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Message |
    
Charliebrown
Intermediate Member
Username: Charliebrown
Post Number: 342
Registered: 10-2002
| | Posted on Friday, June 13, 2014 - 10:26 pm: | 
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There is suppose to be a new type of ham coax that is twin lead and each center wire has it own shield. So the center wire is all you use. One wire for the center connection and the other for the shield. The claim is that you can throw away your swr meter because there is so little swr that a swr meter would not show any. Now do not get upset because I can not find the post on the web again on this subject. SO , CAN ANY PERSON OUT THERE TELL ME IF THERE REALLY IS A NEW HAM COAX LIKE THIS? I have been looking now for two week's and I can not find it. It would be nice if there were such a coax. |
Possum_lodge
Junior Member
Username: Possum_lodge
Post Number: 36
Registered: 5-2014
| | Posted on Thursday, June 19, 2014 - 8:29 am: |
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Charlie, what are you talking about?
COAX is just that COAXIAL CABLE - http://en.wikipedia.org/wiki/Coaxial_cable
Twin lead gets it's name from the design of having two pieces of wire equally spaced..
Coax works on the principal of the Faraday Cage.
http://en.wikipedia.org/wiki/Faraday_cage |
Tech237
Moderator
Username: Tech237
Post Number: 1798
Registered: 4-2004
| | Posted on Thursday, June 19, 2014 - 12:33 pm: |
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There was a "variation" called twin-ax, that did have two shielded conductors inside a separate shield, BUT each shielded conductor was for a separate circuit and was not designed for the inner conductors to be used in the manner you described.
Having said that, I'll be honest and admit I have on an occasion or two used it as shielded twin-lead for dipoles etc - each inner conductor used to feed the antenna and the shields joined together and grounded at one end only.
Tech237
N7AUS
God made me an athiest, who are you to question his wisdom?
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Charliebrown
Intermediate Member
Username: Charliebrown
Post Number: 343
Registered: 10-2002
| | Posted on Thursday, June 19, 2014 - 11:20 pm: |
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Possum Lodge, Thank you for your response. There is always something new around the corner. I am just going on the post of a person that I can not find nor remember where he had made the post. So, as best as I can explain is just as I had said before. Being that this is a new design it would seem to be possible that this would work. If I can find the post I will let every person here know. I had been looking for another person that may have read or seen the post about this. Of course I know you can not trust everything you read on the net. If any person on this forum would know it would be one of the Tech's. I am always looking for way's of less swr and less signal loss in coax because I have 500 foot of coax to my antenna from my home to the top of the mountain. Tech 833 had told me what I really need but that is way out of my budget. How long have you been in this for a hobby? This is about my 46th year for me and I am still learning more about it thanks to people and the Tech's on here. Perhaps since you are in PA we could get on ssb some time. On ssb my number is 55 Of course we might have to wait for some skip condition's. I like 38 lsb.I will listen for you later. |
N8fgb
Intermediate Member
Username: N8fgb
Post Number: 110
Registered: 5-2002
| | Posted on Friday, June 20, 2014 - 7:57 pm: |
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Nothing new or amazing about this. You can buy twin 75 ohm coax and use as balanced twin lead. This allows you run it through walls and windows without worry.
Rich |
Charliebrown
Intermediate Member
Username: Charliebrown
Post Number: 344
Registered: 10-2002
| | Posted on Saturday, June 21, 2014 - 10:19 am: |
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The post was not talking about the twin lead chocolate wire that had been out for age's. It was speaking about 50 ohm coax. It was called coax because it had shielding on each of the lead's. I would assume that the twin lead with each lead having it own shielding would be held together by a plastic cover to hold it together. I sure wish I could find that post again so it could be read here. Any way if it is being made it will show up on the market. Thank you for your reply N8fgb. I guess we will have to wait to see if the information posted by that person I had read is true or just some person putting another lie on the net. |
Tech237
Moderator
Username: Tech237
Post Number: 1799
Registered: 4-2004
| | Posted on Sunday, June 22, 2014 - 11:31 pm: |
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Charliebrown - neither was I, twin-ax has been around for years, but has two separately shielded cables inside of another sheild.
From Wikipedia - Twinaxial cabling, or "Twinax", is a type of cable similar to coaxial cable, but with two inner conductors instead of one. Due to cost efficiency it is becoming common in modern (2013) very-short-range high-speed differential signaling applications.
Tech237
N7AUS
God made me an athiest, who are you to question his wisdom?
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Charliebrown
Intermediate Member
Username: Charliebrown
Post Number: 346
Registered: 10-2002
| | Posted on Monday, June 23, 2014 - 9:04 pm: |
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Thank you Tech 237 for some more information on this subject. I wish who ever it was that had made this post had put some more information on the net instead of leaving me and other's on the subject in the dark. Well, enough said. If I ever can find any post on this or information I will be sure to let every person know about it. I guess for now we will have to wait and see. I thank everyone here for being understanding and helpful on this. |
