Donald thanks for the heads up what's he asking for the Insulators Neal-Ka2caf active on 160 with collins 300g,gates BC-1H1,RCA BTA 500R and 1R1
Donald Chester wrote: > In case anyone is interested in constructing a series fed vertical antenna > using a Rohn 25 tower as radiator, I came across a source of components at a > hamfest this morning, at very reasonable prices. > > Two AM broadcast tower base insulators, specifically designed to fit the > Rohn 25 are available. (He had three, but I purchased one to keep as a spare > for my own 25G tower). The insulators are real glazed porcelaine, 4" in > diameter, 7" tall, with cast steel end bells and base plates, all of which > are hot-dip galvanised. They are designed to bolt directly onto the Rohn > 25TG tapered base section. An adaptor plate could be constructed for use > with a conventional 25G section. > > There is one Rohn 25TG tower section sitll available. If not purchased soon, > a local ham may use it on his tower by burying the bottom of the base > section in concrete, conventional ham radio style. There were originally > three others, but they have already been sold, and may have met similar > fate. The 25TG consists of a normal 25G section but the bottom couple of > feet of the tower legs are bent inwards to a taper, like the point on a > pencil, and welded onto a 5/8" thick round steel plate approximately 10" in > diameter. The plate has 3 holes for bolting onto the base insulator. The > tapered part of the tower legs is reinforced with solid steel sheet metal > instead of the normal zig-zag steel rods. One of the insulators described > above was used with this tower section. > > There are about 60 rigid fibreglas insulators designed to attach the guy > wires to the tower, with a 10,000 lbs breaking-strength rating stamped on > each. This provides a long insulative path between the metallic guy wire and > the vertical radiator. They are designed to also serve as torque arms for > the guy wires, to reduce the possiblity that the tower might rotate during a > severe storm. > > There are "hundreds" of #502 "johhnyball" strain insulators taken from the > the guy wires. The vendor said they were attached using u-bolt cable clamps, > and that the guy wires were hurriedly cut apart using a bolt-cuttor, with > the wire-ends and clamps still attached to many of the insulators. > > An AM broadcast station used this material in a four-tower directional > array, but discontinued their nighttime directional service because it was a > money loser, so they gave the towers and hardware to the local ham club in > exchange for taking them down. The array was originally built iabout 1980, > so the stuff is relatively new as used disassembled tower material usually > goes. Members of the club divided up the 25G tower sections, but had no use > for the insulator hardware, and no-one seems interested in using the > remaining 25TG section to build a base insulated tower. > > The material is located in Murray, KY. Contact Bill Call, KJ4W. His phone # > is (270) 753-7870. His e-mail address is: [EMAIL PROTECTED] > > I would like for some 160m AM'ers to get this material and construct some > new no-compromise series-fed verticals. > > Don K4KYV > > _________________________________________________________________ > Surf and talk on the phone at the same time with broadband Internet access. > Get high-speed for as low as $29.95/month (depending on the local service > providers in your area). https://broadband.msn.com > > _______________________________________________ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio
