[Elecraft] BNCs

[Peter Torry]

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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