Re: [AMRadio] Rohn 25 base insulators and guy insulators available
Donald thanks for the heads up what's he asking for the Insulators I gave him $25 for the base insulator. That's a REAL bargain, since they sold for over $500 ea. back in 1980. I don't recall what he wants for the fibreglas insulators, but he wanted $3 each for the johnnyball strain insulators. He also mentioned $25 for the 25TG section, which is also a steal, as it cost about $90 in 1980 and I believe they sell for several hundred dollars today. I tried to send him an e-mail this afternoon but it bounced. It may have something to do with the arrl.org forwarding service, but his phone # should be ok. I know the guy is legintimate because he knew about some with some things I was privy to regarding the university radio club over 15 years ago. I suggest calling him before the stuff gets thrown out or sold to a CB'er. 73, Don _ Fretting that your Hotmail account may expire because you forgot to sign in enough? Get Hotmail Extra Storage today! http://join.msn.com/?PAGE=features/es
Re: [AMRadio] Rohn 25 base insulators and guy insulators available
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
[AMRadio] Rohn 25 base insulators and guy insulators available
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
