Hello, Mike; The other responses I see are correct; the balcony must be capable of safely supporting the weight of the tower and equipment plus any other load that may be on it. The concrete structur
Hi, Dave; The volume you propose, 5 X 5 X 3, is more than adequate. It will resist much more overturning moment than the 4 X 4 X 4. Put a rebar cage in the concrete. Next problem: can you get the con
Hello, Bill and all; Dave Leeson's book, "Physical Properties of Yagi Antennas," shows how to calculate wind forces and strength (bending and tensile) of all the cylindrical members involved, includi
A high percentage of the energy in a lightning strike is in the spectrum under 1 MHz. I don't think tying knots in the line will impede it much. 73 de WO?W
Hello, again; In days of old, before everything had electronic components, the threshold voltage above which appliances were damaged was quite high and the threshold for the power cords was, in some
For 15 years I've used a 35' mast of R-S steel sections supported in one plane by the elements of an inverted Vee and in a perpendicular plane by guys at about the 2/3 height of the mast. I can put t
Hi Bud and all; My answer to this problem was to cut 6" lengths of #12 wire (fence brace wire, light duty, from a farm supply store) and bend a small "U" at one end of each piece. I didn't try to str
I recently purchased a copy of the book from Ham Radio Outlet. It covers lots of material related to loading towers, masts, and rotators, also. 73 de WO?W
Hi, Jerry; Comments follow. The size base needed depends upon the load it must carry. What height tower; what mast above it; what is wind load of tower, rotator, mast, antennas, and anything else tha
If you replace coax in an antenna, be sure to understand that velocity factor may be critical to proper antenna operation, if the coax is serving as a phasing element. When you change to a different
I tilt my 60 foot Universal, with a rotator, 16' mast, tri-bander, and a VHF antenna. I cast two pieces of steel, 1/2" X 2" X 1' and 2' apart into the base. A gin pole (I don't know what to call it)
Hi, Jim; Yes, two verticals can share radials. See "The W2FMI 20-meter Vertical Beam," Jerry Sevick, in June 72 QST. For just two verticals, start with one radial between the two, Add the rest of the
Hi, Tim; Be sure to calculate loads on the house. A tower can crack plaster. I tall tower, more than 45', can 'work' the structure and weaken it. It is advisable to consider adding bracing to carry t
Use multiple wires, cemented to circumference, ID or OD, to create a 'cage' to broaden the bandwidth. I have three antennas, up to 58', that I use for field day, made of telescoped 3" and 2" aluminum
An advantage of this is that you can accurately dig straight sides to the desired dimensions for that first foot. Then, if you choose to bring in someone with equipment, you have given that person an
BlankA virus has been passed to me by an email that I received from a friend recently. My computer in turn was affected. Since you are in my address book there is a good chance you will find it in yo