Re: [Repeater-Builder] Strange BNC-like connector

2008-07-23 Thread Ted Bleiman K9MDM - MDM Radio
try pasternak he may show this connector. sounds like an HV connector I 
encountered back years ago. its a fooler if you don't look carefully.
mdm

 









Ted Bleiman K9MDM
MDM  Radio     If its in stock...we've got it!
P O Box 31353
Chicago, IL 60631-0353 
773.631.5130  fax 773.775.8096  
 
web http://www.mdmradio.com - 
 email - [EMAIL PROTECTED] DIRECT ALL EMAIL 


--- On Wed, 7/23/08, Bob M. [EMAIL PROTECTED] wrote:

From: Bob M. [EMAIL PROTECTED]
Subject: [Repeater-Builder] Strange BNC-like connector
To: repeater-builder@yahoogroups.com
Date: Wednesday, July 23, 2008, 9:14 AM






I've got an old piece of HP test equipment that has a very strange BNC 
connector on the back. Initially it looks just like an ordinary BNC female 
jack, and an ordinaryh BNC male connector will start to fit it, but...

It has THREE little nibs sticking out the sides at 120 degree offsets, instead 
of the usual two nibs 180 degrees apart.

I've not come upon any other connector like it. A regular BNC male will fit 
inside but the locking ring with two slots won't mate with the three nibs on 
the outside of the jack.

RF Connectors doesn't have anything like it, and I haven't seen one in the 
Mouser catalog. I could post a photo if it would be helpful.

Anyone have a clue?

Bob M.

 














  

Re: [Repeater-Builder] Strange BNC-like connector

2008-07-23 Thread Ed Yoho
Bob M. wrote:
 I've got an old piece of HP test equipment that has a very strange BNC 
 connector on the back. Initially it looks just like an ordinary BNC female 
 jack, and an ordinaryh BNC male connector will start to fit it, but...
 
 It has THREE little nibs sticking out the sides at 120 degree offsets, 
 instead of the usual two nibs 180 degrees apart.
 
 I've not come upon any other connector like it. A regular BNC male will fit 
 inside but the locking ring with two slots won't mate with the three nibs on 
 the outside of the jack.
 
 RF Connectors doesn't have anything like it, and I haven't seen one in the 
 Mouser catalog. I could post a photo if it would be helpful.
 
 Anyone have a clue?
 
 Bob M.

Bob,

It sounds like a triax connector. The have an additional isolated shield 
between the center and outer conductors.

Take a look here:
http://www.amphenolrf.com/products/triax.asp?N=0sid=48867480942E17F;

Ed Yoho
W6YJ


Re: [Repeater-Builder] Strange BNC-like connector

2008-07-23 Thread Bob M.
Yup, that sure looks like it. BNC, single-hole mount, with three bayonet pins 
instead of the usual two. The rest of it sure resembles an ordinary BNC 
connector.

Thanks. This connector has been bothering me for years.

Bob M.
==
--- On Wed, 7/23/08, Ed Yoho [EMAIL PROTECTED] wrote:

 From: Ed Yoho [EMAIL PROTECTED]
 Subject: Re: [Repeater-Builder] Strange BNC-like connector
 To: Repeater-Builder@yahoogroups.com
 Date: Wednesday, July 23, 2008, 1:37 PM
 Bob M. wrote:
  I've got an old piece of HP test equipment that
 has a very strange BNC connector on the back. Initially it
 looks just like an ordinary BNC female jack, and an
 ordinaryh BNC male connector will start to fit it, but...
  
  It has THREE little nibs sticking out the sides at 120
 degree offsets, instead of the usual two nibs 180 degrees
 apart.
  
  I've not come upon any other connector like it. A
 regular BNC male will fit inside but the locking ring with
 two slots won't mate with the three nibs on the outside
 of the jack.
  
  RF Connectors doesn't have anything like it, and I
 haven't seen one in the Mouser catalog. I could post a
 photo if it would be helpful.
  
  Anyone have a clue?
  
  Bob M.
 
 Bob,
 
 It sounds like a triax connector. The have an additional
 isolated shield 
 between the center and outer conductors.
 
 Take a look here:
 http://www.amphenolrf.com/products/triax.asp?N=0sid=48867480942E17F;
 
 Ed Yoho
 W6YJ


  


Re: [Repeater-Builder] Strange BNC-like connector

2008-07-23 Thread DCFluX
It is not Triax, I generally refer to this connector as 'Security
BNC'. Had one in the junk box and put it on a cable and it then I
discovered they were incompatible when I went to put it on the radio.



On 7/23/08, Ed Yoho [EMAIL PROTECTED] wrote:
 Bob M. wrote:
   I've got an old piece of HP test equipment that has a very strange BNC 
 connector on the back. Initially it looks just like an ordinary BNC female 
 jack, and an ordinaryh BNC male connector will start to fit it, but...
  
   It has THREE little nibs sticking out the sides at 120 degree offsets, 
 instead of the usual two nibs 180 degrees apart.
  
   I've not come upon any other connector like it. A regular BNC male will 
 fit inside but the locking ring with two slots won't mate with the three nibs 
 on the outside of the jack.
  
   RF Connectors doesn't have anything like it, and I haven't seen one in the 
 Mouser catalog. I could post a photo if it would be helpful.
  
   Anyone have a clue?
  
   Bob M.

  Bob,

  It sounds like a triax connector. The have an additional isolated shield
  between the center and outer conductors.

  Take a look here:
  http://www.amphenolrf.com/products/triax.asp?N=0sid=48867480942E17F;

  Ed Yoho
  W6YJ

  



  Yahoo! Groups Links






Re: [Repeater-Builder] Strange BNC-like connector

2008-07-23 Thread Ed Yoho
DCFluX wrote:
 It is not Triax, I generally refer to this connector as 'Security
 BNC'. Had one in the junk box and put it on a cable and it then I
 discovered they were incompatible when I went to put it on the radio.

There are quite a few Agilent / HP (and other mfgs) instruments that use 
a triax BNC as shown in the referenced Amphenol link. A couple examples are:
HP-4140B Picoammeter / Source.
HP 4155C Semiconductor Parameter Analyzer

http://www.amphenolrf.com/products/triax.asp?N=0sid=48867480942E17F;

The triax connectors and cables are used to allow an inner conductor, a 
guard shield (or floating return), and an outer shield. This is about 
the only effective way of making accurate fA measurements (especially in 
a semi noisy lab environment).

If you have an instrument with a triax BNC connector on it, and you 
measure from the outer metal to the inner gold shield, they are not 
connected as in a 'normal' BNC.

Ed Yoho
W6YJ
(coming up on 40 years in the semiconductor test field - sigh, must be 
getting old)


Re: [Repeater-Builder] Strange BNC-like connector

2008-07-23 Thread kd6aaj
I remember those in electronics class at the community college. I think they 
are a propriatary connector HP used on their equipment.

--- On Wed, 7/23/08, Ted Bleiman K9MDM - MDM Radio [EMAIL PROTECTED] wrote:

From: Ted Bleiman K9MDM - MDM Radio [EMAIL PROTECTED]
Subject: Re: [Repeater-Builder] Strange BNC-like connector
To: Repeater-Builder@yahoogroups.com
Date: Wednesday, July 23, 2008, 7:21 AM











try pasternak he may show this connector. sounds like an HV connector I 
encountered back years ago. its a fooler if you don't look carefully.
mdm

 









Ted Bleiman K9MDM
MDM  Radio     If its in stock...we've got it!
P O Box 31353
Chicago, IL 60631-0353 
773.631.5130  fax 773.775.8096  
 
web http://www.mdmradio.com - 
 email - [EMAIL PROTECTED] DIRECT ALL EMAIL 


--- On Wed, 7/23/08, Bob M. [EMAIL PROTECTED] wrote:

From: Bob M. [EMAIL PROTECTED]
Subject: [Repeater-Builder] Strange BNC-like connector
To: repeater-builder@yahoogroups.com
Date: Wednesday, July 23, 2008, 9:14 AM




I've got an old piece of HP test equipment that has a very strange BNC 
connector on the back. Initially it looks just like an ordinary BNC female 
jack, and an ordinaryh BNC male connector will start to fit it, but...

It has THREE little nibs sticking out the sides at 120 degree offsets, instead 
of the usual two nibs 180 degrees apart.

I've not come upon any other connector like it. A regular BNC male will fit 
inside but the locking ring with two slots won't mate with the three nibs on 
the outside of the jack.

RF Connectors doesn't have anything like it, and I haven't seen one in the 
Mouser catalog. I could post a photo if it would be helpful.

Anyone have a clue?

Bob M.


 


  

Re: [Repeater-Builder] Strange BNC-like connector

2008-07-23 Thread DCFluX
When I think triax I think about the big connectors used on TV cameras, that
actually use cable with 3 conductors. Basicly a center and 2 shields.  I am
not sure that these connectors actually accept 3 conductor cable (Triax).

On 7/23/08, kd6aaj [EMAIL PROTECTED] wrote:


 



Re: [Repeater-Builder] Strange BNC-like connector

2008-07-23 Thread Bob M.
It does seem that the real triax connector actually has a center pin and two 
shields, hence tri. Twinax used two center pins.

This connector has one center receptacle and one shield connection, just like 
an ordinary BNC. The only difference I can tell is that there are three pins on 
the outside bayonet, equally spaced.

I replaced it with an ordinary BNC jack, but the mounting hole was smaller, so 
I had to use some fender washers to install it. Functionally it's fine, but it 
would have been easier for HP to use an ordinary BNC jack.

Bob M.
==
--- On Wed, 7/23/08, DCFluX [EMAIL PROTECTED] wrote:

From: DCFluX [EMAIL PROTECTED]
Subject: Re: [Repeater-Builder] Strange BNC-like connector
To: Repeater-Builder@yahoogroups.com
Date: Wednesday, July 23, 2008, 4:21 PM

When I think triax I think about the big connectors used on TV cameras, that 
actually use cable with 3 conductors. Basicly a center and 2 shields.  I am not 
sure that these connectors actually accept 3 conductor cable (Triax).