Olson-technology DSK-300-S Manuel d'utilisateur télécharger pdf (Page 4)

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3.) F.C.C. OFFSET ADJUSTMENT

F.C.C. Offset frequencies are shown in Table 4. To adjust the frequency of a selected channel to provide

the correct F.C.C. offset, look up its offset frequency in Table 4. Remove the video input and connect a

counter to the RF output of the DSK-300-S. Use the front panel offset adjust control to set the output

frequency to the correct value.

4.) REAR PANEL

The rear panel of each module has its audio and video inputs and its RF output.

The audio and video inputs are RCA type phono jacks and the RF output is a type “F”.

5.) VIDEO MODULATION ADJUSTMENT (Each modulator).

DSK-300-S modulator modules are preset at the factory for 80% depth of modulation with a 1V P-P pulse

and bar test signal. If the video modulation needs to be adjusted, follow the procedure below.

Connect the video source (to be used at approximately 1V P-P) to the video input

phono jack. The video should be of a reasonably bright scene (commercials are

usually excellent).

Adjust the video modulation control on the front panel to obtain approximately 80% depth-of modulation as

measured on a spectrum analyzer or other test equipment capable of this measurement.

If the video modulation control needs to be set and there is no test equipment available, it can be set fairly

close by comparison. View a video signal on a properly adjusted television receiver or receiver/monitor.

Apply the same signal if possible, or one of equivalent brightness and contrast to the modulator that needs to

be set. View the output of this modulator on the same receiver and adjust the video modulation control for

brightness and contrast equivalent to the directly viewed picture. Use caution and do not set this control too

high.

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Olson-technology DSK-300-S Manuel d'utilisateur Page 4