Tektronix 1L30 Instruction Manual page 80

Fig. 6-24. Typical display showing identical frequency modulation.
Measure the horizontal displacement of the signal at the most verti­
cal slope of the signal.
g. Change the DISPERSION to 100 kHz/cm.
IF feedthrough signal off screen by tuning the IF CENTER
FREQ control. Adjust the RF CENTER FREQ control to center
a converted or tunable signal display on screen. Adjust the
MIXER PEAKING for maximum signal amplitude.
h. Switch the INT 1 MHz REF FREQ to the INT position
and phase lock the display.
i. Decrease the DISPERSION to 1 kHz/cm, keeping the
phase-locked signal on screen with the IF CENTER FREQ
controls.
j. Check the amount of frequency modulation in the con-
verted signal (IF + LO) display. Must not exceed 3 mm or
1.5 minor divisions (300 Hz).
k. Return the DISPERSION-COUPLED RESOLUTION con-
trols to 500 kHz/cm.
Mark Generator.
NOTES
C alib ratio n — Type H 3 0
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