Not true at all. The sequential baths at the galvanizer's plant include an acid dip that takes off all rust and active metals like previous zinc plating. Of course, if you leave it in long enough, i
FOR SALE - new DX Engineering DXE-ARAV-1P Active Vertical Receive Antenna. Never installed; all of the mounting hardware is still sealed in the original poly bag. $199, plus shipping. 73, geo - n4ua
Nick, Good luck on finding good old zinc chromate primer (the pale yellow stuff); I haven't seen it in quite a few years - the chromate part doomed it. It was replaced by zinc phosphate, which is pre
Dunno, but this seems like something you ought to know. I think 1 degree vertical error would put the top of your 97' tower about 1.7' out of plumb. 73, geo - n4ua -- This message is for the designa
I measured one of their ICE 303 units years ago, and the inductor was 44 uH. 73, geo - n4ua waveform -- This message is for the designated recipient only and may contain privileged, proprietary, or o
I designed one of the drive shaft couplers into my rotator system, based on the suggestion in Dave Leeson's Yagi book. Mine was intended for a BMW 1600, I think, and was bought off of the auction sit
Rick, Mine is mounted about 5" above the rotator, in the same aluminum "doghouse" that houses the selsyn and the limit switches, so it's relatively protected from the elements. Yep, it's on a prop pi
I usually find a piece of tubing, aluminum preferably, with about the right wall thickness and diameter in the ball park, cut a 2" length or so, and thin slit it in half lengthwise to make a shim. Yo
There is a class of stainless cable hoisting grips that are similar to the Kellems, but they are open on the side, and you lace them up around the cable(s) with a provided stainless braided cable (ab
Go to: http://web1.automationdirect.com/adc/SiteMap/SiteMap and find the equivalent or better switch. It will be less expensive. 73, geo - n4ua -- This message is for the designated recipient only an
Rob, I don't know if anyone answered your question but, for the case you're describing, it just doesn't matter. You are on the right track when you started wondering about the small size of the plate
Well, that's one way to open up a thimble, but a little too Neanderthal for my tastes ;-) I usually capture one half of the thimble in a vise, with the long dimension horizontal, and the thimble open
The tallest, one-piece tower I have been associated with was a 70' triangular self-supporter, about 4 feet on a side at the base. Back in the '70s, I lived outside Philly, in Lansdale, PA, and I was
Speaking of hardware, do any of you Philly guys know if J Schmidt hardware is still in business? I think he is/was in Harleysville, but the web site has been down for a while. He was a great source f
The small p-p gearboxes are closer to 10k:1, and I presume the large are about the same. I would not have thought you could ever back-drive a p-p, but I believe Gerald. That motor must have been LOUD
OK, a little more information on this thread: One, when you take steel to the hot-dip galvanizers, the work is staged through a series of vats. The first usually cleans dirt and oil off, the second i
It's a good idea if the leg wall is thick enough (and I don't know the definition of thick enough)- I've seen it often on commercial towers. BUT, I'm pretty sure Rohn 25/45 is way too thin for this.
Paul, Do you remember the boom length and the element diameters? It would be an interesting exercise to model a Gotham exactly the way their instructions said, and see what the results are. Back in t
Philly is larger diameter, so it doesn't usually fit in the notches in the gage. However, you will (should) have an EHS leader at the turn-buckle end of the guy, so you will measure tension on that.
Then this advice won't apply to you, I guess. 73, geo - n4ua the the in wires wires to ________________________________________________________________________ -- -- -- -- -- This message is for the