TB 9-6625-2079-24
(13) Repeat technique of (5) and (12) above for synthesized signal generator FM Rate
frequencies of 50, 100, 300, 10,000, and 100,000 Hz.
(14) Set synthesized signal generator frequency to 500 MHz, FM Rate to 10 kHz, FM
Deviation to 200 kHz, and set FM to off.
(15) Press RANGE 300 pushbutton.
(16) Repeat technique of (6) through (9).
(17) Repeat technique of (16) above for FM Deviation of 300 kHz.
b. Adjustments
(1) Repeat a (3) through (6) above.
(2) Set synthesized signal generator FM to on and adjust synthesized signal
generator controls for a 10-kHz FM Deviation indication on the measuring receiver.
(3) Adjust A10R8 (figure 2) for a TI indication of 10 kHz + (residual FM recorded in
a (6) above) (R).
11. Amplitude Modulation Accuracy and Frequency Response
a. Performance Check
(1) Connect equipment as shown in figure 3.
(2) Press TI pushbuttons as listed in (a) through (f) below:
HIGH-PASS (Hz) to 10.
(a)
LOW-PASS (kHz) to 15.
(b)
PEAK to PK-PK/2.
(c)
RANGE to 100.
(d)
FUNCTION to LEVEL.
(e)
LEVEL control to AUTO.
(f)
(3) Position synthesized signal generator controls as listed in (a) through (d) below:
(a)
Frequency Control set to 100 MHz.
(b)
Level Control set to 0 dBm.
(c)
AM to On.
(d)
AM Rate set to 1 kHz.
(4) Set measuring receiver to measure tuned RF level. Manually enter carrier
frequency.
(5) Adjust synthesized signal generator output for a 1 mW (0 dBm) indication on
measuring receiver.
(6) Set measuring receiver controls for AM modulation measurement and adjust
synthesized signal generator AM Depth setting for a 40 percent AM indication on
measuring receiver.
(7) If TI display does not indicate an RF level of between 9.99 and 10.01, perform
b (1) below.
(8) Press TI FUNCTION % AM pushbutton.