Hi all, long time reader first time poster.
I started working at a new facility a few months ago and have been upgrading/tweaking. Lately I've run into some video sync issues that have me a bit confused.
We have 7 FCP edit bays with Kona LHe HD/SD cards that I need to sync up with our master control switcher so I can cleanly switch between the edit bays and our cameras (in case our Dalet/Omneon stops working I can still feed a show out from an edit bay)
Signal flow is as follows:
Evertz 5600MSC (master clock)--->Evertz 5600ACO (Automatic Changeover)--->Evertz 5600ADA (analog distribution amp)--->
I then take one of the outputs of the distribution amplifier and feed that to the edit bays. I'm hooking them up in series (no sync loop-out on Kona cards), T'ing from my coax run to each edit bay (they are all in the same area)
The problem I'm having is that If I hook up more than 3 bays in series, I lose sync to all of them. I originally suspected a bad/shorted coax but they all test fine. Here is where it gets strange. If I hook up my coax tester downstream from the 3 edit bays I have currently hooked up, I get a short. If however, I test them individually, there is no short. Furthermore, If I hook up my tester directly to the output of the DA, It detects a partial short. If you refer to the pic below, PASS light is fully lit and short light glows dimly.
What is proper protocol to follow when running sync from one source to multiple destinations? Can using a combination of 1505a and 1694a coax be causing signal degradation?
This is really beginning to annoy me and there is little to no info online regarding the protocols of sync distribution.
Any advice will be much appreciated. I can offer further technical info if necessary. BTW, our facility is 1080i.
Thanks in advance!
