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Author Topic: Diode stuffing for Nonsynce 4:2:4 decoding on cp55 Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 06-08-2010 07:48 PM                     Does anyone have the diode stuffing handy to set the cp55 nonsync input to 4:2:4 matrix decoding with sub The units have been stuffed for the DA20 method of SR and there is a signal appearing on the output LED of the cat 150 but the output card only shows the hard left and right I can't seem to find the schematic or notes for the cat 243  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 06-09-2010 06:06 AM                     The CP55 ONLY routes L/R to L/R...not 2:4 decoding except for Center and Surround. Steve  |  IP: Logged Tony Bandiera Jr Film God Posts: 3067 From: Moreland Idaho Registered: Apr 2004 posted 06-09-2010 03:14 PM                     Isn't there some sort of backplane mod to get 2:4 decoding? Maybe switching the N/S in where the SRA-5 would normally go? I'm sure Sam would know of a way to do it.  |  IP: Logged Pete Naples Phenomenal Film Handler Posts: 1565 From: Dunfermline, Scotland Registered: Feb 2001 posted 06-09-2010 04:07 PM                     It's been a few years, but I've gotten round this succesfully. With a SRA5 installed the good (DA20) way, I connect my pro-logic souce to the SRA5 Non-Sync terminals, then with a simple toggle switch and a bit of wiring, you put the DA20 into 'SR OUT', by breaking the sens/control line between the SRA5 and the CP55. With the CP55 in Format 05, the SRA5 routes it's Non-Sync input straight into the decoder. Watch out for DC or spikes on the SRA5 Non-Sync output. The VCA doesn't like that, and those chips are getting rare now. A colleague came up with a resistive scheme to protect it from such things, I don't have the details handy, sorry.  |  IP: Logged

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