Agilent Infiniium 54855A broken BNC connector - Page 1
Forum section: electronics / repair

author: ARF
author_rank: Regular Contributor
timestamp: September 08, 2023, 12:36:59 pm
content: Hi guys, I'm looking for advice.During a delivery of the oscilloscope, the BNC connector AUX Trigger Input was mechanically damaged. The connector was crushed and cracked during the repair process. Some brittle alloy is used.I know it's not a very important connector, but it bothers me.Inside the scope this is a cable assembly BNC-SMB with a special metal cable (I do not know the type), although the connector itself is the most common.Probably the length of this cable assembly is also important.I'm thinking of trying to solder the cracks and buff the surface or replace the whole cable assembly, but I'm not sure about the length and the right materials.What is your advice?

author: coromonadalix
author_rank: Super Contributor
timestamp: September 08, 2023, 02:08:34 pm
content: you should be able to find some of themcant recall the one on the pcbEDIT SMB i thinksome SMB to chassis mount bnc connector ....like this : or some ressemblance :https://www.fairviewmicrowave.com/ra-smb-plug-bnc-female-cable-m17-113-rg316-coax-fmc2638316-p.aspx

author: ARF
author_rank: Regular Contributor
timestamp: September 08, 2023, 02:12:48 pm
content: Yes, but what about the length and materials, do you see what kind of special cable is used?

author: fant
author_rank: Contributor
timestamp: September 09, 2023, 09:56:13 am
content: Cable Belden 1673A.It is as a semirigid, but more flexible.Can be changed to a semirigid (same electrical characteristics).Mandi

author: ARF
author_rank: Regular Contributor
timestamp: October 11, 2023, 09:03:09 pm
content: I removed this cable assembly. Now the difficulty is to get just such a connector. I don’t know its model and manufacturer, I searched for a long time, but I didn’t find anything like that.The cable is marked "4694122 & 5293001". A search says these are the patent numbers for the 1671A cable. Cable thickness 2.14mm. This means the cable type is RG-405. Does anyone have any idea what kind of connector this is?

author: TimFox
author_rank: Super Contributor
timestamp: October 11, 2023, 10:39:06 pm
content: I think the gold-colored connector is an "SMB".Here is an example of search results from Pasternack about BNC-SMB cable assemblies that they will custom-assemble for you:https://www.pasternack.com/bnc-female-smb-plug-rg141au-cable-assembly-pe3w16934-p.aspx

author: ARF
author_rank: Regular Contributor
timestamp: October 11, 2023, 10:44:42 pm
content: I myself can easily rebuild this assembly if I find this particular BNC connector.

author: TimFox
author_rank: Super Contributor
timestamp: October 11, 2023, 11:05:30 pm
content: I believe Pasternack may have that BNC connector.They are not cheap, but very reliable and their cable assemblies are well made and available in small quantities.You don't post a country--Pasternack is in the US

author: ARF
author_rank: Regular Contributor
timestamp: October 11, 2023, 11:19:58 pm
content: I think no, this is the old and obsolete connector or Agilent custom type(

author: TimFox
author_rank: Super Contributor
timestamp: October 11, 2023, 11:43:21 pm
content: Then I suggest you replace that cable with a compatible unit from Pasternack or similar.