TB 9-6625-2171-35
(2)
Press and hold LOC 90 Hz pushbutton. If measuring receiver does not
indicate an amplitude modulation between 18 and 22 percent, perform b below. Release
LOC 90 Hz pushbutton.
(3)
Press and hold LOC 150 Hz pushbutton. If measuring receiver does not
indicate an amplitude modulation between 18 and 22 percent, perform b below. Release
LOC 150 Hz pushbutton.
(4)
Set LOC 1020 Hz switch to ON and press and hold both 90 Hz and 150 Hz
pushbuttons. Measuring receiver will indicate an amplitude modulation between 5 and 15
percent. Release 90 Hz and 150 Hz pushbuttons.
(5)
Connect audio analyzer to measuring receiver modulation output.
(6)
Press and hold both LOC 90 Hz and 150 Hz pushbuttons. Measure
distortion. Audio analyzer will indicate less than 10 percent. Release LOC 90 Hz and 150
Hz pushbuttons.
(7)
Set LOC 1020 Hz switch to OFF.
(8)
Press and hold LOC 90 Hz pushbutton. Measure distortion. Audio analyzer
will indicate less than 5 percent. Release LOC 90 Hz pushbutton.
(9)
Press and hold LOC 150 Hz pushbutton. Measure distortion. Audio
analyzer will indicate less than 5 percent. Release LOC 150 Hz pushbutton.
(10)
Disconnect audio analyzer from equipment setup and connect frequency
counter to MODULATION OUTPUT.
(11)
Press and hold LOC 150 Hz pushbutton. Frequency counter will indicate
between 89.91 and 90.09 Hz. Release LOC 150 Hz pushbutton.
(12)
Press and hold LOC 90 Hz pushbutton. Frequency counter will indicate
between 149.85 and 150.15 Hz. Release LOC 90 Hz pushbutton.
(13)
Set LOC 1020 Hz switch to ON.
(14)
Press and hold both LOC 90 Hz and 150 Hz pushbuttons. Frequency
counter will indicate between 994.5 and 1045.5 Hz. Release both LOC 90 Hz and 150 Hz
pushbuttons.
Set LOC 1020 Hz switch to OFF.
(15)
Repeat a(2) and (3) above for best compromise of adjustment (R).
a. Performance Check
(1)
Set LOC PWR switch to OFF and GLIDE SLOPE PWR switch to ON. If
VAR light is illuminated, press light to extinguish.
