x
Exsultavit 22 April 2006

Folks-

I'm currently using my workhorse Apogee PSX-100 as a master clock for my Alesis HD24- using the BNC clock out of the Apogee and feeding the 'word' in on the HD, effectively removing the HD24s internal clock and replacing it with the Apogee's.

In an upcoming project, I'll be using two HD24s- NOT as a 48 track 'synced' unit, but as seperate machines- with one running as a safety. I'd like both units to clock to the Apogee, though.

The thing is this: The Apogee only has one BNC 'word' output. Is there a splitter of some kind that will allow me to use the single BNC out of the Apogee as master for both units?

Thanks!

Comments

Zilla Sat, 04/22/2006 - 15:19

W/C output circuits are designed to transmit their signal into a 75ohm impedance. This means that both the cable and the termination in the receiving device's input should be 75 ohms.

If you take your apogee's w/c out and strap it across two w/c inputs, the parallel impedance will be only 37.5ohms. This may cause interfering reflections or sag in the square wave clock signal creating dubious timing quality. And the more devices you mult, the further off the impedance will be.

The correct way to mult w/c with BNC "T" connectors is when the inputs can be made unterminated, and you use a 75ohm BNC terminator only at the last device in the chain, like this....

WC OUT>-------T------T------T-[BNC 75term]

Plenty of people have mult'd their w/c without observing proper termination, and everything still functioned. But the performance will most likely not have been as good as it could have.

x

User login