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Old 22nd March 2005, 02:11 AM   #121
pooge is offline pooge  United States
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Hmm. Twelve pages of gossip and no mention of commercially available recommendations for TRUE 75 ohm BNCs. It was mentioned that some were sold as 75 ohm, but are not true 75 ohm. It's just that they mate to 75 ohm cable. The contruction between 75 and 50 is clear, but it's often hard to see in the brochures and catalogs to verify.

I'm looking for a true 75 ohm female panel mount. Any good commercially available recommendations?

Also, looking to use 75 ohm coax between jack and coax. Is solder connection to jack better than BNC female on the inside of the panel?
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Old 22nd March 2005, 02:21 AM   #122
gmarsh is offline gmarsh  Canada
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I just designed an AMP 413194-2 BNC connector into something.

Outer shell isn't gold, but the center pin is.
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Old 22nd March 2005, 03:57 AM   #123
pooge is offline pooge  United States
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Don't care about the gold. Just looking for proper impedance and good quality. Also, something easy to chassis punch. Don't have any double-D punches.
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Old 22nd March 2005, 04:03 AM   #124
Mikett is offline Mikett  Canada
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My old Assemblage DAC 2 sports a 75 ohm BNC, I think it's vampire.
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Old 22nd March 2005, 04:10 AM   #125
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Digi Key A24602 is 75 ohm chassis mount connector: http://dkc3.digikey.com/PDF/T051/0262.pdf
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Old 22nd March 2005, 09:01 AM   #126
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Howdy guys,

no one has mentioned, www.neutrik.com have a full range of 75 ohm and 110ohm products.


Jocko and Guido, did you measure standard xlr connectors or Neutrik's XCC 110ohm series?




Regards,
Mark
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Old 22nd March 2005, 10:45 AM   #127
pooge is offline pooge  United States
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Is anyone familiar with TRUE 75 ohm bulkhead jacks that are easy to mount in a chassis so they won't turn? The recessed ones look like they only need a round hole punched. I see in the Markertek catalog that they have Canare, Neutrik, and Switchcraft versions of these. I'd rather not go the recessed route, but would if it was the best solution. I know some of the bulkhead jacks need double-D holes, so they are out, since I don't intend to purchase such a punch for only a few jacks. Are there any bulkhead jacks that use a simple round hole that have a good arrangement to prevent the jack from turning in the hole? It's really hard to find some of these details, even from manufacture website data. If not, the recessed jacks look like the answer.
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Old 26th March 2005, 02:14 AM   #128
pooge is offline pooge  United States
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FWIW, Trompeter makes a gold flashed 75-ohm BNC with gold plated center pin in their video broadcast line, said to have the lowest return loss in the industry

http://www.trompeter.com/shop/downloadcat.asp
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Old 26th March 2005, 07:10 AM   #129
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Just get the Canare BNC heads from Markertek. They are true 75ohm and can do GHz. They are simply the best, gold plated or not. Many very high end DACs such as Zanden use them. You can also get the plastic washers which will improve the turning problem a little.

-finney
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Old 26th March 2005, 05:25 PM   #130
pooge is offline pooge  United States
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You are likely speaking of the jacks here. The Canares are certainly good enough for DAC use, since DACs use relatively low frequencies. I'm leaning to the recessed ones, because they use simpler round holes. But they take up a lot of room if trying to modify an already crowded panel.

As to plugs, the Trompeter look to be a better choice for HDTV frequencies and video cable use. These are also available at Markertek.
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