................Or, is it different connector types that account for the bandwidth differences?
I have been reading and the second part of my original question is repeated here.Go back and read carefully. RMJ1 explained that all TNC connectors
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.
without stating that the 75ohm example was using the wrong impedance connector.50 ohms are good to at least 11GHZ, 75 are only good to about 1 GHZ.
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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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.
See Markertek or Blue Jeans Cable. Get two, while you're at it, a longer one might come in handy some day.
A little off-topic:
An interesting paper on high speed ADC's and jitter (math heavy).
http://electronicdesign.com/Portals...D-04_922&YM_RID=grafkc@cox.net&YM_MID=1315505
An interesting paper on high speed ADC's and jitter (math heavy).
http://electronicdesign.com/Portals...D-04_922&YM_RID=grafkc@cox.net&YM_MID=1315505
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
See here - look at the TNC section...
HUBER+SUHNER - Connectors
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...
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?
G²
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