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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Fri Jul 16, 2010 6:24 pm Post subject: anyone ever tried shielding the cables coming from the vim |
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like in the topic, has anyone ever tried this.
when looking into the tube faces the most noise is noticeable in the red, does this have anything to do with the red cable having to travel more to get to the vnb?
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Fri Jul 16, 2010 8:15 pm Post subject: |
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Hello
All the VIM cables are the same length. Try isolating the red cable from any G2 lines held in the little clips; G2 is 500+ volts and could inject noise into the VIM cables.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Sat Jul 17, 2010 4:16 pm Post subject: |
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the tested and proven method is to replace the VIM cables with high quality Belden mini-coax. Bear in mind the Belden mini is still twice as thick as the original cables.
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Sat Jul 17, 2010 4:31 pm Post subject: |
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if anyone has the little connectors and the cable i would like to buy from them.
the little connectors arent available in europe, and any high grade coax will do i guess.
is the cable used in the marquee 50 or 75ohm impedance.
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1 answer always poses multiple questions.
marquee 9500ultra HD10L moome hdmi1.3 v3+ some mods.
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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CZ Eddie
Joined: 23 Mar 2006
Posts: 1601
Location: Austin, TX
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| Posted: Sat Jul 17, 2010 5:06 pm Post subject: |
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| dvh99 wrote: | http://www.techtoolsupply.com/ProductDetails.asp?ProductCode=FSRCA15RGB
i mailed them and asked for the measurements if the pin diameter is 1.7mm i will order a bunch. |
Might be too deep, would you be able to get the neckboard cover on with that in place?
Somewhere on this forum or AVS, is a link to the correct mini connectors. I checked my files but it looks like that was some of the info I lost on a hard drive crash a few years ago.
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CZ Eddie
Joined: 23 Mar 2006
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Location: Austin, TX
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Sat Jul 17, 2010 5:52 pm Post subject: |
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i know of the connect tech connectors but they look flimsy.
getting them on the vnb isnt a problem i will drill a hole in the cover plate but getting them on the vim and sliding the vim back in without damaging something might be more difficult.
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marquee 9500ultra HD10L moome hdmi1.3 v3+ some mods.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Sat Jul 17, 2010 7:20 pm Post subject: |
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ah i see, maybe techtoolsupply can get their hands on better 1s then the 1s from connecttech.
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marquee 9500ultra HD10L moome hdmi1.3 v3+ some mods.
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Sat Jul 17, 2010 11:44 pm Post subject: |
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| dvh99 wrote: | http://www.techtoolsupply.com/ProductDetails.asp?ProductCode=FSRCA15RGB
i mailed them and asked for the measurements if the pin diameter is 1.7mm i will order a bunch. |
The connectors on the Marquee are mini RCA not the standard RCA connector. Very hard to find. The ultimate cable option is in thread:
https://www.curtpalme.com/forum_archived/viewtopic.php@t=19289.html
In any case remember to keep the three cable lengths the same.
Scott
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Sun Jul 18, 2010 1:47 am Post subject: |
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wow those look really nice, thanks scott.
they dont look so flimsy as the connecttech mini rca connectors.
how will i be able to get the smb connector on the vnb with the heatsink installed?
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Sun Jul 18, 2010 12:58 pm Post subject: |
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something like this its a 50 ohm cable?
TYCO ELECTRONICS / GREENPAR - 1337817-2 - LEAD, RG174 SMB R/A PLG-PLG, 0.5M
http://www.farnell.com/datasheets/515310.pdf
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Sun Jul 18, 2010 4:26 pm Post subject: |
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The SMB cables are available in 50 and 75 ohm versions. I'm not sure what the impedance of the Marquee cable is. The red and green VIM outputs are back terminated with 24 ohm resistors so neither 50 or 75 ohm cable is exactly right. The blue VIM output is back terminated with 75 ohms and the neck cards are input terminated with 75 ohms so 75 ohm cable would be correct there.
A couple of screws and a few nuts loosened and removed and the neck card heatsink will come right off. Be careful with the transistor nuts. Too much torque can break the four little leads.
Scott
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Sun Jul 18, 2010 10:27 pm Post subject: |
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hi scott i have been looking for the connectors for the vim and vnb like in the pictures but all the models i find are with 4 legs instead of 2, where did you find them?
once i have a source where i can buy the plugs connectors and appropriate cable 75ohm with the lowest damping factor i will buy enough for at least 4 pjs.
if anyone is interested maybe we can share costs when buying in bulk.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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donaldk
Joined: 17 Jun 2008
Posts: 308
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| Posted: Mon Jul 19, 2010 2:23 am Post subject: |
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| draganm wrote: | | the tested and proven method is to replace the VIM cables with high quality Belden mini-coax. Bear in mind the Belden mini is still twice as thick as the original cables. |
Pope coax was used in early (analog chassis) Barco's. Pope (originally an Philips business) in Venlo was bought out by Belden, wich now has its Euro HQ in Venlo.
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