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[email protected] July 11th 08 07:31 PM

copper transmission lines with polumer insulator
 
Hi all,

I am working on an application of transmission lines for use in
magnetic resonance. I know I have seen in the past pre-made
transmission line that has an inner conductor surrounded by a white
insulator ( I think it is Kel-F, it may be teflon) and a copper layer
on the outside. It is quite stiff, and comes in long pieces that can
be bent with a little effort. Does anyone know where I can pick some
of this up? I have been through about 200 google pages with no luck.

Thanks

Jerry[_5_] July 11th 08 09:06 PM

copper transmission lines with polumer insulator
 

wrote in message
...
Hi all,

I am working on an application of transmission lines for use in
magnetic resonance. I know I have seen in the past pre-made
transmission line that has an inner conductor surrounded by a white
insulator ( I think it is Kel-F, it may be teflon) and a copper layer
on the outside. It is quite stiff, and comes in long pieces that can
be bent with a little effort. Does anyone know where I can pick some
of this up? I have been through about 200 google pages with no luck.

Thanks


Try googling Rigid Coax



Jim Lux July 11th 08 09:45 PM

copper transmission lines with polumer insulator
 
wrote:
Hi all,

I am working on an application of transmission lines for use in
magnetic resonance. I know I have seen in the past pre-made
transmission line that has an inner conductor surrounded by a white
insulator ( I think it is Kel-F, it may be teflon) and a copper layer
on the outside. It is quite stiff, and comes in long pieces that can
be bent with a little effort. Does anyone know where I can pick some
of this up? I have been through about 200 google pages with no luck.

Thanks


What you are looking for is generally called semi-rigid coax. There are
3 relatively common sizes (outside diameter): 0.141", 0.085" or 0.086",
and 0.047", as well as other sizes.

There's a lot of different dielectrics and metals available, other than
the usual PTFE and copper. For instance, foamed PTFE for low loss, a
sort of sintered silica, etc. Silver plated stainless steel is used in
cryogenic applications. Aluminum is used in weight sensitive applications.

Vendors are companies like MicroCoax, Haverhill, UniformTube, etc.

googling semirigid coax turns up a lot of hits.

Owen Duffy July 11th 08 10:09 PM

copper transmission lines with polumer insulator
 
wrote in news:75645cce-ec2a-4652-a15d-
:


In the smaller sizes try Googling for UT-141, UT-085, RG-402, RG-405.

Owen

Bryan July 12th 08 07:52 AM

copper transmission lines with polumer insulator
 
me.merritt wrote:
Hi all,

I am working on an application of transmission lines for use in
magnetic resonance. I know I have seen in the past pre-made
transmission line that has an inner conductor surrounded by a white
insulator ( I think it is Kel-F, it may be teflon) and a copper layer
on the outside. It is quite stiff, and comes in long pieces that can
be bent with a little effort. Does anyone know where I can pick some
of this up? I have been through about 200 google pages with no luck.

Thanks


Micro Coax (http://www.micro-coax.com/) is one source for semi-rigid coaxial
cable, and comes in (IIRC) up to 8' lengths. The stuff isn't cheap,
though... be prepared to empty your wallet!

Regards,
Bryan WA7PRC



Jim Lux July 14th 08 10:54 PM

copper transmission lines with polumer insulator
 
Bryan wrote:
me.merritt wrote:
Hi all,

I am working on an application of transmission lines for use in
magnetic resonance. I know I have seen in the past pre-made
transmission line that has an inner conductor surrounded by a white
insulator ( I think it is Kel-F, it may be teflon) and a copper layer
on the outside. It is quite stiff, and comes in long pieces that can
be bent with a little effort. Does anyone know where I can pick some
of this up? I have been through about 200 google pages with no luck.

Thanks


Micro Coax (http://www.micro-coax.com/) is one source for semi-rigid coaxial
cable, and comes in (IIRC) up to 8' lengths.


You can get it in longer lengths (at least 100') in a big coil (it's
like copper tubing, after all).


The stuff isn't cheap,
though... be prepared to empty your wallet!


Depends on what you call expensive.. $4-10/ft in 50' coils is a typical
price. Pasternack sells 5' lengths of 0.085" copper for $3.66/ft



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