oinkaudio Posted September 2, 2015 Report Share Posted September 2, 2015 Hi there, Interesting situation. I teach at a tertiary institution and we are utilizing the Sound Device 744T's and the Arri Alexa's. But whenever we jam sync to the Arri using the 744T as the slave at 24fps on free run via a 5 pin lemo cable, it take quite a few attempts to get the sync to be perfect. Then after around 20 minutes, the TC is out by at least 2 seconds which I find very strange. I have worked with the 788T and the Arri and never had this problem before- normally I re-jam after 4-5 hours but never after 20 minutes. Can someone possible explain why this is happening- ie What is the set up on the Arri and the 744T (maybe I am missing something) because this is a verty strange problem. Thanks. Quote Link to comment Share on other sites More sharing options...
John Blankenship Posted September 2, 2015 Report Share Posted September 2, 2015 What are your settings on both systems? Quote Link to comment Share on other sites More sharing options...
ayushahuja Posted September 2, 2015 Report Share Posted September 2, 2015 Check Sensor FPS and Project FPS? - Press the info button and choose Fps to view all the set rates. Its usually the first thing i check Ayush Quote Link to comment Share on other sites More sharing options...
JonG Posted September 2, 2015 Report Share Posted September 2, 2015 I'd venture to guess that the settings are off, and I would also guess that 24fps is not entirely correct. However, like previously mentioned, without a full list of details regarding both devices, it would be hard to say. I have never had a problem with Alexas, I find them to be among the easiest cameras to work with, but if your frame rate is off then it will give you problems, like any device. I dont know what you typically shoot at where you are located, but I would think it would not be 24fps, so that might be your issue. Remember, a lot of camera documentation will say 24 but mean 23.976. I dont think this is the case with Arrie, but double check to be sure. Quote Link to comment Share on other sites More sharing options...
mikewest Posted September 2, 2015 Report Share Posted September 2, 2015 Yep check that t/code settings on each device are the same Also when you have jammed the Alexa with Ext TC remember to set the camera back to Int TC mike Quote Link to comment Share on other sites More sharing options...
BVS Posted September 2, 2015 Report Share Posted September 2, 2015 Matt Price did this a couple of years ago which helps....https://www.youtube.com/watch?v=OQASROL6SjU Quote Link to comment Share on other sites More sharing options...
RPSharman Posted September 3, 2015 Report Share Posted September 3, 2015 Yep check that t/code settings on each device are the same Also when you have jammed the Alexa with Ext TC remember to set the camera back to Int TC mike You don't have to do this. I never have. The manual reads as such. You certainly can do it, as many people seem to, but I contend that any menu change regarding TC after the TC has been jammed runs the risk of affecting the system. The OP is a bit confusing. I read it that he is jamming the 744T from the Alexa. It is common practice to do it the other way around. I think people here are correct in that the settings are off. If not, one or the other of the machines is broken. Quote Link to comment Share on other sites More sharing options...
mikewest Posted September 3, 2015 Report Share Posted September 3, 2015 It's always worked for me Ray mike Quote Link to comment Share on other sites More sharing options...
pkautzsch Posted September 4, 2015 Report Share Posted September 4, 2015 +1 to Settings Are Off. And +1 to Sound Is TC Master, supplying TC to camera. Typical things to look for with Alexas are: Sensor Frame Rate vs. Project Frame Rate, Record Run vs. Free Run, Framerate Changes (like slo-mo) - and with the 744T I have heard reports of a crosstalk issue between the TC in and TC out leads with certain cables so when playing back a take it jams itself to the wrong (played back) code. Does the offset happen with restarting either camera or 744T? Then it might be a bad TC battery. Normally both units hold TC very well for more than the alleged/warranted 10 minutes. When an Alexa says 24 fps, it's real 24 fps. And normally it holds TC very well even for a whole shooting day - though most folks here like to re-jam after lunch.+1 to Settings Are Off. And +1 to Sound Is TC Master, supplying TC to camera. Typical things to look for with Alexas are: Sensor Frame Rate vs. Project Frame Rate, Record Run vs. Free Run, Framerate Changes (like slo-mo) - and with the 744T I have heard reports of a crosstalk issue between the TC in and TC out leads with certain cables so when playing back a take it jams itself to the wrong (played back) code. Does the offset happen with restarting either camera or 744T? Then it might be a bad TC battery. Normally both units hold TC very well for more than the alleged/warranted 10 minutes. When an Alexa says 24 fps, it's real 24 fps. And normally it holds TC very well even for a whole shooting day - though most folks here like to re-jam after lunch. Quote Link to comment Share on other sites More sharing options...
Constantin Posted September 4, 2015 Report Share Posted September 4, 2015 with the 744T I have heard reports of a crosstalk issue between the TC in and TC out leads with certain cables so when playing back a take it jams itself to the wrong (played back) code. that could only happen if the settings on the 744T were off. It will not just jam to incoming TC. Quote Link to comment Share on other sites More sharing options...
pkautzsch Posted September 4, 2015 Report Share Posted September 4, 2015 (The 744T) will not just jam to incoming TC. Except if, like the OP possibly did since they jam it *from* the Alexa, one sets it to do so. Quote Link to comment Share on other sites More sharing options...
Constantin Posted September 4, 2015 Report Share Posted September 4, 2015 Except if, like the OP possibly did since they jam it *from* the Alexa, one sets it to do so. like I said, when the settings are off 😉 Quote Link to comment Share on other sites More sharing options...
pkautzsch Posted September 9, 2015 Report Share Posted September 9, 2015 hehe... Quote Link to comment Share on other sites More sharing options...
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