I'm trying to clear up a point of my own confusion and/or ignorance w.r.t. "thrust bearings." I used to think that the "thrust" taken up by the bearing, e.g. when supporting an antenna mast, was a ve
The purpose of a thrust bearing is to support the side loading on a mast, so it does not reach the rotator, which is not designed for side (or shear) loads. Hope this helps. Brian KE6IYC ____________
Paul, I inquired directly to Rohn for a definitive answer to this pesky question. Contrary to the definition of "thrust bearing" that appears in other sources, Rohn says their TB series are meant onl
Sherwin-Williams "Metalatex" AM stations use it, works good. Available in any color. Brian KE6IYC _______________________________________________ _______________________________________________ Tower
Being a transmitter engineer for Fox television, Los Angeles (CA), I can tell you unequivocly YES, they can be an issue. What you need to know are the RF channel, Power level (ERP), and distance (dir
length (in inches) times OD of pipe (in inches) divided by 144 (square inches in a square foot) = square feet of wind load 3 1/3 sq. ft. for the 20' of 2" OD Brian KE6IYC ____________________________
We've borrowed an RC2800px rotator for a field day like activity, and we don't know how to change the rotation limit -- currently seems to be set to 325 degrees. I searched for a manual on line, to n
I have an US Tower HDX-89 tower, and I need to replace the Tailtwister 2 currently nestled in the top section below the thrust bearing. Is it possible, and what's the procedure, to remove and reinsta
Thanks everyone for your suggestions. I'll likely be doing this (if the weather holds) over the next week or so & I'll take some pictures and post a link to them. An Orion 2800 is replacing the Tailt
Thanks to everyone who replied on and off the list; I put the tower up to where I could get the rotator out, and carefully chocked the tower; I removed the old rotator, and put in the new one. I like
I went outside today to elevate my 2004 vintage US Tower HDX 589, and smelled oil around the tower. It appears the Hub City reducing gearbox is leaking oil via the input shaft bearing seal. I'm not s
You would think this simple antenna should give one no problems. Wrong. Maybe some expert here can help solve this problem. Unfortunately I can mount it only up 22' on a chimney mount. Currently fed
Thanks to personal replies from several of you, a satisfactory solution has been found. Adjusting the Y dimension outward 1" was the answer. It moved the 10M band SWR curve to a resonance at 28.000 b
Guys, I have various pieces op phyllistrad and wish to use it for boom support and other purposes. Need to know the proper size U clamps for: T1200 HPTG 2100I HPTG 4000I I haven't had any luck determ
Thanks info guys. Having an interesting time determining clamp size for T1200. It has an OD of .17". It seems that an 1/8" (.125") clamp would be too small. That leaves only 5/32" (.156") clamps if t
Hi Jay, That's it. Many years ago I installed a Glenn Martin 70' aluminum tower which used 4000I philly and used cable clamps. Perhaps it was wrong engineering but the tower stayed up. No doubt being
I am putting up a 1/4 wave insulated tower for 160. I plan on guying it at 5 levels. Since I am not putting any antennas on the tower, what are your thoughts using the Phillystran HPTG 2100i or shoul
Here's my take on this. Unfortunately coax has to really bad to tell that it is with the usual instruments available to most of us. One is generally trying to measure losses in the <1 to maybe 1.5 db
I ran into this here. What he wanted was in direct contradiction to the engineering specs regarding the rebar cage. Solution. Get it signed off, quickly put it back to Rohn spec and backup the cement
Question: None of the tower sections are Cadwelded. They are bolted together. How is it that these bolts make an adequate lightning connection but one "has" to Cadweld the ground wire to the tower at