[TowerTalk] Interconnect Cables

[K8RI]

On 7/14/2013 12:35 PM, Jim Brown wrote:
> On 7/14/2013 9:23 AM, Craig Smith wrote:
>> Single AWG 24 twisted pair, foil shield with drain wire, light gray
>> outer insulation.
>
> Yes, it is lovely to work with, BUT does  no one bother to read the well
> documented problems with this type of cable when it is used outside of
> racks?  I posted a link in this thread several days ago. The late Neil
> Muncy, ex-W3WJE, was made a Fellow of the AES on the basis of his work
> to uncover this and the Pin One Problem.
>
> Gepco (a smaller American cable company) now makes a twisted pair cable
> with a foil and braid shield. It takes longer to terminate, but no RFI.
>

The stuff I have is old, but it is twisted pair with foil and braid.
Like you are describing above.  It came from a plant PA system that was 
pulled out and the wire was sold at the plant auction.  They did that 
two or three times a year.  This same, twisted pair, with foil plus 
braid was use for signal wire from differential pressure cells, temp 
sensors and other "stuff"

When we tore out one of the old reactor buildings there were many 
thousands of feet available that had been in conduit and were like new.

I left there to go to college 26 years ago.

That makes me think back when looking at a 27 inch GD, 3ms monitor and 
remember our first color television set. It was a monstrous 21 inch CRT 
and was a job for two gron men and a teenager to get in the house. On 
top of that, it cost over $4000, or the same as my first computer, two 
decades later.  Think what that would be in today's dollars.

That 27" LG monitor can easily be lifted with one hand and only cost 
$240. IIRC it only takes 30 some watts (it's out in the shop)  I have a 
24" Asus, 1 ms, 144 Hz refresh, and it was $260.  and neither has vacuum 
tubes to use power, generate heat and have to be replaced periodically.

Now days, we are unhappy if the TV has to be serviced once in 10 years. 
Back then the service men made house calls and if you watched much 
television they were out a couple times a year. Oh! and the sets had a 
power supply big enough to power a 100 watt output transmitter without 
straining.

73

Roger (K8RI)


> 73, Jim K9YC
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