A 10 inch difference in turning radius between a 12' and 16' boom three element antenna isn't significant ... not with a turning radius in the 19' range. I don't think the 2' 3" difference in betwee
Except the 0 degree port and the 180 degree port are actually connected in parallel (the 180 degree port is connected to the zero degree port through a phase reversal transformer/un-un). Thus, you h
Actually, there is enough information in ON4UN's book for a competent individual to build a hybrid style (quadrature) phasing unit without much more than an MFJ-259B. Of course a good scope and curr
There seem to be a couple of advantages to a crank-up here in hurricane country ... it seems like most of the antennas on crank-ups survived the recent triple threat (they were down at 20' or so) wh
The SteppIR elements are all insulated from the boom. As such, unless your antenna switch shorts all unused antennas to ground, the only contribution to top loading is from one side of the driven el
You are not going to be able to meet those requirements with Rohn 25. The old data I have (1988) shows no capacity at 90 MPH with any more than 14 feet above the top house bracket. Even at 70 MPH, 34
Rohn's book (drawing A871266 dated 9/24/1987) shows the limit of 5.7 sq ft at 35 feet for 90 mph and 1/2" ice. The tower is freestanding to 45 feet with NO ANTENNAS under the same conditions. Rohn S
Jim, Look at LMR400DB (direct burial) ... it is "flooded" with a sealing compound that will keep water from wicking. The stuff is very "sticky" and the critters don't like it <G>. 73, ... Joe, K4IK _
Jim, There is a process, although I do not have the particulars, to have that record corrected. Check with your state insurance department. This has been an issue recently in Florida due to coverage
Move it ... if you don't and you have any problem you will regret it. It will also be difficult to put either a section of tower in the base (Rohn 25/45/55) and/or install a prebuilt rebar cage with
Get rig of the 'original' at the end ... use http://www.qsl.net/ve6wz/intro.htm 73, ... Joe, K4IK _______________________________________________ See: http://www.mscomputer.com for "Self Supporting T
David, The 12/1/2004 and 1/1/2005 mailings both triggered the RBL. The mailing list manager for Contesting.com notified the administrators for all contesting.com lists (I manage two lists) in the las
I have contacted ARRL and geo888@cs.com is not something they forward to. Because the monthly e-mail reminders were causing contesting.com to be blacklisted, they have been suspended. That option is
All this back-and-forth is way off topic but I've reached the tipping point and need to sound off ... TowerTalk is not a Champion Radio support forum and is not funded by Champion Radio. The individu
Bill, "Get real," yourself. This reached the reflector due to the the banning of a formerly active reflector participant by Steve. The dispute did not reach the reflector until Steve chose to ban the
OK, here's a toss up that should generate some real discussion: Rohn 45 and Rohn 55 have essentially the same face width and the same cross bracing. The Rohn 55 has slightly thicker wall side rails -
3 guages of wall thickness (11 vs. 14), 1.5" diameter vs. 1.25" diameter and 95# per section vs 70# per section... The additional ultimate strength is fine if one is looking for maximum load at maxim
The Rohn Commercial Catalog (11993) gives the following allowable antenna areas for Rohn 65 at 80 MPH (Prince Georges Co. is 75 MPH zone): Ht. no ice 1/2" ice 50' 19.7 19.1 60' 9.4 4.1 Note 3: Desig
Some very good ideas here: http://www.iol.ie/~bravo/remote.htm 73, ... Joe, K4IK _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireles
Still easier, find a flexible plumbing coupler ... Home Depot locally has them in 2" to 3" (and 2" to 4"). Slide the 2" end down over the mast leaving the "wide" end down over the "pointy top" of th