TB 9-6625-2171-24
(4) Set UP-OC-DOWN switch to UP. Record multimeter indication.
(5) Set UP-OC-DOWN switch to DOWN. Record multimeter indication.
(6) Release GLIDE SLOPE 150 Hz pushbutton and press and hold GLIDE SLOPE
90 Hz pushbutton. Record multimeter indication.
(7) Set UP-OC-DOWN switch to OC. Record multimeter indication.
(8) Set UP-OC-DOWN switch to UP. Record multimeter indication.
(9) Release GLIDE SLOPE 90 Hz pushbutton.
(10) Subtract value recorded in (7) above from value recorded in (3) above.
If
difference is not less than 2 mV, perform b below.
(11) Divide value recorded in (8) above by value recorded in (4) above. Ratio will be
between 1.46 and 1.66.
(12) Divide value recorded in (5) above by value recorded in (6) above. Ratio will be
between 1.46 and 1.66.
b. Adjustments. Adjust A6R37 (fig. 3) until value computed in a (10) above is less
than 2 mV (R).
22. Glide Slope Modulation
a. Performance Check
(1) Connect measuring receiver power sensor module to TI J3. Position measuring
receiver controls to measure AM. Set UP-OC-DOWN to OC.
(2) Press and hold GLIDE SLOPE 90 Hz pushbutton. If measuring receiver does
not indicate an amplitude modulation between 36 and 44 percent, perform b below.
Release LOC 90 Hz pushbutton.
(3) Press and hold GLIDE SLOPE 150 Hz pushbutton. If measuring receiver does
not indicate an amplitude modulation between 36 and 44 percent, perform b below.
Release LOC 150 Hz pushbutton.
(4) Press and hold GLIDE SLOPE 90 Hz pushbutton. Measure distortion.
Measuring receiver will indicate less than 5 percent. Release GLIDE SLOPE 90 Hz
pushbutton.
(5) Press and hold GLIDE SLOPE 150 Hz pushbutton. Measure distortion.
Measuring receiver will indicate less than 5 percent. Release GLIDE SLOPE 150 Hz
pushbutton.
b. Adjustments. Adjust A6R55 (fig. 3) for measuring receiver indication of 40 percent.
Repeat a (2) and (3) above for best compromise of adjustment (R).
23. MKR BCN
a. Performance Check
(1) Set GLIDE SLOPE PWR switch to OFF and MKR BCN PWR switch to ON.
(2) Connect measuring receiver power sensor module to TI J1. Position measuring
receiver controls to measure AM modulation rate.