Karl's Tower Page

Towers are structures to hold antennas. For repeater service many towers are located on remote site. Many sites are high up in the mountains. Many mountain site are enviomentally hostile in the winter from ice and snow. Also, to install and maintain these antennas one must access the tower. Climbing gear and such skills are normally required to do this. When doing a project you'll need to cover the basics of safety, liability and local requirements (if any). These antennas work with radio equipment at sites. Many times the radio equipment has mounting challenges. This page covers these issues and more.

There was no logical place to mention tower leg angles so it will be posted, here. Two figures standardize the angle for both the legs and mounting brackets you may be purchasing; they are the ratio and angle in degrees. The former is the ratio of a unit away from the leg will give you a unit(s) in elevation. For example, 1 inch in (away from the leg towards the inside of the tower) will give you 16 inches rise in elevation, as in the case of a 16:1 angle, which is common in microwave freestanding towers. The latter is reference to straight up and down (0) Consider this when building your own brackets. There are four main angles known for commercially towers:

  • 2:1 representing a 28 angle.

  • 9:1 representing a 6.3 angle.

  • 12:1 representing a 4.8 angle.

  • 16:1 representing a 3.6 angle. (Most common)

    Hardware

    Here' a cool tool for lifting out tower sections. Beats (pun intended) pounding out a section and bending up the cross bars. A friend of mine made one (in the green) and I used that as a model to make my own. I could make more if you want to buy one to help me with my steel supplies for other amateur projects. Contact for price and availability on the "contacts" page.

    Rohn 25G notes (of course)

    Anti-Twist Bracket For the above tower type

    Cabinet notes For Motorola, GE and other brands and types.

    A rack mount bracket Inside of a cabinet taking 3 rack units

    Cavities/Duplexer Home brew from coffee cans !

    Antenna bracket For mounting on a large microwave tower

    Antenna bracket Broadcast version (Straight leg)

    Special Antenna bracket For the 1 Meter hub repeater for KBARA

    Light duty V-V bracket For smaller beams and dipoles, like the two, below

    Climbing gear and other information

    Antennas & Line

    a 3-element yagi beam antenna for 1 1/4 meters or 70 ceni-Meters Light Duty version

    a 3-element yagi beam antenna for 1 1/4 meters or 70 ceni-Meters Heavy Duty version

    A simple dipole For 1 1/4 meter band; medium rugged

    A simple dipole Same as above, except close spaced for more strenght

    A dual band unity gain antenna set For 1 1/4 and 2 meter band; medium rugged

    Repair an antenna Collinear (Station Master) type

    Build a new antenna Collinear type

    Evaluation of TeleWave's ANT450F10 Commercially made for UHF

    Evaluation of Sinclair's SC320-SF4SNM Commercially made for UHF

    A look at RF paths Where these antennas could help

    A look at Commercially made antennas Just to buy

    Hard line splicing Cheap solution


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