Quote:
Originally Posted by FERNSEH
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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Best idea David is to ask Peter Scott as he came up with the circuit.
The odd thing is the V310 gives perfect interlace with 4 pulses or 10 and even the pulse length can be different, remove them and the set goes haywire and you also get tearing on line! This is the only set I have that is uncomfortable with "no" broad pulses.
Have to say Peters circuit is rock steady and once set has no drift whatsoever.
I've added the photo of the setup here for you David if you haven't seen it already