David You are correct Dan Schaaf K3ZXL "In the Beginning there was Spark Gap" www.k3zxl.com -- Original Message -- From: "David J. Sourdis - HK1A" <hk1kxa@hotmail.com> To: <towertalk@contesting.com>
The antenna is designed and built and ready to raise. It was just a simple question about if the trap is included in the resonant length or not. I have worked 308 countries on 30 meters with trap ver
I am replacing the 6 BTV with this antenna for low bands. 80 meters on the 6BTV has a way too narrow bandwidth. And, short verticals just don't cut it for long haul in my experience. I could not work
This link only takes me to the home page. (http://www.championradio.com) I want to know where is the related comparison? I want to see how my AV-640 stacks up against the others. Dan Schaaf K3ZXL "In
Right, My AV-640 has worked the world, literally. I could spend a lot of time telling stories . On 12 meters, ragchewed with N2WB op at VP6DX on 12 meters between band opening. I was running 100 watt
I didn't get it to work on 160. !!! But, if you notice, the frequency on the 17 meter band is 10 times the frequency on 160 meters. A tuner can load it. but it is not wise to do so. Once I realized t
I run a KW on 40 with no problems. Dan Schaaf K3ZXL "In the Beginning there was Spark Gap" www.k3zxl.com -- Original Message -- From: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net> To: "Tower and HF anten
The AV-640 is actually a 3/8 wave vertical. I measured it on all bands. That is why the need for the balun. And I am not so sure that it is 4:1. At 3/8 wave, the impedance is quite different from a 1
HyGain calls it a Windom, but a Windom is a single wire fed in from the end. The AV-640 in no way resembles a Windom. It is simply a 3/8 wave vertical and the counterpoise is the other side, analagou
Joe, Go to the ARRL antenna book and look at a windom. It DOES NOT have a break at the feed point for coax center and coax shield. It is a straight wire with the coax center at the off center point.
Jim DO IT !!!!!!!! Dan Schaaf K3ZXL "In the Beginning there was Spark Gap" www.k3zxl.com -- Original Message -- From: "Jim Chaggaris" <jimc@pwrone.com> To: "'Tower and HF antenna construction topics.
Joe, Believe what you like. I prefer to call it for what it really is. The AV-640 is a 3/8 wave vertical with elevated radials ( Counterpoise for those who prefer ). It has a balun for impedance matc
Joe Here is the better question to answer. At what point does a dipole or doublet or Hertz antenna stop being a dipole and start being a Windom in the general terminology that you offer? When it is 1
Jim Exactly !!! And the antenna book also mentions that the single wire feed Windom produces RFI in the shack and it works against a ground. And the single wire feed line also is a radiating element.
Jim For what it is worth, I have not done too much 20 and 15 meter work with the 640 since I have yagis also. However, on 12 meters, I ragchewed with N2WB operator at VP6DX on 12 between pileups usin
Well, Jim. Then it may just be a matter of semantics. You see the AV-640 as a Windom, I see it as a 3/8 wave Marconi monopole ( vertical ) with elevated radials. And since it is 3/8 wave, it has a hi
Here is a vital question before I complete my vertical antenna design. In the case of a ground to cloud lightning storm, is it better to have the feedpoint of the antenna disconnected from coax or sw
I built a new larger antenna and have no more need for my MA160V antenna. It is a nice antenna for a city lot. 35 ft tall and I have worked many countries with it. My max working radius was 8000 mile
Does anyone know where I can find a service manual or instructions on how to disassemble the old TR-44 rotator? I need to do some service on it. Looking for step by step instructions at the best. Dan
I had the same problem with my A3WS. Then a week later the problem went away. I think a critter, maybe a wasp crawled into the drain hole on the trap and either built a nest or just got zapped with t