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Help! Can someone test this for me?
If anyone is working in PAL and has a broadcast monitor with both Component and Composite could you do a comparison between the 2 outputs for me?
When I do it on my system I see a large amount of clipping in the top end on the COMPOSITE output. This doesn’t occur on the component or SDI ouptputs.
I have no way of knowing if it’s my setup or my AJA IO which is the problem without someone else doing the test as well.
Many thanks for any help
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5 Replies
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hi james,
seems to be fine on my setup. Do you have everything terminated, or actually terminated when it shouldn’t be?nick
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nothing extraordinary happening on mine with clipping. V5.0.2 FCP on Tiger. V2 firmware on AJA io
Is there anything more specific to check..?
Hope this helps…
Darren Mostyn, Brighton. -
Hi Nick,
When should termination be necessary? Does it apply to all sources of video (composite, component, SDI)? Are some monitors capabale of termination internally? I’ve never needed to do it before and they only mention I can find in the manual is to terminate the ref signal.
Sorry for all the questions, it’s an unknown area for me.
Cheers
James
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James,
Termination is definitely necessary with analogue (component and composite), not sure about SDi, but i dont tihnk so. Some monitors do have internal termination, but generally if they do it will be a switch you can turn off/on, usually saying something like 80ohm on/off. etc….. It actually says in the manual for my JVC1750 that if the output cable isnt connected the signal is automatically terminated, but i dont believe it as when you diconnect the lead, the luminance of the input signal jumps noticeably.On other monitors that have a switch for internal termination, when both input and output leads are connected, AND the termination switch is on, the signal luminance drops! I would try a little BNC terminator to test, they arent particulalry expensive. Try cpc.co.uk.
Ref signals also need to be terminated, as they are essentially a composite signal.
cheers
NIck -
That is kind of what I thought with regards to termination. But the only confusing issue is that if I take an SDI signal from the AJA in to a Digi-Beta and then take a composite signal out of the Digi to the same monitor I see no problem with the image.
Therefore the composite signal from the AJA is different than from the Digi. I’ve tried all firmwares and drivers with no improvement.
I can only conclude that my AJA is malfunctioning.
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