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#1
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antenna wire
What are pros and cons of using insulated twisted pair wire for wire
antenna projects? (its what I have handy) Comments invited. |
#2
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Rich,
The best 'pro' is that you already have it! The first 'con' that comes to mind is, is it large enough to hold up it's own weight and not stretch to the next lower band? Within reason, the 'type' of wire/conductor you use to make an antenna just doesn't matter a lot. It has to be a conductor, after that, it has to be available. The rest is up to you. 'Doc |
#3
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What are pros and cons of using insulated twisted pair wire for wire antenna projects? (its what I have handy) Comments invited. Depending on the type of plastic, physical length of insulated wire will be shorter by about 5% for the same resonant frequency vs. bare wire. Otherwise it will work. Yuri |
#4
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Depending on the type of plastic, physical length of insulated wire will
be shorter by about 5% for the same resonant frequency vs. bare wire. Otherwise it will work. Isn't that true just for VHF and higher frequencies due to the velocity factor??? I'm fairly certain that doesn't apply for HF. Jerry -- Jerry Bransford To email, remove 'me' from my email address KC6TAY, PP-ASEL See the Geezer Jeep at http://members.cox.net/jerrypb/ "Yuri Blanarovich" wrote in message ... |
#5
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Jerry, It applies to any frequency. I don't know if I would agree with the 5%, but there is a 'shortening' affect if the conductor is insulated. Is it going to make any real difference on HF? Nope... 'Doc |
#6
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"'Doc" wrote in message
it going to make any real difference on HF? Nope... Exactly. Jerry -- Jerry Bransford To email, remove 'me' from my email address KC6TAY, PP-ASEL See the Geezer Jeep at http://members.cox.net/jerrypb/ |
#7
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.Is
it going to make any real difference on HF? Nope... Exactly. Jerry YES, it makes real difference in calculating the proper length. If you are making, let's say quad for 10m and used EZNEC to calculate the dimensions using bare wire and then used insulated, you would end up exactly in the middle of CB band. Nope? Exactly! What? Is that "any real difference on HF"? Yep, to me is. Using #12 insulated house copper wire makes exactly 5% difference. If you do not care where the antenna resonates, than NOPE. If you care to maintaing performance, pattern, impedance, SWR, than YEP! If you are making long wire antenna or Beverage, than length and shortening factor does not matter. But if antenna dimensions are critical then it DOES matter. As far as performance of insulated wire as a radiator of RF, the effect is negligible. Yuri, K3BU |
#8
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"Yuri Blanarovich" wrote in message
... .Is it going to make any real difference on HF? Nope... Exactly. Jerry YES, it makes real difference in calculating the proper length. If you are making, let's say quad for 10m and used EZNEC to calculate the dimensions using bare wire and then used insulated, you would end up exactly in the middle of CB band. Nope? Exactly! What? Is that "any real difference on HF"? Yep, to me is. Using #12 insulated house copper wire makes exactly 5% difference. If you do not care where the antenna resonates, than NOPE. If you care to maintaing performance, pattern, impedance, SWR, than YEP! If you are making long wire antenna or Beverage, than length and shortening factor does not matter. But if antenna dimensions are critical then it DOES matter. As far as performance of insulated wire as a radiator of RF, the effect is negligible. Yuri, K3BU Yuri: You are answering a question that was not asked. Your answer is excellent if the question we Is it necessary, when calculating element length, to consider the type of wire used? If you calculate based on insulated wire and then build it out of bare wire, it ain't going to work well either. Assuming one calculates for whatever radiating thingy one is using, it makes little difference whether that thingy is bare or insulated. Paul AB0SI |
#9
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On Wed, 10 Dec 2003 03:05:05 GMT, "
wrote: Yuri: You are answering a question that was not asked. Your answer is excellent if the question we Is it necessary, when calculating element length, to consider the type of wire used? If you calculate based on insulated wire and then build it out of bare wire, it ain't going to work well either. Assuming one calculates for whatever radiating thingy one is using, it makes little difference whether that thingy is bare or insulated. Paul AB0SI As I understand it, the formulas are based on bare wire, so if you use insulated, you should take into account a little shortening. That was the only point being made, I believe. Bob k5qwg |
#10
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As I understand it, the formulas are based on bare wire, so if you use
insulated, you should take into account a little shortening. That was the only point being made, I believe. You do want to make it about 5% shorter if you use insulated wire...I built my full wave 80 meter loop out of 13 gauge copper clad steel wire with a polyethylene insulator...and it turned out to be too long...I wouldn't figure the 5% in the equation, you can always trim the extra off. Steve kb8viv |
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