RG58 koppeling (Toestel of techniek)

door soundman2 , Wouw, 15-06-2020, 21:51 (1409 dagen geleden) @ Leo Bolier
Gewijzigd door soundman2, 15-06-2020, 22:03

Een BNC voor 75 Ohm is anders als voor 50 Ohm.
Hier staat het uitgelegd
https://www.milestek.com/blog/index.php/2011/04/50-ohm-vs-75-ohm-bnc-connectors-explained/

So what’s different?

Physically, the main differences can be found in the center pins and dialectric insulators. 75-ohm BNC connectors feature Teflon as a dialectric, and surround the outer spring fingers with air. Its center pin maintains a consistent diameter in both the front and rear areas (this is important—read on to find out why). 50-ohm connectors, on the other hand, use Delrin to surround the spring fingers, and its center pin is larger in the crimp area. You’ll need different crimp tools for each type of center pin.

What’s the difference in functionality?

Both connectors can mate without damage, but you can’t really mix and match and expect to get the same video quality. For example, if you installed a traditional 50-ohm BNC connector on a 75-ohm coaxial video cable, the digital signal would be significantly distorted.

Basically, 50-ohm BNC connectors are used for older analog video applications. But for higher performance A/V applications like HDTVs, 75-ohm BNC devices are necessary. 75-ohm BNC connectors can, however, be used for analog purposes.

(Tip: The center pin MUST have the same diameter in the crimp area as the mating area in order to have true 75-ohm impedance. If a connector claims to be 75-ohm but doesn’t have a consistent pin length, it’s an inferior product that won’t give you what you need.)