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Dumb Antenna Questions
Hey. I'm newly licensed tech (studying for General). I looked up
my questions in Handbook but could not find info. I am construct- ing a dipole antenna for 15 Meters from insulated 18 guage battery wire from the auto parts store. Since I will be going QRP for the first weeks or month, I am not worried about power handling capacity. But, will I have to upgrade my wire when I go to 50 or 100 watts output? Also, I have a question about the insulated wi is the insulation an impediment to the functioning of the antenna on HF? Thanks for being patient with a newbie. Rockinghorse Winner KI6AZS |
#2
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Dumb Antenna Questions
Hey. I'm newly licensed tech (studying for General). I looked up
my questions in Handbook but could not find info. I am construct- ing a dipole antenna for 15 Meters from insulated 18 guage battery wire from the auto parts store. Since I will be going QRP for the first weeks or month, I am not worried about power handling capacity. But, will I have to upgrade my wire when I go to 50 or 100 watts output? Also, I have a question about the insulated wi is the insulation an impediment to the functioning of the antenna on HF? Thanks for being patient with a newbie. Short answers: 18 guage will handle 100 watt transmitter. Insulated wire will provide no discernable effect to your antenna performance. Ed K7AAT |
#3
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Dumb Antenna Questions
Thank's, Ed!
73 Rockinghorse Winner KI6AZS |
#4
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Dumb Antenna Questions
Also, in addition to Ed's comment, #16 AWG will handle 1 KW with no problem.
AK Rockinghorse Winner wrote: Hey. I'm newly licensed tech (studying for General). I looked up my questions in Handbook but could not find info. I am construct- ing a dipole antenna for 15 Meters from insulated 18 guage battery wire from the auto parts store. Since I will be going QRP for the first weeks or month, I am not worried about power handling capacity. But, will I have to upgrade my wire when I go to 50 or 100 watts output? Also, I have a question about the insulated wi is the insulation an impediment to the functioning of the antenna on HF? Thanks for being patient with a newbie. Rockinghorse Winner KI6AZS |
#5
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Dumb Antenna Questions
Rockinghorse Winner wrote: Hey. I'm newly licensed tech (studying for General). I looked up my questions in Handbook but could not find info. I am construct- ing a dipole antenna for 15 Meters from insulated 18 guage battery wire from the auto parts store. Since I will be going QRP for the first weeks or month, I am not worried about power handling capacity. But, will I have to upgrade my wire when I go to 50 or 100 watts output? Also, I have a question about the insulated wi is the insulation an impediment to the functioning of the antenna on HF? Thanks for being patient with a newbie. Rockinghorse Winner KI6AZS The only thng that can alter the power output and freq. of the insulated wire is; if water gets between the insulation and the wire. As in rain water. Other wise "goforitQRP is great fun!!! 73 de Bob,WA2EAW...HW8 enthusiast with solar panals. |
#6
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Dumb Antenna Questions
Ditto. No and no.
"Ed" wrote in message . 93.175... ...a dipole antenna for 15 Meters from insulated 18 guage battery wire ... But, will I have to upgrade my wire when I go to 50/100 watts output? NO ...is the insulation an impediment to the functioning NO Put it up. For a 40M dipole, I have insulated 20 guage (with the ends threaded through the end insulators then doubled back and wrapped around the antenns for about three feet, for easy length adjusting if needed). 73, & Enjoy Steve, K.9,D'C;I |
#7
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Dumb Antenna Questions
"bob/wa2eaw" wrote in message oups.com... Rockinghorse Winner wrote: ...is the insulation an impediment to the functioning of the antenna on HF? Thanks for being patient with a newbie. Rockinghorse Winner KI6AZS The only thng that can alter the power output and freq. of the insulated wire is; if water gets between the insulation and the wire. As in rain water. Other wise "goforitQRP is great fun!!! 73 de Bob,WA2EAW...HW8 enthusiast with solar panals. Bob, Hmmm. I don't think this is a worry either. I have had no protection (nor perceive a need) for this where the insulation ends at the feed point nor at the ends that are just cut (which wrap back on the antenna for about 3 feet for adjusting length. It is stranded wire with lots of opportunity for water egress. The insulation is very brittle after 6 years in the UV & other outdoor environment. I don't see what the problem mechanism could be; a bare wire gets really wet. What are you thinking? As a side note, and unrelated situation, aircraft wiring can burst into flames with help from water (Believe it or not) and insulation cracks, but in bundles of wire and where there is significant 400 cycle power distribution energy _between_ wires in a tight cabling bundle, not a single hanging wire. 73, Steve, K,9'D;C.I |
#8
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Dumb Antenna Questions
On 16 Oct 2005 19:35:05 -0700, "Rockinghorse Winner"
wrote: or 100 watts output? Also, I have a question about the insulated wi is the insulation an impediment to the functioning of the antenna on HF? Thanks for being patient with a newbie. Don't overlook the fact that in most cases, insulation increases the wind resistance and increases the mass (weight) of wire antennas, so reducing the survival in strong winds, while not improving the radiation performance. Further, the insulation will degrade more quickly than bare copper in all but the most corrosive environments. Don't change your plans now... but something to keep in mind for the future, especially for long spans. You might ask, if insulated stranded annealed copper is a poor choice compared to say single core hard draw copper or Copperweld, why do so many people use insulated stranded annealed copper? I guess it comes down to availability, and that amateurs seem to not design wire antennas to survive high winds. Owen -- |
#9
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Dumb Antenna Questions
The 18 gauge shouldn't present a problem, for Power, nor Loss.
It , however may present a problem, in the winter, if you get ice loading (can streatch, and also break, if has enough stress (extra weight) applied to it) , but, as far as qrp, on the low bands, you may ve amazed at the dx you can pull in , even with power in the milliwatt range, and, with a couple of the older (10 watt) rigs, like the ft301-s, or the ft-7 (and kenwood, Icom, and Ten-tec made them, too!), can work reliably several hundred miles on 75-40 meters, and THOUSANDS on 20-15, and 10! Have fun-- Jim NN7K Steve Nosko wrote: Ditto. No and no. "Ed" wrote in message . 93.175... ...a dipole antenna for 15 Meters from insulated 18 guage battery wire ... But, will I have to upgrade my wire when I go to 50/100 watts output? NO ...is the insulation an impediment to the functioning NO Put it up. For a 40M dipole, I have insulated 20 guage (with the ends threaded through the end insulators then doubled back and wrapped around the antenns for about three feet, for easy length adjusting if needed). 73, & Enjoy Steve, K.9,D'C;I |
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