Teardown of some expensive video broadcast gear - Page 1
Forum section: electronics / general

author: ion
author_rank: Regular Contributor
timestamp: May 08, 2015, 09:47:53 am
content: Seems like the link is wrong:Great video! I am curious though, why are there multiple turns of fibre optic cable on some of those boards? Looks like too many if it was just strain relief.Is it something to do with a minimum length for timing purposes?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: May 08, 2015, 12:23:57 pm
content: Quote from: ion on May 08, 2015, 09:47:53 amForum sotware seems to be mangling itGreat video! I am curious though, why are there multiple turns of fibre optic cable on some of those boards? Looks like too many if it was just strain relief.Is it something to do with a minimum length for timing purposes?Don't think so - I'm not very familiar with fibre stuff - could just be the length they come with.Maybe the fibre stuff comes pre-terminated.

author: Alex
author_rank: Regular Contributor
timestamp: May 08, 2015, 12:53:39 pm
content: Quote from: mikeselectricstuff on May 08, 2015, 12:23:57 pmThis is indeed the case.A

author: free_electron
author_rank: Super Contributor
timestamp: May 08, 2015, 03:18:20 pm
content: the C-Cube chip is a realtime DV codec. HDV format was the first digital format handling 1920x1080 on 8mm tape.the C-cube chip can read the stream and split it in multiplexed RGB or YUV 8 bit data paths fdor processing.It can also realtime re-encode the stream.I had a Pinnacle DVRT card years ago. basically a video editing card for Adobe Premiere. that had the C-Cube chip on it.Software encoders needed rendering time to create the output file. with the C-cCube chip . simply hit 'play' and the computer barely needed doing anything at all.

author: djQUAN
author_rank: Frequent Contributor
timestamp: May 08, 2015, 04:14:34 pm
content: I believe the SMPS does indeed use magnetic amplifier regulation. The red toroids look remarkably similar to the tape wound cores I have in the junk bin that are used for mag amps. (see attachment)

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: May 08, 2015, 08:18:10 pm
content: Yes - I can't think why else you'd have big coils like that near the secondary

author: majbthrd
author_rank: Contributor
timestamp: May 09, 2015, 02:33:22 am
content: I was in a related industry during the same time frame; the teardown brought back memories.I also used those PLCC socket AMD CPLDs. I remember once shipping off a prototype to a trade show. Some sales droid in the booth was apparently persuaded by one of the trade show attendees to remove the cover. The attendee saw the large chip with AMD logo and subsequently started authoritatively writing to the world that the device was PC-powered with an AMD x86 processor.

author: bson
author_rank: Unknown
timestamp: May 10, 2015, 07:05:13 am
content: Is it me or are they using really thick PCBs for the rear panel? With the silkscreen providing the print!

author: SeanB
author_rank: Super Contributor
timestamp: May 10, 2015, 07:45:31 am
content: They need something thick so they get a good RF ground with the wrapped around finger shielding.silkscreen for the writing and the coloured soldermask for insulation and protection of the ENIG coating they also used on the board. Even the blank boards they used for mechanical support have some copper on them.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: May 10, 2015, 09:02:45 am
content: Quote from: bson on May 10, 2015, 07:05:13 amYes - I think it was 2.4mm