TB 9-4931-488-24
(7) Proceed to technique (12) below.
(8) Position controls as listed in (a) through (e) below:
(a) AM X10% pushbutton pressed.
(b) AM switch to OFF.
(c) MODULATION FREQUENCY range switch to 1000 Hz.
(d) AM control fully ccw.
(e) RANGE MHZ switch to 256 - 128.
(9) Connect multimeter INPUT HI to A2TP3 (DC OUTPUT, fig. 1) and INPUT LO
multimeter indication.
(10) Disconnect multimeter INPUT HI from DC OUTPUT A2TP3 and connect
0.000 1 mV dc multimeter indication.
(11) Disconnect multimeter INPUT HI from A2TP4 (METER ADJ, fig. 1) and
connect to A26A2TP1 (AM IN, fig. 2).
(12) Set AM switch to INT and adjust AM control for a multimeter indication of
0.707 V ac. Adjust A2R28 (METER DRIVE, fig. 1) for a TI meter indication of 10 on 0 to 10 scale.
(13) Position controls as listed in (a) through (g) below:
(a) LEVEL VOLTS pushbutton pressed.
(b) AM switch to INT.
(c) AM control fully ccw.
(d) RANGE MHz switch to 256 - 128.
(e) FREQUENCY TUNE control for FREQUENCY MHz display indication of 190 MHz.
(f) OUTPUT LEVEL vernier control to CAL.
(g) OUTPUT LEVEL switches to +10 dBm.
(14) Disconnect multimeter from TI. Connect RF OUT to measuring receiver input
and set RF OFF/ON switch to ON.
(15) Set measuring receiver to measure AM depth with RMS detector.
(16) Adjust AM control for a measuring receiver indication of approximately 20%.
Press measuring receiver AMPLITUDE Y-Scale. Set Display Mode to Ratio and Ratio Mode
to Linear.
(17) Set OUTPUT LEVEL switches to 0 dBm. Adjust A26A1R19 (DET, fig. 3) for a
measuring receiver indication of 100%.
(18) Set OUTPUT LEVEL switches to +10 dBm. If measuring receiver does not
indicate between 99.5 and 100.5%, repeat technique of (9) and (10) above while adjusting
A26A1R19 (fig. 1) for best in-tolerance condition.
(19) Set measuring receiver to measure RF power.
(20) Position controls as listed in (a) through (d) below.
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