I bought my rig from Champion Radio. I got the full harness (not just the belt!), I also bought three lanyards -- the fall arrest lanyard, the adjustable lanyard and the 3' rope lanyard. While you're
That depends on what you mean by "fails". Thinking about it, I can't see how the breakage of a single strap could lead to a catastrophic failure of the entire harness. Doesn't that require you to hav
Depending on the aircraft, the typical alloys you find are the garden variety 6061-T6, 2024-T3, etc. Certainly nothing more exotic than 7075-T6. 6061-T6 is the most common structural aluminum manufac
Steve didn't describe it, but a fall arrest lanyard has a portion of its length that is "gathered" in many folds. This is where the shock absorbing portion is. The instructions on my lanyard mention
I owned a 1964 Cessna 150D for almost 10 years. I was the forth owner. This aircraft had over 9300 hours on it when I sold it. Cessna publishes no maximum hour limit for this airframe. Very few parts
To continue the aircraft parallel, aircraft are designed to withstand many positive and negative Gs, as well as wind loads, so their members end up being tremendously stiff compared to antenna elemen
Somehow the math doesn't work out. 45 degrees at 50 feet should require about 90 feetof wire. For 128 feet, it must be shallower than 45 derees. What band? 40m? 80m? 160m? It seems too long for eithe
I assume your tower is set in flat ground. Thus, the tower, the antenna wire, and the ground make a large triangle. Since the angles of a triangle must sum up to 180 degrees, we have a 90 degree angl
The real irony is the next door neighbor's lawnmower or leaf blower makes a heck of a lot more noise than any airplane.... Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thous
That tower is, what? 100 feet tall? And bristles with antennas, with a 20m monobander on a TIC ring, and something else on top - 40m?. That's a big difference when trying to add a 1/4 wave sloper for
Tom, What you left out is how high above the tower top you planned to have the antenna(s). That makes all the difference. In general, I'd avoid the use of "pipe" of any kind for a structural componen
I think that over-simplifies the rule of thumb. Think of it this way -- horizontal yagi's just start to become effective at about 1/2 wavelength. Lower heights tend to distort the pattern. Heights ab
But these guys don't just put one antenna on these high towers. They load them up with yagis all driven in a stack. I'm sure these guys rarely find conditions where a SINGLE yagi above 1.5 wavelength
Me? I'm a cheapstake. I got three 1" squares of scrap .016 stainless, and some ordinary stainless hose clamps. I slip the square of stainless under the copper ground wire and tighten away. A lot chea
A big AMEN to this. I put up a modest 49.5' tower in Gwinnett County, GA. For insurance and legal purposes, I wanted to do everything "by the book". Took 1.5 days of effort to obtain a building permi
You probably don't need it. The tapered top section will do the work that a thrust bearing would. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man ever f
For the installation he specified, he doesn't NEED a thrust bearing. There's some debate about that -- given the construction of your typical Rohn thrust bearing. It does more to keep the mast straig
I seriously doubt such a material exists. If it did, it would have one rather important application -- AIRCRAFT! Airframe icing is a powerful and deadly menace. Airliners have extensive internal equi
Indeed! And if you are the typical climber with just a positioning lanyard, imagine having your feet pass through the tower as you fall backwards -- what do you do after you break your legs and are s
You can find steel shank work shoes at your local discount store. For less than $25, they look much like "sneakers". But the steel shank is very stiff, and works very well on the tower. Bill Coleman,