[Elecraft] BNCs

[Sandy Blaize]

The big difference of the 75 and 50 ohm connectors is the fit of the 
connectors to the coax size, NOT the center pin size which is the same.  
BNC connectors are really NOT "constant impedance" especially at VHF/UHF 
frequencies like "proper" "N" series connectors are. This makes no 
difference "impedance" wise on HF gear.  I guess this is also why no one 
has "standardized" on a better connector for the HF frequency range
instead of the PL-259/SO-239"impedance bumps"!

73,
Sandy W5TVW
On 10/12/2014 8:32 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. Now days I build hundreds of cables for RF out of rg-58 and rg-8x BNCs and they use 50 ohm connectors not 75 ohm connectors. Remember that the impedance of coax is based on the ratio of the center conductor to the outer conductor and if you compare the 75 ohm connector you will see that the center pin is much smaller in diameter.
> Anyone need 200 silver plated 75 ohm BNCs?
>
> Art
>
> KC7GF
> Rf Stuff.com
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