Re: Re: [Repeater-Builder] Rohn 25g Tower
Joe is correct. One should install a tower by the manufactures spec for the details of the design were made for that installation. For free standing install as free standing. If guyed then put on guys. For towers like Rohn 25 there are a few options such as guyed or a house bracket, but always do as the manufacture specifies. One other item that must be looked at is the type of soil being installed in. There are 3 major catagories. We in Florida with the loose sand we have one of the poorest quality soil for structures. At my home one can dig a nice hole for a tower with ones fingers...no tools required. Tools do make it easier and cleaner, but the point is the soil is very loose. When looking for plans for a tower base make sure you are looking for the details about the type of soil. 73, ron, n9ee/r >From: MCH <[EMAIL PROTECTED]> >Date: 2007/07/29 Sun PM 09:17:58 CDT >To: Repeater-Builder@yahoogroups.com >Subject: Re: [Repeater-Builder] Rohn 25g Tower > >Actually, if the tower is designed to be self-supporting, anchoring it >anywhere could compromise the structural integrity. It's designed to >give some across the entire structure, and if you tie one point to a >fixed point, it will flex more at that point and eventually could fail >there - much like flexing a piece of wire in one point too much. > >Joe M. > >Jack Taylor wrote: >> >> Depending upon the wind loading on the tower, I would be cautious about >> fastening *anything* to the fascia board of a modern day house! If your >> tower >> is self supporting, design the base to handle the load. Don't rely on the >> house >> else over time you may end up with cracks in the interior walls. If the >> tower >> is to by guyed, don't use the house for an anchor :-) >> >> But on the otherhand if it is a short tower with little wind load, have at >> it! >> >> Jack - N7OO >> >> ----- Original Message - >> From: Eric Lemmon >> To: Repeater-Builder@yahoogroups.com >> Sent: Sunday, July 29, 2007 6:36 PM >> Subject: RE: [Repeater-Builder] Rohn 25g Tower >> >> Don, >> >> As others have mentioned, it is best to first attach the house bracket to >> the house, and then install the tower. >> >> I did exactly that at my house, with a 25G tower comprising two 10-foot >> sections and a 5-foot embedment section. Once I knew roughly where the >> tower would be, I put a 50-inch section of heavy aluminum channel behind the >> fascia board, and lag-bolted it to each of four roof trusses. I then >> drilled through the fascia board and the aluminum channel for several >> 3/8-inch stainless steel bolts to hold the house bracket solidly to the >> fascia board. Then I set a tower section in place to see where the hole >> needed to be, with the section perfectly plumb. Once the hole was dug per >> Rohn's foundation drawing, I added the rebar and set the embedment section >> in place with one tower section clamped into the house bracket. After >> triple-checking that the tower was plumb, I poured the concrete. Although I >> bought an electric concrete mixer from Harbor Freight just for this job, >> after going through 26 ninety-pound bags of ready-mix concrete, I was >> pooped! If I ever do this again, I am gonna hire a ready-mix truck and a >> concrete pumper to do the work. >> >> 73, Eric Lemmon WB6FLY >> >> -Original Message- >> From: Repeater-Builder@yahoogroups.com >> [mailto:[EMAIL PROTECTED] On Behalf Of Don KA9QJG >> Sent: Sunday, July 29, 2007 3:26 PM >> To: Repeater-Builder@yahoogroups.com >> Subject: [Repeater-Builder] Rohn 25g Tower >> >> On a Rohn 25g Tower that will be put on the Side of the House can anyone >> Tell Me if the Rohn House Bracket Has to be Mounted First, or can the Tower >> Be put up First. >> >> Thanks Don >> >> KA9QJG >> >> >> Yahoo! Groups Links >> >> >> > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
RE: [Repeater-Builder] Rohn 25g Tower
Nope - 190 feet, that way he doesn't have to content with FAA registry. ;-p Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com On Behalf Of Chuck Kelsey Forget the Rohn 25G and house bracket... Get a 200' Rohn SSV free-standing tower and live in a tent nearby. Chuck WB2EDV
Re: [Repeater-Builder] Rohn 25g Tower
Actually, if the tower is designed to be self-supporting, anchoring it anywhere could compromise the structural integrity. It's designed to give some across the entire structure, and if you tie one point to a fixed point, it will flex more at that point and eventually could fail there - much like flexing a piece of wire in one point too much. Joe M. Jack Taylor wrote: > > Depending upon the wind loading on the tower, I would be cautious about > fastening *anything* to the fascia board of a modern day house! If your > tower > is self supporting, design the base to handle the load. Don't rely on the > house > else over time you may end up with cracks in the interior walls. If the > tower > is to by guyed, don't use the house for an anchor :-) > > But on the otherhand if it is a short tower with little wind load, have at > it! > > Jack - N7OO > > - Original Message - > From: Eric Lemmon > To: Repeater-Builder@yahoogroups.com > Sent: Sunday, July 29, 2007 6:36 PM > Subject: RE: [Repeater-Builder] Rohn 25g Tower > > Don, > > As others have mentioned, it is best to first attach the house bracket to > the house, and then install the tower. > > I did exactly that at my house, with a 25G tower comprising two 10-foot > sections and a 5-foot embedment section. Once I knew roughly where the > tower would be, I put a 50-inch section of heavy aluminum channel behind the > fascia board, and lag-bolted it to each of four roof trusses. I then > drilled through the fascia board and the aluminum channel for several > 3/8-inch stainless steel bolts to hold the house bracket solidly to the > fascia board. Then I set a tower section in place to see where the hole > needed to be, with the section perfectly plumb. Once the hole was dug per > Rohn's foundation drawing, I added the rebar and set the embedment section > in place with one tower section clamped into the house bracket. After > triple-checking that the tower was plumb, I poured the concrete. Although I > bought an electric concrete mixer from Harbor Freight just for this job, > after going through 26 ninety-pound bags of ready-mix concrete, I was > pooped! If I ever do this again, I am gonna hire a ready-mix truck and a > concrete pumper to do the work. > > 73, Eric Lemmon WB6FLY > > -Original Message- > From: Repeater-Builder@yahoogroups.com > [mailto:[EMAIL PROTECTED] On Behalf Of Don KA9QJG > Sent: Sunday, July 29, 2007 3:26 PM > To: Repeater-Builder@yahoogroups.com > Subject: [Repeater-Builder] Rohn 25g Tower > > On a Rohn 25g Tower that will be put on the Side of the House can anyone > Tell Me if the Rohn House Bracket Has to be Mounted First, or can the Tower > Be put up First. > > Thanks Don > > KA9QJG > > > Yahoo! Groups Links > > >
Re: [Repeater-Builder] Rohn 25g Tower
On my tower we put the Rohn tower bracket through the wall of the garage. Dug the hole under the bracket. (3 or 4ft?) Stood 20 ft of the tower in the hole and then poured the concrete. 50 ft tower with bracket at 10ft (the above mentioned), then bracketed at 20ft on the 2nd story. 30ft above the house. Good Luck! Robert
Re: [Repeater-Builder] Rohn 25g Tower
I tried something a little different in fastening a house bracket. I took 2, 4 Ft lengths of 3/8" all thread rod. I welded one end of each all thread to 1/2 of a 5" X 7" X 1/4" steel purlin clip. A purlin clip is a flat soft steel plate used to join 2 red iron steel purlins. After welding, the contraption looked like an oversized fly swatter. I then drilled 2 holes in the fascia and ran the all thread from the attic outside the house thru the fascia board. Next I ran 2, 1/4" X 2 1/2" bolts thru each clip (plate against the truss) with the bolts going thru the truss and thru the clip. I used flat washers on the wood side of the truss. This allowed the all thread rods, securely fastened to the truss to go outside the fascia for attachment of the house bracket. I believe this gives a little more strength to the attachment. The tower was pretty much self supporting to begin with, but this gave an extra measure of safety. At 90 mph wind, each foot in length of the tower has 113 pounds of force exerted by the wind. This can be a formidable amount of force. Best success and 73, Steve NU5D Jack Taylor wrote: > Depending upon the wind loading on the tower, I would be cautious about > fastening *anything* to the fascia board of a modern day house! If your > tower > is self supporting, design the base to handle the load. Don't rely on the > house > else over time you may end up with cracks in the interior walls. If the > tower > is to by guyed, don't use the house for an anchor :-) > > But on the otherhand if it is a short tower with little wind load, have at > it! > > Jack - N7OO > >
Re: [Repeater-Builder] Rohn 25g Tower
>From: "Chuck Kelsey" <[EMAIL PROTECTED]> >Reply-To: Repeater-Builder@yahoogroups.com >To: >Subject: Re: [Repeater-Builder] Rohn 25g Tower >Date: Sun, 29 Jul 2007 21:53:42 -0400 > >Forget the Rohn 25G and house bracket... > >Get a 200' Rohn SSV free-standing tower and live in a tent nearby. > >Chuck >WB2EDV Or buy 30 acres and use the trees , you cant beat a rhombic . _ Advertisement: Are you paid what you're worth? Find out: SEEK Salary Centre http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fninemsn%2Eseek%2Ecom%2Eau%2Fcareer%2Dresources%2Fsalary%2Dcentre%2F%3Ftracking%3Dsk%3Ahet%3Asc%3Anine%3A0%3Ahot%3Atext&_t=764565661&_r=july07_endtext_salary&_m=EXT
Re: [Repeater-Builder] Rohn 25g Tower
Depending upon the wind loading on the tower, I would be cautious about fastening *anything* to the fascia board of a modern day house! If your tower is self supporting, design the base to handle the load. Don't rely on the house else over time you may end up with cracks in the interior walls. If the tower is to by guyed, don't use the house for an anchor :-) But on the otherhand if it is a short tower with little wind load, have at it! Jack - N7OO - Original Message - From: Eric Lemmon To: Repeater-Builder@yahoogroups.com Sent: Sunday, July 29, 2007 6:36 PM Subject: RE: [Repeater-Builder] Rohn 25g Tower Don, As others have mentioned, it is best to first attach the house bracket to the house, and then install the tower. I did exactly that at my house, with a 25G tower comprising two 10-foot sections and a 5-foot embedment section. Once I knew roughly where the tower would be, I put a 50-inch section of heavy aluminum channel behind the fascia board, and lag-bolted it to each of four roof trusses. I then drilled through the fascia board and the aluminum channel for several 3/8-inch stainless steel bolts to hold the house bracket solidly to the fascia board. Then I set a tower section in place to see where the hole needed to be, with the section perfectly plumb. Once the hole was dug per Rohn's foundation drawing, I added the rebar and set the embedment section in place with one tower section clamped into the house bracket. After triple-checking that the tower was plumb, I poured the concrete. Although I bought an electric concrete mixer from Harbor Freight just for this job, after going through 26 ninety-pound bags of ready-mix concrete, I was pooped! If I ever do this again, I am gonna hire a ready-mix truck and a concrete pumper to do the work. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Don KA9QJG Sent: Sunday, July 29, 2007 3:26 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Rohn 25g Tower On a Rohn 25g Tower that will be put on the Side of the House can anyone Tell Me if the Rohn House Bracket Has to be Mounted First, or can the Tower Be put up First. Thanks Don KA9QJG
Re: [Repeater-Builder] Rohn 25g Tower
Forget the Rohn 25G and house bracket... Get a 200' Rohn SSV free-standing tower and live in a tent nearby. Chuck WB2EDV
RE: [Repeater-Builder] Rohn 25g Tower
Don, As others have mentioned, it is best to first attach the house bracket to the house, and then install the tower. I did exactly that at my house, with a 25G tower comprising two 10-foot sections and a 5-foot embedment section. Once I knew roughly where the tower would be, I put a 50-inch section of heavy aluminum channel behind the fascia board, and lag-bolted it to each of four roof trusses. I then drilled through the fascia board and the aluminum channel for several 3/8-inch stainless steel bolts to hold the house bracket solidly to the fascia board. Then I set a tower section in place to see where the hole needed to be, with the section perfectly plumb. Once the hole was dug per Rohn's foundation drawing, I added the rebar and set the embedment section in place with one tower section clamped into the house bracket. After triple-checking that the tower was plumb, I poured the concrete. Although I bought an electric concrete mixer from Harbor Freight just for this job, after going through 26 ninety-pound bags of ready-mix concrete, I was pooped! If I ever do this again, I am gonna hire a ready-mix truck and a concrete pumper to do the work. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Don KA9QJG Sent: Sunday, July 29, 2007 3:26 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Rohn 25g Tower On a Rohn 25g Tower that will be put on the Side of the House can anyone Tell Me if the Rohn House Bracket Has to be Mounted First, or can the Tower Be put up First. Thanks Don KA9QJG
RE: [Repeater-Builder] Rohn 25g Tower
If your life is in perspective, you build the tower first. Then you attach the brackets to the tower. Then you build the house. Bill - W6CBS At 06:25 PM 7/29/2007, you wrote: >On a Rohn 25g Tower that will be put on the Side of the House can >anyone Tell Me if the Rohn House Bracket Has to be Mounted First, or >can the Tower Be put up First. > > > >Thanks Don > > >KA9QJG > BEGIN:VCARD VERSION:2.1 N:;W6CBS FN:W6CBS ORG:Hudson Sports Productions TITLE:Broadcast Engineer TEL;WORK;VOICE:1-650-595-5566 TEL;PREF:1-650-595-5566 ADR;WORK:;1-650-595-5566;P O Box 7143;San Carlos;California;94070;USA LABEL;WORK;ENCODING=QUOTED-PRINTABLE:1-650-595-5566=0D=0AP O Box 7143=0D=0ASan Carlos, California 94070=0D=0AUSA EMAIL;PREF;INTERNET:[EMAIL PROTECTED] REV:20060508T165031Z END:VCARD
RE: [Repeater-Builder] Rohn 25g Tower
I should have thought mounting the brkt is better , all to easy to mount after and discover you need to grind or shim. (unless you can measure ferpectly ) >From: "Don KA9QJG" <[EMAIL PROTECTED]> >Reply-To: Repeater-Builder@yahoogroups.com >To: >Subject: [Repeater-Builder] Rohn 25g Tower >Date: Sun, 29 Jul 2007 17:25:32 -0500 > >On a Rohn 25g Tower that will be put on the Side of the House can anyone >Tell Me if the Rohn House Bracket Has to be Mounted First, or can the Tower >Be put up First. > > > >Thanks Don > > > >KA9QJG _ Advertisement: Are you paid what you're worth? Find out: SEEK Salary Centre http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fninemsn%2Eseek%2Ecom%2Eau%2Fcareer%2Dresources%2Fsalary%2Dcentre%2F%3Ftracking%3Dsk%3Ahet%3Asc%3Anine%3A0%3Ahot%3Atext&_t=764565661&_r=july07_endtext_salary&_m=EXT
Re: [Repeater-Builder] Rohn 25g Tower
I guess as long as you are spaced correctly it could be added afterwards, but I would do it first to make life simplergetting boring bits around the tower leg would be more annoying than it is worth... If you have the tower up, deal with it but if you have a choice :-)... just measure carefully so everything lines up correctly... The house bracket will hold everything straight while the concrete sets if you do it right mount the brackets and drop plumb lines to figure out exactly where the tower hole/pad/concrete needs to bea crooked tower will never fix itself Doug KD8B At 06:25 PM 7/29/2007, you wrote: >On a Rohn 25g Tower that will be put on the Side of the House can >anyone Tell Me if the Rohn House Bracket Has to be Mounted First, or >can the Tower Be put up First. > > > >Thanks Don > > >KA9QJG > <>
RE: [Repeater-Builder] Rohn 25g Tower
I think the idea is you want the legs of the tower to extend below the concrete into mother earth to keep lightning from arcing ( or trying to) through the concrete on the bottom if it gets a direct strike... Then add the appropriate grounding rods outside the concrete and it will not likely ever explode... the concrete is an anchor this way, not an insulator.. The ROHN installation notes have specific instructions they recommended as I recall... Doug KD8B At 06:53 PM 7/29/2007, you wrote: > > >Thanks everyone for the Fast answer. I thought >it was adjustable, I have Heard if You Sink a >Tower in the Ground 4-8 Ft With rebar and Pour >the Concrete If Lighting Strikes the Tower it >Can Explode in the Concrete even if You do put >out Ground Wires at the Base. And the Tower will >corrode Faster and the Galva -ionization will be >ate away. Have No Idea if thatâs True But >That what I wish to do., At 60 If it Last 10 Yrs I will be Happy . > > > >Thanks Don > > >KA9QJG > > <>
RE: [Repeater-Builder] Rohn 25g Tower
Thanks everyone for the Fast answer. I thought it was adjustable, I have Heard if You Sink a Tower in the Ground 4-8 Ft With rebar and Pour the Concrete If Lighting Strikes the Tower it Can Explode in the Concrete even if You do put out Ground Wires at the Base. And the Tower will corrode Faster and the Galva -ionization will be ate away. Have No Idea if that’s True But That what I wish to do., At 60 If it Last 10 Yrs I will be Happy . Thanks Don KA9QJG
Re: [Repeater-Builder] Rohn 25g Tower
Don, It probably depends on which bracket you use. Ones that I have used they come in verious sizes/distant from house/mount and are adjustable. The bracket forms a U shape (with sharp corners) and a piece goes between the U that can be moved in and out. I prefer to dig hole, put at least 3 pieces of tower up and clamp bracket. I don't think bracket is continous, but holes in it for the cross peice so can adjust at about 1" intervals. Once up line up tower and get in place where you want it and then pour base. Then stack the rest of the tower if going higher. 73, ron, n9ee/r >From: Don KA9QJG <[EMAIL PROTECTED]> >Date: 2007/07/29 Sun PM 05:25:32 CDT >To: Repeater-Builder@yahoogroups.com >Subject: [Repeater-Builder] Rohn 25g Tower > > >On a Rohn 25g Tower that will be put on the Side of the House can anyone Tell >Me if the Rohn House Bracket Has to be Mounted First, or can the Tower  Be >put up First. > >Thanks Don > KA9QJG Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
RE: [Repeater-Builder] Rohn 25g Tower
Don, I put up my tower first, then mounted the bracket and affixed the tower to it - THEN poured the concrete base. (I buried 4' of tower.) Makes certain the tower it straight that way! Mark - N9WYS Disclaimer: Not affiliated with any other N9WYS that you may know or might ever have know. Your mileage may vary. "I" before "E" except after "C." Batteries not included. Some assembly required. Void where prohibited by law. That number again is: 800-328-7448; call now, operators are standing by! Objects in mirror are closer than they appear. The call is coming from inside the house. Consult your attorney and accountant for your individual tax situation. Righty-tighty, lefty-loosey. Do not recharge, put in fire or disassemble. Employees must wash hands before returning to work. It's ALWAYS the red wire (unless it's the black wire). Copyright C 2007, N9WYS. All Rights Reserved Worldwide. _ From: Repeater-Builder@yahoogroups.com On Behalf Of Don KA9QJG On a Rohn 25g Tower that will be put on the Side of the House can anyone Tell Me if the Rohn House Bracket Has to be Mounted First, or can the Tower Be put up First. Thanks Don KA9QJG
