Maker Pro
Maker Pro

BNC connector

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,506
Joined
Jan 21, 2010
Messages
25,506
Because it can.

Seriously, that question is so unfocused as to have no real answer.

What do you actually want to know?
 

Sankhabrata Chandra

Oct 17, 2017
4
Joined
Oct 17, 2017
Messages
4
Sorry for the unfocussed question. I am a chemistry student and building one instrument and for this I want to know about the BNC connector. I have read few things on that. But my confusion is why BNC connector cannot carry more than 4 GHz signal. In text book it is written that BNC is for 0-4 GHz.
 

davenn

Moderator
Sep 5, 2009
14,124
Joined
Sep 5, 2009
Messages
14,124
I have read few things on that. But my confusion is why BNC connector cannot carry more than 4 GHz signal. In text book it is written that BNC is for 0-4 GHz.


it can go higher ....
good quality ones will get to 10GHz
poor quality ones get lossy in the 5 GHz +

just depends on how much loss you are willing to accept

In text book it is written that BNC is for 0-4 GHz.

I would almost bet that that wasn't the exact wording aye ?
 

dorke

Jun 20, 2015
2,342
Joined
Jun 20, 2015
Messages
2,342
A bit more elaborated:

To carry an Electromagnetic wave signal at a specific frequency range requires the "media" to be as "smooth" as possible,as not to disturb the prorogation of the signal from one point to the other .
We do this by using "wave guides",most of them are coaxial cables.

The connectors are used at the ends to physically connect the source and destination.
This will insert a disturbance in the wave guide(transmission line) in the form of impedance mismatch because of the way the connector is build,the dielectric used,it's size,the quality of the mechanical connection etc.
These mismatches are defined in many ways, the most common being insertion loss and return loss vs. frequency

The higher the frequency the higher the disturbance.
So, for higher frequencies a better design and build quality is needed..

BNC isn't a good choice for high frequencies,
use N-type(if space and budget allows) or SMA..
For good performance,I personally wouldn't use BNC above 1GHz.

Here is a catalog of K and V types that will reach 65GHz.
For further reading on above 100GHz connectors development look here.
 
Last edited:

hevans1944

Hop - AC8NS
Jun 21, 2012
4,780
Joined
Jun 21, 2012
Messages
4,780
it can go higher ....
good quality ones will get to 10GHz
poor quality ones get lossy in the 5 GHz +

just depends on how much loss you are willing to accept



I would almost bet that that wasn't the exact wording aye ?
This Wikipedia article says the Passband is typically 0 to 4 GHz. Without a deeper understanding of transmission line theory, the OP might be led to believe that somehow at 4 GHz the BNC connector suddenly stops working. Real world devices almost never suddenly stop working. Degradation in performance may occur rapidly, but almost never "suddenly," as in "now it works, and now it doesn't" behavior.
 

davenn

Moderator
Sep 5, 2009
14,124
Joined
Sep 5, 2009
Messages
14,124
Without a deeper understanding of transmission line theory, the OP might be led to believe that somehow at 4 GHz the BNC connector suddenly stops working. Real world devices almost never suddenly stop working

which is why I explained it the way I did ;)
 
Top