Yes and no. Originally, yes, but I've gone and switched out to an air variable as an experiment, and the problem remains. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousa
No. Yup. OK. I've considered this possibility, even to the point of possibly winding a new coil just for 80m. I'm seeing about 200 pf on 80m on the shunt, and around 600 pf on 160m. What value series
The "broadbandedness" of the double bazooka probably comes more from the additional loss of the coax than from any increase in the size of the conductor. If you consider the size of 12 gauge wire or
Yup, this will make the dipole more broadbanded, because it simulates a single element of the same diameter. No, with multiple wires there isn't an added loss. Bill Coleman, AA4LR, PP-ASEL Mail: aa4l
The BEST way is to use a ladder or bucket truck, so you don't have to climb it at all. Even blocked, a crankup tower is exceedingly dangerous to climb. Best advice is not to climb it at all. Bill Col
While you might be able to get away with lag bolts at the 10 foot level into the rim joist, you are going to need carriage bolts through the header into the brackets. You don't need any section that
How tall a mast are we talking about? How much is going to be in the tower and how much outside? Champion Radio has a mast stress program on their site. You should compute how much mast you need and
Last October, I put the similar A743 kit on my A3S. I have not seen this "narrowing" of 20m. The 20m SWR curves are much the same as before. The 40m has a rather narrow SWR bandwidth by itself, but i
You don't mix sand into concrete. Concrete is a mix of a filler material, known as an aggregate, and cement. The aggregate is usually a gravel or other rock. Sand helps to fill the spaces between the
Does your rotator break down that often? For what they do, rotators are pretty rugged pieces of equipment. If yours is constantly breaking, perhaps you need to move to a larger rotator? What maintena
uh, 2' by 2' by 4' deep. About .7 yard of concrete. Rohn 25 is self-supporting up to a very short height, depending on the wind load. I don't have my catalog handy, but at 70 mph, it's about 30-35 fe
Doesn't Rohn 45 require a larger tower base than Rohn 25? Isn't the standard Rohn 25 base 2 feet square, whereas Rohn 45 is more like 2.5 feet square? This would seem to be a difficult conversion, un
Sounds like a crane might have been a better idea. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 ___________________
Bingo. Don't worry about the wire size too much. So long as the wires are big enough not to break, they should be fine. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand
Considering how many times this scenario has played out and resulted in an airport closure, it is a relief to hear that a judge finally ruled correctly.... Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@ar
The copper alloy pennies are about 2.6 grams and ring nicely when dropped (like a bell). The copper-coated zinc pennies are 3.1 grams and land with a dull thunk when dropped. Curiously, you can't tel
My catalog (from 2000, I think), clearly states "As a guyed structure, [Rohn] 25G can rise to a maximum height of 190 feet. Selfsupporting and bracketed heights depend on loading are also specified i
It's actually worse than that, Roger. If a municipality accepts FAA money, then they have to agree to operate the airport for a long period of time (typically 20-25 years). It carries the stipulation
According to Rohn, 45G can hold up 5.1 square feet 40 feet high in 70 mph winds. That seems like plenty for a small tribander. (My A3S w/ A743 is 5 square feet) Temporary guys might be a good idea wh
Yeah, but unfortunately Chicago never accepted FAA funds to do improvements to Meigs field. However, Daley did go back on a promise he had made with an Illinois congressman, as well as do the deed in