Looking for info on 75 or 70 twinlead or ladderline cable. Does such a thing exist? Google search did not come up with anything but maybe I'm overlooking something Tnx BIll AA7XT ____________________
It's 72 ohm twin lead. Also known as zip line. --Original Message-- From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of William Hein Sent: Monday, March 24, 2014 2:28 PM To: towert
There was a product years ago that was called 'saucerline'. It had circular insulators that looked like 'life savers' between the two parallel lines. Not sure if it is still available. 73 Don N8DE Lo
Google search did not come up with anything but maybe I'm overlooking something Tnx BIll AA7XT Spiderbeam uses insulated Wireman CQ-532 PE insulated multistrand copper coated steel for their elements
That's a new one on me, and I've been at this since 1955. Back then, and for several decades thereafter, Belden and Amphenol made a product commonly called "Kilowatt Twinlead," which was a pair of AW
Way back in the day "zip cord" was the common name for AC line cord. Brown, parallel conductors. Yes, it was sometines used as a feed line. As K9YC indicated there was a product sold as 75 transmissi
Hi Don: I remember 75 ohm twinlead built specifically for RF use. It used rather large stranded wire quite close spaced. It was rather stiff and the plastic coating was not the stuff used in Zip cord
A UK supplier - Spectrum Communications - had some 75 Ohm specially made, but I see he recently stopped supplying that in favour of 100 Ohm twin. First item here: http://www.spectrumcomms.co.uk/Aeria
I remember low loss 300 ohm line made by Belden (which implies beefy conductors, and thus low loss, and my copy of the 1971 lists several versions of it, including one rated for 1kW. Remember that Zo
and to standoffs going up the tower. I've used it for years to feed two of my top guy anchors, insulated off to be fed at the top. This KW twinlead was not 75 ohm but was actually 300 ohm. When I ow
Yes, it was sometines used as a feed line. As K9YC indicated there was a product sold as 75 transmission line. 73 Don K5AQ I remember good old 'twisted pair' that we used 'back in the day.' I had a H
Who knew about PL-259's and SWR back then :-) Think the twisted pair was about 75 ohms. Hi Tom, Twisted pair is great stuff, and far better at RF than most folks realize. I'd guess Zo to be between 5
One of the problems with using ordinary twin flex as an HF transmission line is the relatively high dielectric losses associated with the typical insulation materials used; so our usual assumption th
On 3/25/14 9:39 AM, Jim Brown wrote: On 3/25/2014 9:31 AM, Tom Osborne wrote: I remember good old 'twisted pair' that we used 'back in the day.' I had a Heathkit AT-1 and just bend one wire and stuck
Hi Jim I wonder if we are talking about the same 'twisted pair?' The wire I was talking about was the old telephone wire they had back in the 50's and 60's that came from the pole to the house. I thi
Jim, I was specifically thinking of beefy copper, #10 or #12. I've measured 12-2 THHN stranded twisted pair at roughly 55 ohms. Twisted pair used for audio is the the range of 70 ohms. With respect t
Author: Kevin Kidd <kkbroadcastengineering@gmail.com>
Date: Tue, 25 Mar 2014 18:45:22 -0500
It is commonly called "Drop Wire" and is still available from numerous places. I once heard that it was 75ohm twinlead but never checked it. I have used it at numerous locations for dipoles and longw
Probably not. The wire I was talking about was the old telephone wire they had back in the 50's and 60's that came from the pole to the house. I think most of it was probably number 12 or so copperwe
Probably not. The wire I was talking about was the old telephone wire they had back in the 50's and 60's that came from the pole to the house. I think most of it was probably number 12 or so copperwe
I made some further measurements this morning on a length of 10A Figure-8 power cable typical of the sort I've seen UK Hams press into service as RF feedline; the dominance of the dielectric losses w