Hi, I want to know whether to use 50 or 75 ohm N connectors on some hardline.
First some background might be helpful.
As part of building our antenna system we are using some existing 3/4 inch
hardline that was previously used in a satellite system many years ago. I
assume this was a receiver system, but it is possible that it could have been
used for transmission too. We assumed this is 75 ohm cable, however using a
TDR shows a value close to 50 ohms and using a micrometer and the formula Zo =
60*ln(D/d) / e^.5 where D=.675 and d=.165 gives 51 ohms. The location of our
radio room is not the same as the satellite room so we had a contractor run
cable over to existing hardline and patch into it. This new cable is 75 ohm.
(I wonder how much of a problem we are going to have if the original cable is
50 ohm?)
I assume we need 75 ohm N connectors at the radio end of this new cable. Is
that a correct assumption?
Thanks, Pete
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Pete Brunet -- IBM Special Needs Systems, 11400 Burnet Road, MS 9448, Austin,
TX 78758
(512) 838-4594 voice, (512) 838-9367 fax, brunet@us.ibm.com, ws4g
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