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HDMI Signal drops

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Luke Geis:
If the switch isn't the commonality, then we move onto the next possibility. Typically if it is a quick blip, it is a sync issue. HDMI cables and long length don't work well together. So try a new shorter cable between the computer and switch or between the computer and the DA for the projectors. Syncs can be lost because one or more units are not in the working range of the signal I.E. 1080p vs 1080i, or scaling from 1920x1080 or some other pixel count that isn't the same as what it is trying to scale down or up to. Often times I find using a Decimator helps with that. Most devices, especially ones connected via HDMI, all like to play in the same size and format unless you have another device like a Decimator that converts and scales the image for the next device in line.

My experience is that ALL the types of switchers like what you have are just not reliable for mission-critical stuff. You have to step up to something meant for show level work by companies like Analog Way, Black Magic Designs or similar. Analog Way has older units like the Pulse II that you can find used which may work for you? A bit more affordable are the Black Magic Design Atem units which are pretty common. Having a Decimator or two is always a treat to have as well. These units are more show level and of course have a cost associated with it, but if you want seamless uninterupted video, its the only way to go.

Erik Jerde:

--- Quote from: Luke Geis on March 16, 2020, 05:42:34 PM ---If the switch isn't the commonality, then we move onto the next possibility. Typically if it is a quick blip, it is a sync issue. HDMI cables and long length don't work well together. So try a new shorter cable between the computer and switch or between the computer and the DA for the projectors. Syncs can be lost because one or more units are not in the working range of the signal I.E. 1080p vs 1080i, or scaling from 1920x1080 or some other pixel count that isn't the same as what it is trying to scale down or up to. Often times I find using a Decimator helps with that. Most devices, especially ones connected via HDMI, all like to play in the same size and format unless you have another device like a Decimator that converts and scales the image for the next device in line.

My experience is that ALL the types of switchers like what you have are just not reliable for mission-critical stuff. You have to step up to something meant for show level work by companies like Analog Way, Black Magic Designs or similar. Analog Way has older units like the Pulse II that you can find used which may work for you? A bit more affordable are the Black Magic Design Atem units which are pretty common. Having a Decimator or two is always a treat to have as well. These units are more show level and of course have a cost associated with it, but if you want seamless uninterupted video, its the only way to go.

--- End quote ---

What Luke said.

Caleb Dueck:

--- Quote from: Luke Geis on March 16, 2020, 05:42:34 PM ---If the switch isn't the commonality, then we move onto the next possibility. Typically if it is a quick blip, it is a sync issue. HDMI cables and long length don't work well together. So try a new shorter cable between the computer and switch or between the computer and the DA for the projectors. Syncs can be lost because one or more units are not in the working range of the signal I.E. 1080p vs 1080i, or scaling from 1920x1080 or some other pixel count that isn't the same as what it is trying to scale down or up to. Often times I find using a Decimator helps with that. Most devices, especially ones connected via HDMI, all like to play in the same size and format unless you have another device like a Decimator that converts and scales the image for the next device in line.

My experience is that ALL the types of switchers like what you have are just not reliable for mission-critical stuff. You have to step up to something meant for show level work by companies like Analog Way, Black Magic Designs or similar. Analog Way has older units like the Pulse II that you can find used which may work for you? A bit more affordable are the Black Magic Design Atem units which are pretty common. Having a Decimator or two is always a treat to have as well. These units are more show level and of course have a cost associated with it, but if you want seamless uninterupted video, its the only way to go.

--- End quote ---

Another vote for what Luke said. 

Cheap quality gear is cheap for a reason.  I've seen too many Black Magic failures to not have backups on hand, they are the Behringer of video. 

Roland, Ross, For.A, Panasonic all make good switchers.  Decimator makes great misc converters and adapters.  Extron and some others make good HDbaseT extenders. 

It sounds like you're pushing a distance limit.  A Decimator or one of the many HDMI "toolbox" devices is invaluable for troubleshooting.  Sometimes one projector losing sync due to distance will throw off the whole switcher, depending on switcher quality, making one small issue seem like a global issue. 

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