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Old 31st May 2012, 06:51 PM   #41
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by AndrewT View Post
................Or, is it different connector types that account for the bandwidth differences?
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Originally Posted by macboy View Post
Go back and read carefully. RMJ1 explained that all TNC connectors
I have been reading and the second part of my original question is repeated here.

Is the 10GHz discrepancy due to using different connectors?
Or, is it due to the difference between 50ohm and 75ohm?

It appears from what is being said that the majority of the difference is due to using 75ohm cable in a 50ohm connector (only performs adequately to 1GHz) and using 50ohm cable in a 50ohm connector where both cable and connector are designed for maximum bandwidth.

If that had been made clear at the outset then I would not need to ask.
But this was posted.
Quote:
50 ohms are good to at least 11GHZ, 75 are only good to about 1 GHZ.
without stating that the 75ohm example was using the wrong impedance connector.

I know that correct termination is required. It never occurred to me that Rjm1 would use a 50ohm connector on a 75ohm cable and use that example of a mismatch to decry "all" 75ohm transmission, just for the sake of scoring a point against the use of 75ohms..
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Old 31st May 2012, 07:38 PM   #42
Pano is offline Pano  United States
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Get a good BNC-BNC cable with Canare or Belden cable and connectors. It will work great. I use them day in, day out for high bandwidth video and digital audio. They work great. When they don't, you see it right away.
See Markertek or Blue Jeans Cable. Get two, while you're at it, a longer one might come in handy some day.
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Old 31st May 2012, 09:38 PM   #43
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A little off-topic:
An interesting paper on high speed ADC's and jitter (math heavy).

http://electronicdesign.com/Portals/...YM_MID=1315505
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Old 1st June 2012, 05:43 AM   #44
AuroraB is offline AuroraB  Norway
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Andrew- as already said, the loss in bandwidth is due to the design of the 75 ohms connector to be intermatable with the 50 ohm version, by cheating in the the design of the dielectric insulation. A properly designed 75 ohms version would by any means be as good at the 50 ohms version, but they would not connect to each other.
See here - look at the TNC section...
HUBER+SUHNER - Connectors
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Old 1st June 2012, 10:13 AM   #45
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Thanks for the lead on Huber. Their distributer here is Richardson, who are one of our largest tube dealers. I have used them for many years. Regards
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Old 1st June 2012, 10:14 AM   #46
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BTW. love the signature.
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Old 1st June 2012, 12:08 PM   #47
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BNC should do just fine for this application like stated here before, I used BNC connections at my previous job (design / testing of TV RF front ends, roughly 40MHz - 1GHz), for testing TV's against Nordig, DTG, Digitenne specs and it never failed me. Also much more handy then using N or SMA type connectors...
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Old 1st June 2012, 12:10 PM   #48
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We do have the most interesting signatures on this forum! Regards
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Old 23rd November 2012, 01:04 AM   #49
freax is offline freax  Australia
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I've also came to the same conclusion as you guys, I'm moving most/all of my stuff over to BNC, because I've got a large amount of genuine RG6/Quad left over from my satellite tv days and I intend to use it!
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Old 23rd November 2012, 06:57 AM   #50
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I've also came to the same conclusion as you guys, I'm moving most/all of my stuff over to BNC, because I've got a large amount of genuine RG6/Quad left over from my satellite tv days and I intend to use it!
Do you have crimp tools or will you use some sort of screw on connectors?

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