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Help finding a female BNC connector, PLEASE!!

jonnyGURU

jonnyGURU

Moderator <BR> Power Supplies
Moderator
First, a pic:

IMG_0878.jpg

On the left is what came out of the device and on the right is the wrong one I ended up getting.

The threaded part of the one I need is "D" shaped. The new one is not "D" shaped.

Also, I'm concerned about the shield on the old one. If there's no insulator and one of my wires is soldered to the shield of the one on the right, won't that be grounding against the panel I screw this thing into???

🙁

TIA for any help on this!!!
 
I guess I misunderstood what you were looking for. I searched for female BNC and found this:

link

One side looks like you posted, but the other side doesn't match. What type of connector is that on the top of what you posted? The threading looks like an F-type connector, but then it has some type of solder connection on top.

 
It's a panel mount BNC interface. Essentially, it's so you can put a BNC connector on a device. The threads are just so you canscrew down a locknut. You solder the wires down on the inside.
 
Why, exactly, do you need the D-shaped thread? hole in the front panel of the device?

either file down the threads, or file out the hole on the device.
 
Originally posted by: jonnyGURU
First, a pic:

IMG_0878.jpg

On the left is what came out of the device and on the right is the wrong one I ended up getting.

The threaded part of the one I need is "D" shaped. The new one is not "D" shaped.

Also, I'm concerned about the shield on the old one. If there's no insulator and one of my wires is soldered to the shield of the one on the right, won't that be grounding against the panel I screw this thing into???

🙁

TIA for any help on this!!!
Click to expand...


The "D" shaped one is insulated from the case for an unkown reason. Usually, you can just drill out the case and make it round to accept the new one, so that's not a big deal. Now the case/shield is unusual. For the most part, cases are grounded, so the case of the BNC is supposed to be in contact with the case. In your application, this may not be true? I simply don't know. If your case is grounded, then its no big deal, just drill it out and mount it. If the case isn't grounded, and the BNC's shield is at a different potential than the case, you have to get an insulated BNC like the old one. Check into it.
 
I thought about that, but I thought that the BNC was insulated for a reason.

This is an o-scope output on a piece of test equipment. I didn't think the shield was actually "ground" on this cable, but rather + and - signal which is why I was skeptical about using the all metal BNC.
 
I have been in electronics since the 40's and haven't seen a BNC like the one you show -- but can give a good guess as to why it is that way. The insulated threaded part means that only the central conductor is connected to the other device by the coax since the outer shield in the coax is connected to the shell but not to anything in the test equipment. That would prevent a ground loop (two pieces of gear with differing grounds). Ordinarily we go to great lengths to prevent floating grounds, but for RF it is often better to have the shield float at one end. Try the new connector. It wont hurt anything and if you don't see high frequency noise, RF, you won't know the difference.
 
Originally posted by: Sphexi
Radioshack FTW, they got those back in the drawers.

Text
Click to expand...

No. That's the one on the right. The one I already have. I need the insulated one on the left. Thanks.
 
Hmm. I think at work here we have like 40 of the kind you need. The threaded part is the same shape and is insulated the same as the one on the left in your picture. And they are the only BNCs I've seen around here. They're mounted in this metal box that has many rows of them. But there's two terminals on each connector. I don't know what that's about. But even if they are what you need, that doesn't really help you. But they must be out there then since this thing is maybe 5 years old (our R&D center started in 1999). We order from Mousier, Allied, Newark, etc


edit: Actually I was looking through the Digikey book and they might have what you need (hell I'm bored, it's my last day here, and I don't feel like working cause I got drunk and stayed out late last night). It's called like Bulkhead Isolated Jack. It looks D-shaped and for panel mount as well. About pg 286 in the book I'm looking at. Not sure if you have checked there or not.
 
Listen, sometimes you don't get the female connector that you want. You just have to deal with the one you have. She will still work with your male connector just fine.
 
Originally posted by: duragezic

edit: Actually I was looking through the Digikey book and they might have what you need (hell I'm bored, it's my last day here, and I don't feel like working cause I got drunk and stayed out late last night). It's called like Bulkhead Isolated Jack. It looks D-shaped and for panel mount as well. About pg 286 in the book I'm looking at. Not sure if you have checked there or not.
Click to expand...

Is there a part number?

I don't have the catalog and their website is borderline useless.
 
Ah that looks like the one I seen at Digikey as well. Sorry I couldnt get you a part # earlier jonnyGURU. Work turned out busy afterall on my last day. I thought they were joking or something when they said they needed all this crap by 5pm... bah.
 
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