My experience is as follows: I have a full-sized Inv Vee for 80m, fed with 600 Ohm Ladder Line, and through a Tuner w/balun (apex at 70' and ends up 12'). My other antenna is a Create CD-75 Rotatable
a 3'-6' rigid rope type, or a 3'-6' bungee type....and where you hook to... like the hook 7" below your neck [on the newer full fall arrest harness]. In the old 1976 Roh catalog, they had the same th
The video has certainly generated a lot of talk, some valuable. Does anyone use a belay? A competent groundie could keep a line snug as you go up and down, saving you the trouble of all that hooking.
If you're 55+, using a ladder seems to have a lot of risk. http://apha.confex.com/apha/135am/recordingredirect.cgi/id/17261 (you can click on a pdf link there) in this study: (workplace fatalies) Rel
that would of course require either an installed line, which i would not trust due to weather and wear issues... or someone to climb up to attach it before it was used each time, kind of defeats the
any towers are rated to handle 5000 lbs...none of em ! It's a moot point though. Other than yourself and VE6JY, I don't know of any other ham towers with any kind of fall arrest system. tower's. " do
Does anybody know how much oil is required in the gear box, for the UST HDX-689 / HDX-5106 motorized crank up towers ? It a BIG gear box. I'm guessing 4 x quarts at least. It's a worm gear that float
rail or a 3/8" safety cable, that the 2 x fellow's could hook onto ?? I didn't. I didn't see a safety cable on either the 1st 100' they climbed, nor the 60' of the actual ant array. Even if the tower
My antennas are mostly up 100-120 ft in redwoods, douglas fir, and madrones. I have had multiple failures of flex-weave in antennas hung in trees and hung from towers. Indeed, virtually every antenna
It's called 100% TIE OFF! The tower owner didn't tell them to "free climb". You are right on one thing. They could have walked away from the job if they didn't want to go up the 100% tie off way. ins
I?ve used my bow &arrow, spinning reel, and parachute cord to get the supports up, and have until this past week just tied the antennas up with enough sag to compensate for the wind. When I put up th
Allen: What happens is that the strength of the reinforcing bar in the head affected zone of the weld is reduced by 50%. This is why you do not weld normal A615 reinforcing bars. If you absolutely ha
Kathy, Pop rivets work very well. That is what I would recommend at every joint - even in addition to the hose clamps. Stan, K5GO industrial supply place. What you don't want is the rivets that have
If you look at the construction of most rebar cages it appears the cage does little. It's the individual sections of rebar, their shape, and overlap. IOW the cage is there to keep the concrete from l
As do I, but they will also work with properly swaged and fitted elements. I think you will find the piece that fits into the tool (I've forgotten the name of it) has barbed like edges, almost like a
And just how do you think they do a "double make" contact? :) Bridge the two armature contacts on a dpdt or dpst relay and you get a double make spdt or spst. contactor. It's 2 sets of contacts IN SE
And further, if you don't let the housing breathe, that condensation can accumulate and eventually fill it with water. Trying to seal a box like that will never prevent vapor laden atmosphere from en
The UST HDX-689 is still sitting in the driveway, blocked up, horizontal. I have a cracked flange on one of the drum bearings, that will require a gear puller to get the large chain sprocket off 1st.
<snip> Can't find anything on the UST Web site about an HDX-689 -- only a 589. Is yours an older model? A custom model? 73 Alan NV8A numbering scheme is the 1st digit is the number of the top section