[SI-LIST] AW: Re: bnc connector
- From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
- To: "deibele@xxxxxxxx" <deibele@xxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 20 Mar 2013 08:51:11 +0000
Do you mean the phase performance of the single bnc connector, or the
performance of cable assemblies using bnc or the performance of bnc PCB Launch?
And do you refere to phase differences between different bnc connectors or
repeatability when mating and unmating exactly the same cable?
These are all ultimately different things.
The bare bnc connector has a good repeatability, especially when it is
carefully bottomed in the mating partner (as you know BNC has a small spring
that presses the mating parners together. This allows different mating
positions along the contact. for best repeatability you have to check if they
are fully mated). The mating length differences shouldn't matter much at 50MHz.
When you compare different types of BNC connectors, you will see different
performance, and depending on the contact length you will also see phase
difference (also not much). Real crappy BNC connectors sometimes have a bad GND
connection that can mess up the performance quite a bit (this can then be seen
in phase as well).
If you are talking cable assemblies, then the cable differences should have the
biggest impact on phase variation. By cable differences I mean mechanical and
electrical differences and the quality of the assembly.
Please provide more information about what exactly you did, and what exactly
you are after.
BR
Gert
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
Auftrag von Deibele, Craig Edmond
Gesendet: Dienstag, 19. März 2013 15:01
An: weirsi@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] Re: bnc connector
i agree steve, this is not a delay change.
i guess what i am asking is, what phase performance should one expect for bnc?
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of steve weir
Sent: Tuesday, March 19, 2013 9:56 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: bnc connector
It sounds like you have a stub or poor return situation. 3 deg at 50MHz is
167ps. BNC's can do OK to 3GHz or better. Agilent coaxed ( no pun intended )
them past 5 GHz.
Steve
On 3/19/2013 6:14 AM, Deibele, Craig Edmond wrote:
> i am interested in a relative transmission measurement (magnitude and phase)
> using a cable with bnc connectors. the frequency of interest is relatively
> low, only 50 MHz. simple bench measurements show that the stability of the
> measurement is on the order of 3 degrees. i've looked around for additional
> data or guidance to suggest what tolerance i should expect using bnc.
>
> i've not found anything suitable. does anyone have any references or ideas
> for what to expect?
>
> -craig
>
>
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