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Old 28th Aug 2022, 5:52 pm   #105
FERNSEH
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Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Modeline experiments

How does the device work? It's understood that the single frame sync pulse generated by the computer is replaced by a chain of eight 2H 40microsecond pulses.
Certain receivers such as properly designed models like the Murphy V310, V410 etc will only work with broadcast quality sync pulse chains. The eight 40microsecond frame pulses are integrated by a critical CR time constant circuit.
The Bush TV22. Recall the subject of too much integration in the frame sync circuit was discovered be Dr Hugo Holden? The simple matter of replacing a 100K resistor in the frame sync separator circuit with one of 10K improved interlace considerably.

DFWB.
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