For low-band ops...I just posted a new Beverage article at www.w8ji.com that describes how to phase staggered or Echelon Beverages. It describes two different broadband phasing systems that can enhan
So uniques do always count? I somehow thought it was otherwise. What does a "-B" mean. I've never looked at a report and don't understand the jargon "-B". 73, Tom W8JI W8JI@contesting.com -- FAQ on
Hi Brian, I don't understand what the following means. Is something wrong? My 40 meter yagi has a 47 foot boom. Optimum stacking distance for gain is ~90 feet, depending on array mean height. Using t
Hi Tom, But that's true even when the booms are only 5 feet long with two elements, or if they are 50 feet long with three elements! As a matter of fact, it is true if they are dipoles with no boom a
Pete, You can not *easily* find the resonant frequency of your grounded tower. You could measure it by using making a clamp-on transformer to fit around the tower, but the thing would need a large co
I mig weld 2"x1"x 3/16 thk square steel tubing from the outside edge of the plate under each leg (short side flat on the plate) to the center hole, with two pieces side by side under each leg. I wel
That is not necessarily where the problem is. The guy wire can be resonant with the electrical length of the tower at the attachment point, and not even involve another guy wire. When you attach a g
As you point out, EHS and the other materials are available for much less than in the example above. My last purchase of grips was at $1.65 each, my last purchase of 502 insulators at just over $2 e
Some mention has been made of using SWR changes to look for interaction. By the time you see the slightest SWR change, you could have totally "cooked" the antenna's pattern. As ZS6EZ pointed out, it
Actually the service is too stressfull for plastic compression insulators. They would cold-flow, cut through, or simply break. I have problems with my Beverage antennas (only 14 gauge wire) and fenc
Hi Barry, What that might show is the radials and roof are almost perfectly coupled. If they were isolated, if there was a voltage difference, current would definitely flow. When there is no current
transmission line.. " When the outer conductor is not solid but is braided to give greater flexability, the attenuation in decibels per unit length due to resistance of the outer conductor is multip
Did you say if transmitting, receiving, and how much voltage you might expect to have or the frequency range?? What works well for receiving are normal DPDT dip package relays, I have many dozens in
There are dozens of off-the-shelf relays that use form-X contacts, so one would have to look through Web pages or catalogs. They are mostly power relays, and some that will easily handle 1.5kW are i
That's a nice analysis at the W4RNL site. It looks like the Hex Beam has a maximum gain of just over 3 dBd (just under 6 dBi), which is about what anyone should expect with a physically small antenn
It depends on many things, but any changes affecting loss can be tossed out because overall the loss is so low it doesn't matter. The biggest problems are mechanical and how the impedance fits into
I've never seen a case where a somewhat properly grounded strap or plate mounted to wood caused a problem. I have seen many cases where above ground-level feeders, guy wires attached to houses, towe
People ruin a lot of electrical contacts that way, including plugs and relays. Never use abrasives on plated parts,ever. It is a prime directive. Center pins on quality connectors are usually silver
I don't know what kind of welding wire he uses, but hopefully it is not the steel wire! Normal welding wire for welding ferrous metals will rust and start to disappear in a very short time when used
This is almost the same thing I now do with all my receiving antennas. I recorded the return loss on all the systems. I simply scan through the antennas (all 30 or so) and check them on one frequenc