TB 9-6625-2094-35
(11) Connect measuring receiver MODULATION OUTPUT AUDIO INPUT to
audio analyzer INPUT HI.
a. Performance Check
(1) Set audio analyzer to measure distortion.
(2) Position controls as listed in (a) through (f) below:
(a) FREQUENCY switches to indicate 520.000 MHz.
(b) MODULATION MODE switch to AM.
(c) MODULATION FREQ switch to 1 KHz.
(d) MODULATION FM/AM slide control to 0 percent.
(e) OUTPUT step attenuator switch for 0 dBm.
(f) OUTPUT VERNIER control for -7 dB.
(4) Adjust TI MODULATION FM/AM slide control to indicate 70 percent AM on
measuring receiver.
(5) The audio analyzer will indicate less than 3 percent AM distortion.
(6) Adjust TI MODULATION FM/AM slide control to indicate 90 percent AM on
measuring receiver.
(7) The audio analyzer will indicate less than 5 percent AM distortion.
b. Adjustments. No adjustments can be made.
15. Frequency Modulation Accuracy
a. Performance Check
NOTE
Measuring receiver (FM) should be calibrated prior to running
this test.
(1) Connect measuring receiver sensor module to the TI RF OUTPUT.
(2) Set measuring receiver to measure FM.
(3) Press measuring receiver high-pass filter pushbutton to 50 Hz and low-pass
filter pushbutton to 15 kHz.
(4) Position controls as listed in (a) through (g) below:
(a) FREQUENCY VERNIER control to 0 kHz.
(b) FREQUENCY switches to indicate 050.000 MHz.