Hi Don, All problems are exactly the same. I'm not in the least saying coax does or will not work. I'm just mentioning we should be mindful of what it really is, and that is a stub! The longer the c
Good point! While that is a bit better for voltage, there is a much better way still. Connect the shield of the "capacitor" to itself at both ends, and the center conductor to itself at both ends. N
The log might be OK, depending on how the balun is configured and designed. Or it might not be. The elements would be grounded through the balun's common mode impedance. Most baluns won't have enoug
There is freeware available for designing coaxial traps. I tested it on several traps, and it is pretty close. The only error it makes is it considers the capacitance in pF per foot! That means it ca
Looks like the site was changed. Look for the trap download on the page at: http://members.shaw.ca/ve6yp/ 73, Tom W8JI W8JI@contesting.com ___________________________________________________________
The only problem you will have is the resistors will fail during lightning storms much more often than true carbon composition resistors fail. There is absolutely NO electrical or performance differ
A few cautions: Be careful with inductive resistors, like wire wound pots, at radio frequencies. DC resistance can have little to do with RF resistance. If you have a MFJ antenna analyzer, you can s
Remember when you use a "T" tuner, always use the maximum possible capacitance and minimum inductance that provides a match. On lower bands, at least one of the capacitors should be fully meshed. So
With a good ground system, say at least 30 radials at least 100 feet long, it matters very little which of the two systems you use. If there are high ground losses, the amount of top loading can aff
That was one of my normal methods of installing radials until I bought a tractor and started using a home made radial plow! Now I can bury a hundred feet of wire or coax per minute! Before having a t
Modelling is great for that. You can look at where the current is, or you can visualize it. Keep in mind there is EXACTLY the same current in the shield and the center conductor, unless the feedline
Hi All, If you do not want to learn how the sloper system works, don't read this. It is easy to see why your slopers DO work. First, you have big antennas and are on 80 meters. That means the antenna
Actually it is very difficult to not couple the unused slopers to the tower, because they are very close to the tower. I certain agree they they MIGHT not have been coupled at all, but the likelihoo
I don't recall anyone saying half-slopers NEVER "work". What everyone was pointing out is the person asking the question had a bad situation, and why his situation was bad compared to other possible
Even if the tower and yagi combination, at the feedpoint of the slopper, is not resonant the antenna can have a good SWR. All you do is change the length of the slopper, until the system is resonant
As I recall you use about 70-80% of the face width. You do not use a circular conductor the same as the face width. It is in the EZnec manual, but it has been a year since I read it. 73, Tom W8JI W8
Hi Pete! Unless I am mistaken, a change I put into the manual tells you how to handle this. To save time, here is what you do. Click over the the "Frequency Counter" mode of the analyzer. Look at the
You do not need to solder the wires where they cross, but soldering them is generally considered the BEST thing to do. The usual commercial arrangement is to run a heavy wide buss midway between the
I could have been clearer, and of course you are correct. It won't always work. What I tried to say is if REACTANCE at the tower connection point is a problem, you can cancel it by changing length o
Be VERY careful modelling different sized conductors that are joined. You can get some really weird gain figures. The windows version of EZnec provides "average gain" when you plot the pattern in "3