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BNC Question -- sort of

D

Don Lancaster

What do you call a somewhat BNC like connector that has a PAIR of male
and female balanced connectors in it?

Does not seem to answer to "Horace".

--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: [email protected]

Please visit my GURU's LAIR web site at http://www.tinaja.com
 
J

John Larkin

What do you call a somewhat BNC like connector that has a PAIR of male
and female balanced connectors in it?

Does not seem to answer to "Horace".
Click to expand...

Do you mean a single twisted pair + shield? "Twinax."

Pasternack PE4238 maybe.

John
 
J

John Fields

What do you call a somewhat BNC like connector that has a PAIR of male
and female balanced connectors in it?

Does not seem to answer to "Horace".
Click to expand...
 
J

John Woodgate

I read in sci.electronics.design that Don Lancaster <[email protected]>
wrote (in said:
What do you call a somewhat BNC like connector that has a PAIR of male
and female balanced connectors in it?

Does not seem to answer to "Horace".
Click to expand...

No, it wouldn't. If it's both male and female, it would have to be
'Robin' or 'Sydney' or 'Martin'....

Does it have two pins/sockets in each of four outer tubes or...?
 
D

Don Lancaster

maxfoo said:
Twinax has two pins in the center like the pic below.
http://www.amphenolrf.com/products/twinax.asp

However, you are describing 4 pins in the center...hmmm...interesting...
Click to expand...

Does not look at all like the above.

Outside looks exactly like BNC.
Inside dielectric is split in half with a step.
Low step has gold pin. High step has gold socket.

From a 1990's era automatic test set.
Ordinary BNC's went through special transformers to these connectors
which went to a special rf switch.
Rest of circuit board consisted of zillions of reed relays and LED's.

DCM brand.
--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: [email protected]

Please visit my GURU's LAIR web site at http://www.tinaja.com
 
T

Tom Woodrow

It is still a Twinax connector. We used that by the 1000's when I was at
Aydin Energy Systems for differential inputs. They were not that reliable.

Tom Woodrow
 
T

Tom Woodrow

Yup, that is the one. Maybe the cable was twinax .. a twisted pair with
a shield.

Tom Woodrow
 
R

Rich Grise

Does not look at all like the above.

Outside looks exactly like BNC.
Inside dielectric is split in half with a step.
Low step has gold pin. High step has gold socket.

From a 1990's era automatic test set.
Ordinary BNC's went through special transformers to these connectors
which went to a special rf switch.
Rest of circuit board consisted of zillions of reed relays and LED's.

DCM brand.
--
Click to expand...

If you really want to get ootsy-tootsy technical, according to a rep
I talked to from some big connector outfit, it's a BNC. BNC, so he
says, means "BayoNet Connector". So that just defines the shell. But
I don't know what the hermaphroditic contacts make it. Maybe Pat? ;-)

Cheers!
Rich
 
J

John Smith

Rich Grise said:
On Thursday 30 September 2004 05:27 pm, Don Lancaster did deign to grace
us
with the following:
(snip)

If you really want to get ootsy-tootsy technical, according to a rep
I talked to from some big connector outfit, it's a BNC. BNC, so he
says, means "BayoNet Connector". So that just defines the shell. But
I don't know what the hermaphroditic contacts make it. Maybe Pat? ;-)

Cheers!
Rich
Click to expand...


The rep was wrong. "BNC" stands for "Bayonet Neill-Concelman" which was
designed 40 years ago by two engineers at Bell Labs and Amphenol who were
searching for a constant-impedance coaxial connector. Paul Neill and Carl
Concelman went on to design six of the most widely used connectors in the
microwave realm.

I paraphrased the above from chapter 5 in "The ARRL UHF/Microwave
Experimenter's Manual" written by Dr. Paul Shuch, N6TX.

"TNC" is for "Threaded Neill-Concelman" and type "N" is for "Neill".

Cheers,
John
 
G

Guy Macon

The origins of the name BNC are *not* very clear.
If anyone says that they know for sure, ask them
for documentation from the 1950's. Alas, there is
a *lot* of recent documentation, but none of it ever
manages to reference a source from the 1950's...

Let's look at the history:

In the 1950's Paul Neill developed a connector
called the N Connector (Neill connector?)

Around that time, Carl Concelman developed a connector
called the C Connector (Concelman connector?)

Then they worked together and developed the BNC and
TNC Connectors.

We Are fairly sure that the "T" in TNC stands for
"Threaded", so it makes sense that the "B" stands
for "Bayonet", giving us "Bayonet Neill-Concelman"
Connector.

Some people claim that BNC stands for "Baby N Connector
or possibly "British Naval Connector" or "BayoNet
connector."

Open questions:

Why Bayonet Neill-Concelman instead of Neill-Concelman
Bayonet? Why Threaded Neill-Concelman instead of Neill-
Concelman Threaded?

Can someonbe who has seen an N Connector, C Connector,
BNC Connector, and a TNC Connector please describe them
and tell us if a BNC looks like a smaller version of N?

Can anyone confirm that the British Navy used this
connector as a standard?

Can anyone document a company using the term "BayoNet"
instead of "Bayonet?"

Can anyone find anything written by Paul Neill or Carl
Concelman Than calls it a "BNC Connector?" How about
a "BN Connector"? That would tell us about the "C".
 
A

Alan

Can someonbe who has seen an N Connector, C Connector,
BNC Connector, and a TNC Connector please describe them
and tell us if a BNC looks like a smaller version of N?
Click to expand...
I can tell you that the N male will mate with a BNC female
without any problems.

The BNC, of course, is a bayonet fixing while the N is a
larger diameter with a screw thread fixing arrangement but
the centre portions of the N are the same dimensions as
the BNC so they will mate. The only disadvantage of this
is that there is now retaining mechanism in play so they
do tend to disconnect easily but useful for quick tests.

Alan

++++++++++++++++++++++++++++++++++++++++++
Jenal Communications
Manufacturers and Suppliers of HF Selcall
P O Box 1108, Morley, WA, 6943
Tel: +61 8 9370 5533 Fax +61 8 9467 6146
Web Site: http://www.jenal.com
e-mail: http://www.jenal.com/?p=1
++++++++++++++++++++++++++++++++++++++++++
 
R

Rich Grise

The rep was wrong.
Click to expand...

What??!?!??!! Naaaahhhhh ...... ;-)
"BNC" stands for "Bayonet Neill-Concelman" which was
designed 40 years ago by two engineers at Bell Labs and Amphenol who were
searching for a constant-impedance coaxial connector. Paul Neill and Carl
Concelman went on to design six of the most widely used connectors in the
microwave realm.

I paraphrased the above from chapter 5 in "The ARRL UHF/Microwave
Experimenter's Manual" written by Dr. Paul Shuch, N6TX.

"TNC" is for "Threaded Neill-Concelman" and type "N" is for "Neill".
Click to expand...
Thanks for this - very enlightening! (although, we haven't answered Don
Lancaster's question yet, that I know of.)

Cheers!
Rich
 
J

John Woodgate

I read in sci.electronics.design that Guy Macon <http@?.guymacon.com>
Can anyone confirm that the British Navy used this connector as a
standard?
Click to expand...

It's most unlikely that just one connector would be singled out for that
honour. In any case, it would have been called 'RNC', for '**Royal**
Navy Connector'.
 
R

Rich Grise

Open questions:
Click to expand...
Boy, you sure ask a lot of questions for a guy from New Jersey.
Why Bayonet Neill-Concelman instead of Neill-Concelman
Bayonet? Why Threaded Neill-Concelman instead of Neill-
Concelman Threaded?
Click to expand...

Poor Self-Esteem?
Can someonbe who has seen an N Connector, C Connector,
BNC Connector, and a TNC Connector please describe them
and tell us if a BNC looks like a smaller version of N?
Click to expand...

Yes, kind of.
http://www.amphenolrf.com/products/typen.asp
In an N connector, there's the pin, of course, and the shield,
which is the same ID as the ID of the shield of the coax, so
there's a constant impedance thru. The shell is just mechanical
attachment and chassis ground.
C, I don't know.
BNC, now that you mention it, has the same kind of contact
arrangement - the electrical shield is at a constant radius,
to line up with the coax shield, but the shell is, as we all
know, the bayonet. TNC is a little tiny, about 1/2 scale
BNC, unless it's the little tiny 1/2 scale N or F. The F,
of course is the "standard" cable TV cable connector.
Can anyone confirm that the British Navy used this
connector as a standard?
Click to expand...

Not me.
Can anyone document a company using the term "BayoNet"
instead of "Bayonet?"
Click to expand...

No, I just made that up. He actually pronounced the word with
the capital 'N'. "Bayo, Net, Connector."
Can anyone find anything written by Paul Neill or Carl
Concelman Than calls it a "BNC Connector?" How about
a "BN Connector"? That would tell us about the "C".
Click to expand...

Yeah, maybe the C just stands for "Connector." ;-)

Cheers!
Rich
 
J

John Woodgate

I read in sci.electronics.design that Rich Grise <[email protected]>
wrote (in said:
TNC is a little
tiny, about 1/2 scale BNC, unless it's the little tiny 1/2 scale N or F.
Click to expand...

TNC is just like a BNC but with a threaded shell instead of a bayonet.
 
R

Ratch

See http://www.webopedia.com/TERM/B/BNC_connector.html . The gender of
the BNC connector is determined by whether the inner wire inserts, or is
enclosed. The locking collar and pins are out of the picture insofar as far
as determining its gender. That is what a electro parts dealer once told
me. So a scope input terminal BNC is female and a scope probe BNC is male.
Ratch
 
F

Fred Bloggs

Guy said:
The origins of the name BNC are *not* very clear.
If anyone says that they know for sure, ask them
for documentation from the 1950's. Alas, there is
a *lot* of recent documentation, but none of it ever
manages to reference a source from the 1950's...

Let's look at the history:

In the 1950's Paul Neill developed a connector
called the N Connector (Neill connector?)

Around that time, Carl Concelman developed a connector
called the C Connector (Concelman connector?)

Then they worked together and developed the BNC and
TNC Connectors.

We Are fairly sure that the "T" in TNC stands for
"Threaded", so it makes sense that the "B" stands
for "Bayonet", giving us "Bayonet Neill-Concelman"
Connector.

Some people claim that BNC stands for "Baby N Connector
or possibly "British Naval Connector" or "BayoNet
connector."

Open questions:

Why Bayonet Neill-Concelman instead of Neill-Concelman
Bayonet? Why Threaded Neill-Concelman instead of Neill-
Concelman Threaded?

Can someonbe who has seen an N Connector, C Connector,
BNC Connector, and a TNC Connector please describe them
and tell us if a BNC looks like a smaller version of N?

Can anyone confirm that the British Navy used this
connector as a standard?

Can anyone document a company using the term "BayoNet"
instead of "Bayonet?"

Can anyone find anything written by Paul Neill or Carl
Concelman Than calls it a "BNC Connector?" How about
a "BN Connector"? That would tell us about the "C".
Click to expand...

Not true- any of it- I have a short history of RF connector development
written and re-written by Hewlett-Packard from the 50's, and BNC in
their book means Bayonet Naval Connector because it was developed
specifically for the military market. It was not too long ago that a
full 70% of the entire US RF/microwave industry was employed to provide
products for defense.
 
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