Wow, and inverted vee for 80 meters at 1/2 wavelength height is a very good antenna. Maybe you meant 1/4 wavelength. To answer the question you asked, an inverted vee at 140 feet will beat the heck o
I just noticed in your post you said that your sweep display looks like a pocket comb. That's the same information you would get from the PSK31 waterfall I was suggesting. This is a good indication t
Is there a version of these PL259 crimp-on connectors available that will fit 75 ohm TV cable? The most common size cable has an OD of about 0.28 (0.2 with the outer jacket removed) and a center diam
..."Above the top at 35 feet is a triband. I have a wire spaced 1 foot from the tower and attached at the 30 foot point. I feed it at the bottom with coax and many radials. On 80 cw with 50 watts I w
One other item regarding phasing two different type verticals. The phase of the current in the shunt fed tower will not be what you expect due the matching network. You have to know the phase of this
I'm assuming your tower is really galvanized steel and not raw iron. I posted this message about a year ago. It seems to go against conventional wisdom around here, but I got no response from anyone.
..."No it is not... It is really raw iron as I wrote the same use for rebar (the iron which goes in the concrete, is this the wrong term rebar?)"..... Ok. That's a surprise. Yes, rebar is the correct
You overlooked one other complicating factor, feedline length. The length of the feedline on the unused antenna determines if the unused antenna looks resonant or not. Considering only two of the ant
You are going to need something more than just a loading coil to match it. A 40 ft vertical with an 80 uh coil at the base, using #14 wire, should be resonant on 160 meters but the feedpoint impedanc
It's not immediately obvious as to what is going on with these coils. The additional loss is from the dissipation factor of the dielectric which is a function of the electric field strength. Also the
You are correct Jim, there is a difference between using bare wire and insulated wire when folding it back. Either technique will "work" but they work differently. If you use bare wire, and determine
I would be interested in hearing what kind of phasing is being used on the K9AY four square. When I looked at doing this I was never able to achieve performance as good as I thought might be possible
Here is my answer to your question about a comparison between a K9AY four square and that of a full size four square on 160 meters. Assume a full size 160 meter 4 square 1/4 wave spacing and a K9AY 4
A couple of words about RDF (Receiving Directivity Factor) and DMF (Directivity Merit Figure). Both of these may be used as a kind of figure of merit for receiving antenna performance, but neither of
Using 180 degree phasing has several advantages including the advantage of being easily implemented, especially since you can get a broadband version by using a transformer. However if you are talkin
Yep, rain static. I used to get this often when I operated mobile HF in Florida. Whenever the rain drops were charged, the noise was always proportional to the speed of the car. At about 60 mph I cou
DON'T ISOLATE the radials of your vertical from an earth connection. This would be a disaster waiting to happen, both for safety and lightning protection. Tying your feedline into your tower ground s
I guess the answer depends on what you consider to be a significant loss. For an elevated radial vertical, the amount of loss you get from a ground connection varies depending on the exact configurat
WX7G wrote: ..."does anyone run simulations or calculations on lightning strikes. A common direct stike is 100 kA with a risetime of 8 us, correct? If so, using an inductance of 200 nH/ft, the voltag
..."The book "grounds for lightning protection" from polyphaser has those examples and formulas in it. They tell you how to estimate how much voltage will appear in different parts of the system. You