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1-6 of 6 messages
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Rohn Telescoping Masts
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by VA3DJL on September 2, 2000
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I am looking at purchasing a Rohn telescoping mast. I would love to chat with someone as to their thoughts
on the ease (or not) of putting them up. Antenna support capabilities and guying etc.....
Thanks,
Don
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RE: Rohn Telescoping Masts
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by KK5IB on September 15, 2000
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Don,
I have two Rohn push-up masts in use. The first one was a
40' one, attached to house corner at 12', and had two sets of 4 guy wires. Reason for 4 was ease of attachments, not any better than 3. South set of guy wires was attached to fascia board at peak of house, single story rancher. The mast had a 80 meter inverted vee attached. A strong puff of wind pulled the short tv-type guy screw eye out and the mast came down. I cut the bent section out, and am using the 25' section on the end of the house. Replaced the 40 footer with a 50' HD, same location but now 3 sets of guy wires and steel bracket with long lag screws in place of short screw eye. Also added more and heavier screw eyes, not of tv antenna type. Still have 80 meter inverted vee on antenna, which is about 40' up, not quite full length. I have steel guy wire on bottom set of guys and braided dacron, black, on top two sets of guys. Also have 8 guy attachment points instead of 4. The guy rings have steel thimbles to avoid the guy rings cutting the dacron. I have a steel right angle bracket, a shelf support bracket, at the top that supports a small pulley. The bracket gets the antenna a foot or so away from the metal. The bracket is held to the pole with stainless steel hose clamps. The new pole has withstood some very severe storms including a hail storm with hail the size of softballs and baseballs. Totaled one car, with $5600 damage to another, but the antennas stayed up. There was grass and mud up under the eves of the house splashed there by the hailstones hitting the ground. Also longer pole is attached to the house in a corner of the construction so that the two mounting brackets are 90 degrees to each other. When the first antenna came down those brackets stayed and the first pole bent at that place, but the brackets held firm. The dacron in the top 2 sets of guys is 3/16". Hope this is of interest.
73,
Darryl, KK5IB
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RE: Rohn Telescoping Masts
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by K3UOD on September 18, 2000
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Not familiar with the Rohn. I have a Radio Shack 36' telescoping mast as center support for my 80M vee.
The bottom fits nicely inside a 5 ft. long 2 in. water pipe I have set in concrete. Four feet of the 2 in. pipe is under ground. I drilled through the pipe 1 ft from the bottom and inserted a 3/8 in bolt through the pipe so the bottom of the mast doesn't rest in the water at the bottom of the hole. This arrangement leaves 33 ft. of mast above the ground. I also put gravel in the bottom of the hole to improve drainage. I used a rubber pipe union with hose clamps to seal the joint between the mast and the pipe. That also keeps the mast from rotating.
I can insert the collapsed mast into the pipe single-handed no problem. Then I stand on a step ladder and raise the mast sections one at a time. It's easy.
I don't use any guys since the load is pretty light. If I were going to put a beam up there I'd definitely guy.
Hope this helps.
73, Jerry
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RE: Rohn Telescoping Masts
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by N4VI on September 23, 2000
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The May 1994 issue of QST has an article by Bob Haviland, W4MB regarding the use of Telescoping masts. It discusses loads, guying and the weaknesses of the masts themselves (cotter pin). Check it out.
73's
chris, n4vi
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RE: Rohn Telescoping Masts
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by K9UW on December 5, 2000
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Several years ago, I went to Radio Shack and bought one of their 30 foot telescoping masts. Imagine my surprise when I found that it was manufactured by Rohn! The Rohn adhesive sticker was on the mast, so I'm assuming that they actually made it. Mine serves in a somewhat unusual environment - it extends ABOVE my tower. My tower mast is a heavy duty (schedule 40) stainless steel steam pipe, with a 10' section of the stuff set into the rotor and about 6' extending above the tower. My tribander is attached to the heavy duty pipe. The telescoping mast fits perfectly inside the steam pipe, and I have it pinned with two AN bolts. The mast reaches the 80' level and I have my 160 meter inverted vee attached at the top.
Good luck with yours!
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RE: Rohn Telescoping Masts
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by VA3BRR on January 13, 2002
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Don this mast better be easier than the last one hihi. Or count me out. Just for those reading this forum VA3DJLs last telescoping mast was a huge 70' that never got fully extended except when laying on the ground. It sure made a nice decoration for my garage floor though where it was stored for sometime. An easy one to put up would be nice though. Talk to you soon,
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