Author: "tony.kaz--- via TowerTalk" <towertalk@contesting.com>
Date: Thu, 2 Jan 2020 15:32:10 -0500
I have a 80M wire 4-sq with 5 elevated radials at each feedpoint. I use a Comtek box. The verticals are around my tower. It seems to work okay. I also sunt feed the tower on 160M with 60 buried radia
Author: Tony Brock-Fisher via TowerTalk <towertalk@contesting.com>
Date: Thu, 2 Jan 2020 20:54:06 -0500
My question - if I replaced the solid #14 wire with black Teflon coated #20 stranded tinned copper wire am I giving up anything in performance? I would think the Teflon wire would hold up okay? Note
Teflon insulated wire, especially the silver-coated stranded copper I've found on the internet to wind chokes, is VERY nice stuff. And it's expensive. Sometimes it can be quite worthwhile to make ant
I'm using #18 solid Copperweld wire from Davis RF for my 160m Inverted-L antenna. It tarnished quickly to a dark brown and is virtually invisible. I'm not even sure I could spot it up in the air if
If the radiation resistance is only 20 ohms or less, that 0,05 ohms per meter might reduce the efficiency significantly. 73 Peter I'm using #18 solid Copperweld wire from Davis RF for my 160m Inverte
I'm using #18 solid Copperweld wire from Davis RF for my 160m Inverted-L antenna. It tarnished quickly to a dark brown and is virtually invisible. I'm not even sure I could spot it up in the air if
This can be modeled in EZNEC to remove some of the assumptions. A/B test with copper then steel for the material. Wes N7WS I'm using #18 solid Copperweld wire from Davis RF for my 160m Inverted-L a
And now you can buy high-visibility antenna wire! -de John NI0K Jim Brown wrote on 1/2/2020 10:18 PM: Teflon insulated wire, especially the silver-coated stranded copper I've found on the internet to
I just did exactly that. I modeled a simple 80m vertical with one elevated radial 10 feet above ground ... 65 feet of vertical wire, 65 feet of elevated radial. The resonant frequency was 3.65 MHz
Not the best model for evaluating the effect of wire resistance -- ground losses dominate. Better to model with a GOOD radial system. 73, Jim K9YC _______________________________________________ ____
-de John NI0K Many, many years ago when I was in college, I strung a piece of AWG 28 magnet wire out the window of my dorm room. The dark brown enamel was almost invisible. When I had to replace it,
Ground losses are minimal for a tuned radial ten feet above ground, but I wasn't trying to make a rigorous model in the first place because I don't know the specifics of N2TK's setup. You are welco
Is the copperweld copper thickness under consideration sufficient for the skin depth of RF at 160m? Jim ab3cv _______________________________________________ _________________________________________
Not the best model for evaluating the effect of wire resistance -- ground losses dominate. Better to model with a GOOD radial system. or model with a perfect ground - then the ground losses aren't an
Author: "tony.kaz--- via TowerTalk" <towertalk@contesting.com>
Date: Fri, 3 Jan 2020 13:27:12 -0500
Jim, Tnx for the input. On a sunny day the shiny copper really stands out even after all these years. I had bought a bucket (around 80 lbs) of enameled copper from a transformer company years ago. Th
-de John NI0K Many, many years ago when I was in college, I strung a piece of AWG 28 magnet wire out the window of my dorm room. The dark brown enamel was almost invisible. When I had to replace it,
cladding of 40% IACS wire is around 10 mils, as I recall, for AWG 10. So 10% thickness. AWG 16 would be 50 mil diameter, so the cladding would be 5 mils. Skin depth in copper at 2MHz is 1.8 mils. Not
Of course you do not need to use bare 14 awg wire, THHN (available in at least ten different colors) works well for antennas and in that size 500' rolls are very inexpensive. Your 20 awg PTFE is 40%
Some good reading on this topic can be found at https://rudys.typepad.com/files/qex-nov-dec-2k-antenna-wire-conductors.pdf I discovered Rudy's paper after searching for information on the effect of c
Although not a performance issue, the clear Nylon coating of THHN does not hold up well to UV. I typically see it splitting after 1-2 years of being exposed to the sun. Paul, W9AC Of course you do no