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Mystery Coax Cable

Mar 17th 2016, 22:43

kb1yvr

Joined: Nov 5th 2012, 09:47
Total Topics: 0
Total Posts: 0
I was given a 300 foot roll of coax cable but I do not recognize it. I was told it is 50 ohm cable.

Does anybody recognize it, know what the specs are or where I might find out?

It is a medium blue color and is marked DEC P/N 1700248-01 SIGNAL COAX ASPO 12 AWG (UL) CL2.
Mar 18th 2016, 02:57

AA6E

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
DEC is the old Digital Equipment Corp. which supplied so-called 10base5 Ethernet for its computer systems in the 1980s. See https://en.wikipedia.org/wiki/Ethernet#/media/File:10Base5transcievers.jpg . The coax was a nominal 50 ohms, similar to RG-8 or RG-213. You would tap into it with a "vampire" connector that clamped on the outside of the cable and inserted a pin through to the inner conductor to make a connection. It ran at a whopping 10 Mbits/sec. See https://en.wikipedia.org/wiki/Ethernet for more details.

It should be reasonably good for HF radio applications, I'd think. It was used for its for low loss, rather than high power, but I'd expect it to handle amateur power levels OK.

There is more info in a discussion at eham: http://www.eham.net/ehamforum/smf/index.php?topic=36140.0.

73 Martin AA6E
Mar 18th 2016, 12:42

kb1yvr

Joined: Nov 5th 2012, 09:47
Total Topics: 0
Total Posts: 0
AA6E,
Thank you so much for that info! I really appreciate it.
Tom
KB1YVR
Mar 18th 2016, 12:42

kb1yvr

Joined: Nov 5th 2012, 09:47
Total Topics: 0
Total Posts: 0
AA6E,
Thank you so much for that info! I really appreciate it.
Tom
KB1YVR

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