indication as Vdc1.
(29) Set multimeter to measure ac voltage. Record multimeter dc indication as Vac1.
(30) Calculate the modulation output component (Modout) using the formula.
Modout = absolute value of (Vac1*1.414)/(Vdc1-Voff))*100
(31) Set multimeter to measure dc voltage.
(32) If Modout is not between 49.9 and 50.1 then record the multimeter indication as
dcv and repeat (23) through (31) above.
(33) Set A26A8S1 switch (fig. 2) to DC.
(34) Set multimeter to measure dc voltage, adjust the audio analyzer output for a TI
meter indication of 50%.
(35) Repeat technique of (22) through (25) above.
(36) Adjust A26A8R10 (fig. 2) for a multimeter indication of 0.50000 0.00005 Vrms.
(37) Repeat technique of (27) through (32) above.
(38) Disconnect multimeter from the measuring receiver and connect to the TI
DEMOD OUTPUT.
(39) Adjust A26A8R15 (fig. 2) for a multimeter indication of 1.414 0.001 Vdc.
(40) Set AM and RF OFF/ON switch to OFF.
a. Performance Check
(1) Press Instrument Preset on measuring receiver, then set to measure AM.
(2) Position TI controls as listed in (a) through (e) below.
(a) AM switch to OFF.
(b) AM control fully ccw.
(c) RANGE MHz switch to 128-64.
(d) FREQUENCY TUNE control for a 113 MHz indication on FREQUENCY
MHz display.
(e) OUTPUT LEVEL switches for a 0-dBm output.
(3) Connect equipment as shown in figure 7.
(4) Adjust audio analyzer amplitude and frequency controls for 1.0 V rms at 90 Hz
level.
(5) Set AM switch to DC and adjust AM control for TI meter indication of 50% AM.
(6) Set audio analyzer to measure AC level in dB mode, then press the audio
analyzer RATIO key.
(7) Set the audio analyzer output for a 150 Hz output then set to measure level.
