Drilling holes in tubular tower legs at the base doesn't appear to me as a manufacturer-recommended practice. Holes in tube walls reduce the ability to tolerate stress/shear. -- Eric K3NA An excellen
My comments: 1) 2" PVC is too small. Get a large diameter sewer pipe (this can be in the order of 12" inside diameter). Since you said the tower is 3 feet from the house, you don't have to go far. 2)
I have been told that another consideration for "shallow" grounds is freezing. Ground rods extending below the frost level will work better when the top layers of soil are frozen than rods which rema
One point which Hank made has been unappreciated. Wind is not a laminar flow of air. It is highly turbulent at the scale we are dealing with. None of the calculations we are talking about have much t
An ordinary Excel spreadsheet will do these kinds of calculations. Look up mathematical functions in the Help files. -- Eric K3NA Hi, I was wondering if anyone has any software or knows where to find
Buy the book "Antenna Zoning" from ARRL, just published in the last few months. It is written by K1VR, an expert in this field. It will cover ALL of your questions, plus many others that you have not
The use of "3-bolt clamps", the flat plate system that Tom mentions in the second paragraph below, should be avoided. These clamps need to be checked regularly for proper bolt tension. We have had se
Hello everyone -- I'm sure this problem has been solved effectively before. I'm looking for suggestions for effective techniques. PROBLEM: 1., When transmitting, RF disrupts my computer-to-radio keyi
1. Aluminum vs. steel My recollection from a materials engineering course long ago was that aluminum and steel are different in how they handle cyclical loads. With aluminum, the yield strength gradu
WBR70 brings back a lot of memories. WBR70 was used to transmit meteorological data on teletype around the Caribbean. As a young boy who intended to major in meteorology in college, I used to copy th
I was actually wondering about this arrangement the other night. Has anyone tried it in the field or with NEC4? -- Eric R3/K3NA Greetings Gang; I have been following the discussion of counterpoise sy
Hi folks -- Anyone had trouble with radials on/in ground that periodically freezes? For example, if one buries radials ~5-10cm below the surface of the soil, and the soil cycles through freezing and
I'm looking for specific information which compares the level of precipitation static on folded vs unfolded antennas (preferably verticals). Is anyone aware of published literature which, for example
Here is a summary of responses on this question. No particular order to responses. No one reported any problems with frost heaves. W1DXH: -- Anchors with clothespins and doll pins, driven in with a h
I'm looking for specific information which compares the level of precipitation static on folded vs unfolded antennas (preferably verticals). Is anyone aware of published literature which, for example
BBC World Service did an interview with a woman from US Fish and Wildlife Service about bird kills at communication towers. It was short, a few minutes, about 25 minutes after the start of the "Outlo
A while back Ian G3SEK mentioned in a posting: Absolutely - even in slick plastic rope after years of use, figure-ofeight knots still don't even think about coming loose. They have the advantages of
Hi Ted -- Thanks for those references. Nonetheless, it's an excellent knot to know. I'll be substituting this for bowlines in the future. So much to learn... -- Eric K3NA --Original Message-- From: T
Thanks to K1DG: http://brmrg.med.virginia.edu/knots/fig8bend.html. Very clever knot. _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wire
Hi Jim -- See my earlier note for the website illustrating a double figure 8 in a bend application. As a sailor, I have used a double sheet bend frequently to temporarily join lines of dissimilar dia