Olson Technology OTM-3550 - Manual (Page 5)

025-000136 REV J Page 5
F.C.C. OFFSET FREQUENCIES (Continued)
4) VIDEO MODULATION ADJUSTMENT
A) Connect a video source of approximately 1V p-p to the video input connector (75 ohms input Z)
on the rear panel. The video should be of a reasonably bright scene (commercials are usually
excellent).
B) The video overmodulation indicator LED may stay on for approximately one minute after the
unit is first turned on. Wait for approximately one minute before adjusting the video modulation
control and observing the LED.
Rotate the video modulation level adjust control slowly clockwise until the video overmodulation
LED just turns on. CAUTION: If the modulation is set too high, compression or lack of
contrast will occur during high intensity scenes.
5) AUDIO MODULATION ADJUSTMENT
A) Connect an audio source of 500mV p-p (minimum) to the balanced audio input connector (600
ohms input Z) on the rear panel. The source should be typical of the program material to be
carried.
B) Rotate the audio modulation level adjust control slowly clockwise until the audio
overmodulation LED just begins to blink. CAUTION: Overmodulation can result in severe
distortion in some TV sets. Set this control at peak program levels.