TB 9-6625-2079-24
(9) Adjust synthesized signal generator AM Depth setting for a TI MODULATION
display indication of 50%.
(10) Establish a ratio at the TI displayed value on the measure receiver and select
liner ratio function. If measuring receiver does not indicate between 98 and 102 percent,
perform b (2) and (3) below.
(11) Repeat technique of (9) and (10) above for TI display indications of 8 and
92 percent. Measuring receiver will indicate between 95 and 105 percent.
(12) Press LOW-PASS (kHz) 200 pushbutton.
(13) Repeat technique of (9) and (10) above for synthesized signal generator AM Rate
frequencies of .05, .1, 10, 15, 30, and 50 kHz.
b. Adjustments
(1) Adjust A11R32 (figure 2) for a TI display indication of 10.00 (R).
(2) Adjust measuring receiver controls to measure 100% AM modulation.
(3) Adjust A11R74 (figure 2) until TI display and measuring receiver display agree (R).
12. Audio Frequency Response, High-Pass, DE-EMPHASIS, Low-Pass, and 200
kHz Filters
a. Performance Check
(1) Remove measuring receiver and power splitter from setup and connect
synthesized signal generator RF Output to TI RF IN.
(2) Position TI controls as listed in (a) through (e) below:
LEVEL control to AUTO.
(a)
HIGH-PASS (Hz) pushbutton to 10.
(b)
LOW-PASS (kHz) pushbutton to 120.
(c)
FUNCTION pushbutton to kHz DEV.
(d)
RANGE pushbutton to 100.
(e)
(3) Position synthesized signal generator controls as listed in (a) through (e) below:
(a)
Frequency Control set to 100 MHz.
(b)
Level Control set to 0 dBm.
(c)
FM to On.
(d)
FM Rate set to 10 kHz.
(e)
FM Deviation set to 100 kHz.
(4) Adjust synthesized signal generator FM Deviation setting for 100 kHz Deviation
as indicated on TI display.
(5) Set synthesized signal generator FM Rate to 10 Hz. TI will indicate >70.7 kHz.
(6) Set synthesized signal generator FM Rate to 10 kHz.
(7) Press HIGH-PASS 30 pushbutton. If necessary, adjust synthesized signal
generator FM Deviation for a TI indication of 100 kHz.
(8) Set synthesized signal generator FM Rate to 30 Hz. TI will indicate between
66.3 and 74.7 kHz.