[TowerTalk] 75 or 70 Ohm twinlead or ladderline cable - does it exist?

[n8de at thepoint.net]

In the 70's, there was a product named 'Saucerline' .. which had  
circular plastic insulators which were donut-shaped.  It was 75 ohm  
line.

73
Don
N8DE

Quoting Herbert Schoenbohm <herbert.schoenbohm at gmail.com>:

> Telephone C drop wire may work in your case and it is very strong. I
> believe the characteristic impedance is 70 ohms.
>
> On 3/24/2014 4:15 PM, jpk5lad at cox.net wrote:
>> From where I'm sitting, I can see a run of Kilowatt Twinlead   
>> running up the wall, into the attic
>> 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 owned a ham store in the 70s, I bought it from Dentron  
>>  in a 100' length.
>> Dentron offered both the 450 ohm window line and the 300 ohm KW   
>> Twinlead through their
>> dealers.
>> .
>> I do remember (I'm from the 1957 era) both a lighter duty 75 ohm   
>> twinlead and a much,
>> much heavier 75 ohm twinlead although I don't recall ever using it.  
>>   Perhaps they were both
>> spec'ed at 72 ohms, it's been too many years to remember that   
>> particular detail.
>>
>> Around our neck of the woods, I believe only the 300 ohm heavy and   
>> thick twinlead was
>> referred to as "Kilowatt Twinlead."
>>
>> Just musings from another old timer.
>>
>> 73,
>> Jim - K5LAD
>>
>>
>>
>> On 24 Mar 2014 at 12:45, Jim Brown wrote:
>>
>>> On 3/24/2014 11:36 AM, Drax Felton wrote:
>>>> It's 72 ohm twin lead.  Also known as zip line.
>>> 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 AWG #13
>>> stranded copper conductors spaced apart by 2-3 conductor diameters by a
>>> rather beefy dielectric. My old Belden catalog from 1971 says it's part
>>> number 8210, is 72 ohms Zo, 0.67 Vp. I actually have several hundred
>>> feet, what's left from a 250 ft spool that I bought "new old stock" at
>>> the Milwaukee hamfest sometime in the 70s, figuring that I'd someday
>>> find a use for it. 25 years later, I did, and it fed an 80/40 dipole
>>> that I also loaded as a Tee vertical on 160M.
>>>
>>> I also have some junk lengths of the Amphenol product, which looks a bit
>>> less robust.  Both products have been discontinued for several decades.
>>>
>>> Last I looked (about 7 years ago), I think I remember DXE was selling a
>>> window line that they described as 100 ohms.
>>>
>>> 73, Jim K9YC
>>> _______________________________________________
>>>
>>>
>>>
>>> _______________________________________________
>>> TowerTalk mailing list
>>> TowerTalk at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
>>
>> ===============================
>> Life is like a football ---
>> It ain't round ... It'll bounce funny on ya.
>>
>> http://www.hayseed.net/~jpk5lad/
>>
>>
>> ---
>> This email is free from viruses and malware because avast!   
>> Antivirus protection is active.
>> http://www.avast.com
>>
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk at contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk