I am in the process of putting together a project that will consist of phased 1/4 wave verticals for 80 meters. For my QTH the most cost effective resource of aluminum tubing is 3 inch irrigation pip
Pat, Check Section 6.1.1, page 9-55 in ON4UN's latest book. Description of an irrigation pipe vertical there. 73 Don K5AQ _______________________________________________ _____________________________
Pat, Check out N6RK, Rick's web site. He has quite a bit of info on using irrigation pipe for verticals: http://www.n6rk.com/ 73 de Terry KK6T _______________________________________________ ________
You will need ±63 feet of 3" irrigation pipe. I found a thin wall conduit that fit inside, barely. I had to slit the conduit lengthwise and compress it with a couple of SS hose clamps. It then
Pat: For 3" irrigation tubing, I used EMT conduit bought at a local electrical supply house. At this time, I do not remember the exact size I used. However, one of the standard sizes fits very nicely
Author: "Marlon K. Schafer (509) 982-2181" <ooe@odessaoffice.com>
Date: Fri, 3 Nov 2006 11:02:36 -0800
I've had customers use that aluminum handline pipe for a 30' pole on a house. Guyed it 3/4 of the way up and hinged the bottom. It's been there for a couple of years now. Marlon (509) 982-2181 Equipm
So-called "2 1/2 inch" water pipe or conduit has an OD of 2 7/8 inches. Thinwall 3 inch conduit has an ID of 2.9 inches. This allows for a 12.5 mil gap, theoretically. This might work for tubing in p
I built a few telescoping verticals with one section each of 3" and 2" irrigation pipe. I made aluminum bushings to fit the 2" inside the 3" and permit them to telescope for transport and to adjust l
Hi Red, Were you able to find different pieces of pipe to make the bushings or did you have to machine them? 73 Gary K4FMX _______________________________________________ ____________________________
Hi, Gary; I machined them from a piece of 3" OD 1/2" wall aluminum I found at a scrap yard. Just got lucky! I have a small lathe and removed a few thousandths from the ID for bushings at the top of t
Hi, Gary; The coupling between a 2" OD and a 2.9" ID (the two pipes) is 46 picoFarads per foot. Guess we better put in the aluminum connections. The reactance of 46 pF is 124 Ohms at 28 MHz and 870 O
You can use aluminum stovepipe tape to bridge the gap. Rick N6RK _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@conte
Stovepipe tape?? Tacky. Use aluminum pop rivets. I used them and had no problems for the 7 years that my 4 square was up. If you're worried about conductivity between the two adjoining sections, just
You don't understand what I meant. I transition between pipe sizes with PVC pipe couplers. This gives me an insulated joint. If I don't want an insulated joint, I "aluminum plate" the PVC pipe with t
Once again you folk have come thru with lots of pertinent information in response to my questions. I would like to thank all of you for your responses. My plan at this point is to use my extention la