If you use braces as personnel safety anchorages, the TIA-222-G standard recommends a minimum brace diameter of 3/8" with a minimum weld length of one inch. TIA-222-G specifies that safety anchorages
We've heard this again and again, and it applies to this thread: Follow the manufacturer's recommendations. For Rohn 25, the manufacturer recommends 3/8" hot dip galvanized turnbuckles. Turnbuckles t
Adam, Which exact cable did you purchase from Fastenal ? tks 73 Frank W3LPL _______________________________________________ _______________________________________________ TowerTalk mailing list Towe
With all due respect; since Adam not longer has a record of his purchase and since EHS cable is not listed in the Fastenal catalog, I certainly cannot recommend that source. A common error in ham ant
Lee, There isn't anything especially difficult about controlling a rotator at a distance of 750 feet. The only issue is maintaining the required voltage for the motor, and the brake if the rotator ha
This discussion of relay reliability and switching speed is irrelevant for a relays in a phased array that should never be hot switched. The spike suppression components don't need to be outdoors, th
Tom, No, the connectors are not interchangeable. Andrew L5 connectors use a self-tapping inner contact, while V5 connectors use a captive inner contact. The VXL5 jacket diameter is slightly smaller (
John, You can find the installation instructions for many Andrew connectors including the L4PDM-C at: http://www.surpluscoax.com/Installation_Instructions_Index.html 73 Frank W3LPL -- Original messag
Brad, Greasing the gearbox as you describe is the correct approach. Its a real challenge is to keep water out of the gearbox in the long term. Remove the top half of the prop pitch housing and grease
Barry, A well designed vertical can be an excellent antenna for longer distance night time QSOs or close-in daytime ground wave QSOs on 80 and 160 meters; but its hard to beat a low, horizontally pol
John, Edmund Laport's book "Radio Antenna Engineering" contains many photos of professionally installed large curtain arrays. Figure 3.104 shows the rigging methods used to connect the feeder to the
Dan, The concept is captured succinctly here: http://www.dilbert.com/2009-03-02 73 Frank W3LPL _______________________________________________ _______________________________________________ TowerTal
Hi Pete, I agree that arrival angle statistics generated with models using isotropic antennas produce an unrealistic bias towards very low angles (much less than 5 degrees). In the real world, only o
Dan, It depends primarily on your ice and wind requirements. Full sized 40M Yagis in Duluth, MN and Miami, FL require different boom materials than the same Yagis in Yuma, AZ. At W3LPL, 3/4 inch radi
Jeremy, http://www.rohnnet.com/45g-series There are three safety issues with the guying material shown in the photo: 1. The rusty guy wire has reached the end of its safe life. 2. The three screw-in
Jim, The tubing extension will be longer than expected because of the extreme diameter difference between the tower and the tubing. You can use your favorite antenna modeling program to determine the
Gregg, I recommend not using bare copper wire alongside your tower. Copper will cause galvanizing to fail not only at the connection points, but also anywhere copper ions wash off the bare copper and
How about a new thread about crackup twoers? :) 73 Frank W3LPL -- Original message -- _______________________________________________ _______________________________________________ TowerTalk mailing
Alfredo, G4A is the designator of the 10 foot side rail of the military AB-105C/FRC tower. This tower is approximately midway between Rohn 55 and Rohn 65 in load bearing capacity. I have three 200 fo
Scott, You will have problems with inaccurate rotator position indication if you use 4 wire cable on the Orion 2800 rotator. Noise from the motor causes the position indicator to read false pulses if