[time-nuts] RG 6 U couplings

Mark Spencer mark at alignedsolutions.com
Tue Dec 8 14:20:35 EST 2015


I looked up the part number of the cable I installed and the data sheet says it does have Teflon insulation.  It does look different than other Teflon cables I have seen though. My main concern was and is the fire rating.  The comments about the phase stability are also of interest.   If anyone has this type of data for RG 6 style cables I'd be interested in seeing it.   

If I ever run new cables to the roof I might pull an new run of rg6 for the GPS.

At one point I was looking at ways to safely route non fire rated hard line to my GPS receiver.   


Sent from my iPhone

> On Dec 7, 2015, at 6:33 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> 
> 
> 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.
> 
> 
> -- 
> These are my opinions.  I hate spam.
> 
> 
> 
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