[time-nuts] RG 6 U couplings

[Hal Murray]

mark at alignedsolutions.com said:
> Actually I may be misremembering this.    Am not sure if the cable I used
> was Teflon on not.   It did have a defined fire rating though, and I was
> concerned about it's phase stability vis a vis temperatures.

I was at Xerox in the late '70s when the DEC-Intel-Xerox work on Ethernet was 
going on.

The Los Angeles fire dept was sensitive to smoke from cables.  A friend got a 
chunk of potential cable from Belden.  It was Teflon coated.  I don't know 
what was inside.  He took it out on his back porch and hit it with a propane 
torch.  It ignored him.  Well, not quite.  It got smudged a bit, but that 
wiped off.

He took a bigger chunk to Underwriters Lab in Chicago.  They have a setup for 
testing cables.  It's a cable tray in an enclosure that's 20 ft long and a 
few feet wide and 3 or 4 feet tall.  A big gas pipe goes in one end.  There 
is a chimney at the other.  They put the cable in, replace the lid and light 
it up.  The Teflon cable didn't have any problems.

Teflon is expensive.  After a couple of years somebody worked out a cheaper 
compound that was good enough for the fire people.


-- 
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