I've used video DA's for AES using 75 ohm Canare transformers. Larrchild wrote on Mon, 24 April 2006 15:25 I don't have the HD-24's but had the blackface ADAT's in the early 90's and if I don't remember having any trouble syncing 3 together with only the 9 pin sync. There really isn't a need for it when only linking two digital devices together and the HD's are made to sync if I remember correctly up to 8 in line with just the ADAT Sync cables in between them. ![]() Anytime I can leave an outboard clock out of the equation the better I like it. I don't think that it's a big issue of clocking to BNC or just using the optical "if cable runs are kept to a minimum length". Also, I link Fostex HD-R's together, they have BNC In and Out with a termination on or off switch on all units, I've tested clocking over the BNC with clocking over 1 meter optical cables and I can hear no difference, when the optical cables are short. If he syncs the second HD to the first one via ADAT Sync, he won't need outboard clock. If something messes up on the master, such as a pop, click, glitch or whatever, the safety track could be used to replace that track with little problem as they will be on the same timeline and same frame rate. In this way he'll have stable clock and the safety tracks will be on the same timeline as the main tracks. They only have BNC word IN, not out but the 9 pin will sync the transports and the sample rate clock on the master HD to the slave HD. You can buy the cable at Wal-mart for about 8 bucks. If I were using two HD-24's, I'd link them with the ADAT Sync d-sub 9 pin.
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