Jim,
It may not make a difference to performance on HF but it does matter
because the centre pins have different diameters of solder pot / crimp
barrel to match the cable impedance used. Also incorrectly mated
connectors risk damage to their centre connectors by forcing the
engagement. Use the correct connector for the cable in use.
73
Peter
G3SMT
On 13/10/2014 16:15, Jim Brown wrote:
On Sun,10/12/2014 6:32 PM, Acbross via Elecraft wrote:
Don't know where anyone got the idea that BNCs made for RG-8x we 75
ohm. I worked in the tv industry for many years and we used hundreds
of BNCs that were made specifically for 75 ohm video. By the way,
RG-59 not RG-79.
While you are entirely correct that there are 75 ohm and 50 ohm BNCs,
the difference DOES NOT MATTER at HF, because the connector is such a
small fraction of a wavelength and the difference is small. 75 ohm
connectors were important with analog video because of the smearing of
very fine detail in a high res image, and because studios do lots of
patching and routing.
73, Jim K9YC
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