Hi.
Is it possible to connect twin axial cable to a co-axial connector?
If so, what is the best way to do this.
Thank you

 

Is this what you mean?

 

They used to be a common item for 75Ω twinax to the cable terminal on the back of TV sets. Probably have some hidden away in a junk box, BUT they are 75Ω as is twinax. Just what are you trying to connect at what impedance? Seems that now there is another kind of twinax than what I used to deal with as a HAM.

 

Its basically an impedance matching RF transformer.
I believe twinax is 300 ohms

 

They used to be a common item for 75Ω twinax to the cable terminal on the back of TV sets. Probably have some hidden away in a junk box, BUT they are 75Ω as is twinax. Just what are you trying to connect at what impedance? Seems that now there is another kind of twinax than what I used to deal with as a HAM.

We sometimes use twinax for charged particle faraday pickup connections.


TWBNC
https://www.milestek.com/p-16951-78-ohm-twinaxial-cable-0150-od

TWBNC to TRB triax adapter.

https://blog.pasternack.com/coax-co...d-other-coaxial-and-triaxial-connector-terms/
Deciphering TRB, TRT, TRS, TTM, TRC, TRN, TWBNC, TWTNC, Triax, Twinax, and other coaxial and triaxial connector terms

If you need an adapter, look there.

 

@eetech00 I haven't seen that stuff in years but yes, it was basically a 300Ω to 75Ω (RG-59?) transformer. What we called twinax (plastic flat 2-wire antenna "cable") is not what they are now calling twinax for data transmission networks. That old stuff had no ground shield like a true coax. Just a cheap form of the very old Ladder-Wire for antennas.

 

@eetech00 I haven't seen that stuff in years but yes, it was basically a 300Ω to 75Ω (RG-59?) transformer. What we called twinax (plastic flat 2-wire antenna "cable") is not what they are now calling twinax for data transmission networks. That old stuff had no ground shield like a true coax. Just a cheap form of the very old Ladder-Wire for antennas.

We never called the 300 ohm RF stuff 'twinax', we only called it 'twin lead' for twin wire lead-in cable.
https://en.wikipedia.org/wiki/Twin-lead

Transmitter cable.


Receiver cable


Shield pair twinax


Only a few antenna systems (fixed frequency VHF emergency radio systems) were still using ladder-lead feed systems when I was in, almost everything was HELIAX pressurized coax cables to antennas like this.

I just noticed that here on the video, they have what we called, the 'Coke Machine', it was TS/SCI rated secure voice switcher.

The RED equipment cabinet in the receiver technical control space.

 

We never called the 300 ohm RF stuff 'twinax', we only called it 'twin lead' for twin wire lead-in cable.
https://en.wikipedia.org/wiki/Twin-lead

Yes. I also remember it as "twin Lead".

 

@eetech00 I haven't seen that stuff in years but yes, it was basically a 300Ω to 75Ω (RG-59?) transformer. What we called twinax (plastic flat 2-wire antenna "cable") is not what they are now calling twinax for data transmission networks. That old stuff had no ground shield like a true coax. Just a cheap form of the very old Ladder-Wire for antennas.

The coupler I remember had a coax connector with a barrel type body containing a transformer. The twin-lead stuck out the other end with each wire terminated with spade terminal.

 

The Twinax cables that I am familiar with were for linking computers MANY LONG YEARS AGO. That stuff had a differential pair inside a single coaxial shield.We had hundreds of pounds of it and never found a decent use for it because of te strange connectors.

 

The Twinax cables that I am familiar with were for linking computers MANY LONG YEARS AGO. That stuff had a differential pair inside a single coaxial shield.We had hundreds of pounds of it and never found a decent use for it because of te strange connectors.

We have some odd-ball Twinax connectors that I only see in some older cryogenic pumping networking systems today.
http://www.interfacebus.com/Design_1553_Twinax_Connector.html

https://www.belfuse.com/product/pro...rompeterCinchConnectivitySolutionsProductType

 

I found this after a few minutes of rooting through the junk tubs. It's the opposite of what I was looking for. This is one used for TVs with screw terminals instead of a coax port to bring cable TV to screwed connections. Yeah, we also called it twin lead but around here ~45 years ago it was also being called twinax albeit probably improperly so. I looked around and found already terminated twinax cables but not the terminals alone.

 

Transmitter cable.

"Ladder Line"

Yes, "twin lead" is 300Ω unshielded parallel transmission line. It was conveniently matched to folded dipoles. Twinax is the parallel conductor version of coax—hence the name. It's basically balanced line shielded pair.

 

The "Twinaxial" cable was never ever used for Television applications. It was a computer interface .
Twin LEAD is an entirely different animal still used for some varieties of antennas and connections. Totally different in every aspect.

 

The "Twinaxial" cable was never ever used for Television applications. It was a computer interface .
Twin LEAD is an entirely different animal still used for some varieties of antennas and connections. Totally different in every aspect.

Just a nitpick: Twinax has properties that makes it very useful for some applications that have nothing to do with computer networking. Any place high frequency differential signaling is needed twinax (shielded twisted pair) is a candidate. It is also used in connection of sensors, and interconnection of test gear in noisy environments.

 

Just a nitpick: Twinax has properties that makes it very useful for some applications that have nothing to do with computer networking. Any place high frequency differential signaling is needed twinax (shielded twisted pair) is a candidate. It is also used in connection of sensors, and interconnection of test gear in noisy environments.

My comment was primarily because it seemed that some confuse "Twinax cable" with TwinLEAD cable. Certainly very different .