On Jul 17, 11:59*pm, Jeff Liebermann wrote:
On Wed, 18 Jul 2012 03:24:41 +0000 (UTC), gregz
wrote:

The stuff was 300 ohms. I'm pretty sure the name was belden super permaohm.
This was back in the 60's . The only reference I find, is my own. I do find
another name, city color by belden. Twin 26 gauge wires with foil shield..
Greg

It was called Belden "Permohm" and later changed to Belden "City
Color". *Belden recommended it for locations with high interference
levels. *The loss is about the same as the equivalent length of coax
cable. *I checked the online Belden catalog and didn't find any manner
of twinlead. *Belden allowed the Permohm trademark to expire in 2001:
http://www.trademarkia.com/permohm-72089125.html
City Color is a listed trademark, but not by Belden.

Scroll down to "WR-TWIN-TV" and "WR-TWIN-TV-100":
https://www.fairradio.com/catalog.php?mode=view&categoryid=228
That's not a Belden part number. *I don't know where they got the
stuff. *Belden may have sold the product to someone else.

Drivel: *We had a local ham that spent some time characterizing the HF
transmission line characteristics of 12-2 Romex power cable. *It
actually worked reasonably well until the price of copper made it
uneconomical. *Ummm... not recommended for TV or FM use.

--
Jeff Liebermann * *
150 Felker St #D * *http://www.LearnByDestroying.com
Santa Cruz CA 95060http://802.11junk.com
Skype: JeffLiebermann * * AE6KS * *831-336-2558

Never thought of using Romex for RF. It would indeed be interesting to
see what it's characteristic impedance would be at different
frequencies though. I wish I had the time to experiment with that. Too
busy trying to pay the electric bill. I suppose if I'm ever on a
desert island and have to get the transmitter on the air and all I
have is Romex well, I suppose I'd give it a try.

I used that shielded 300 ohm Belden Permohm back in the 60's when I
lived in The Bronx. I think I still have a bunch of it around here
too. I had a Vbeam antenna, (just about everyone did). All NYC TV
stations were VHF except for 31 which was municipal and 47 which was
Spanish. I received them all on my Vbeam. All but 47 which was from
New Jersey and mostly ran test patterns, (remember test patterns),
broadcast from the Empire State Building 15 miles away in Manhattan.
Reception was never a problem. I had no pre amplifier but used a rotor
for DX'ing. I sometimes could get low band from Boston and Connecticut
and once pulled in 13 from Prince Edward Island Canada. We had a 1951
TV/FM console receiver made by Pilot Radio. This was like the wild
west of TV. That was pretty thrilling for a kid. Lenny