TB 9-6625-2171-35
(2)
(3)
Press and hold GLIDE SLOPE 150 Hz pushbutton. Record digital
(4)
Set UP-OC-DOWN switch to UP. Record digital multimeter indication.
(5)
Set UP-OC-DOWN switch to DOWN. Record digital multimeter indication.
(6)
Release GLIDE SLOPE 150 Hz pushbutton and press and hold GLIDE
SLOPE 90 Hz pushbutton. Record digital multimeter indication.
(7)
Set UP-OC-DOWN switch to OC. Record digital multimeter indication.
(8)
Set UP-OC-DOWN switch to UP. Record digital 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)
Connect audio analyzer to measuring receiver modulation output.
(5)
Press and hold GLIDE SLOPE 90 Hz pushbutton. Measure distortion.
Audio analyzer will indicate less than 5 percent. Release GLIDE SLOPE 90 Hz
pushbutton.
(6)
Press and hold GLIDE SLOPE 150 Hz pushbutton. Measure distortion.
Audio analyzer 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).