[Elecraft] BNCs

[Joe Subich, W4TV]

 > 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.

I disagree ... *DO NOT MIX 75 and 50 Ohm connectors*.  50 Ohm male
connectors will split the center contact of a 75 Ohm female wile 75 Ohm
male connectors will not make reliable connection with the center
contact of a 50 Ohm female.

In general, a 75 Ohm center pin will not accept the center conductor of
50 Ohm cable and a 50 Ohm center pin can not be *reliably* attached
(either crimp or solder) to the smaller center conductor of 75 Ohm cable
due to the relative sizes.

73,

    ... Joe, W4TV


On 2014-10-13 12:15 PM, 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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