If you just need a tuner... https://play.google.com/store/apps/details?id=org.cohortor.gstrings
It works on guitars and violins, so I guess it'll work on your tower. Strange. -Kristian On 08/12/2013 10:21 AM, Matt Hoppes wrote: > You can use one of these: > http://loosnaples.com/how-to-use-pt-series-tension-gauges > > Or do it by sound! > > All you need is a small tape recorder and a 3 ft piece of 2 by 4 lumber. > > Cut two small blocks off the ends of the 2x4, and nail them to the ends > of the long piece, on the side. File or saw a "v" notch in the small > blocks, along the long axis, so the guy wires can sit in the notches. > This forms two bridges, so that when the 2x4 is placed agains the guy > wire, it can be "plucked" to produce a vibration. > > Now you need to "calibrate the instrument". Take a piece of the same > guy wire, hang it from any tree, tower, frame, swingset, anthing you > can find overhead that can support about 300 lbs. Form a loop in the > guy to put your foot in. > > If you step in the loop and hang you will tension the guy to your > weight. (say about 200 lbs). While under tension, perhaps from a > friend, place the 2x4 against the wire, and pluck it like a guitar > string. Record the tone on your tape recorder several times. Hint: > placing the recorder directly on the 2x4 helps capture the tone. > > Now, while you tension your tower guys wires, place the 2x4 against the > guys, and pluck them in the same way, listening to the tape recorded > tone. When the tension is the same as your weight, the tones will be > equal. > > If you want to double the tension to twice your weight (say to 400 lbs), > the tone will have to be twice the frequency. There are several ways > to do this. > > One is to make another bridge from a notched block of wood, and place > it at 1/2 of the original separation distance. Another (if you have a > sound card and microphone) is to use your computer to measure the > frequency, and then produce one with twice that frequency with a tone > generator. Record that frequency on your tape recorder, > and use it in the field for the 400 lb "note" > > > Matt Hoppes > Director of Information Technology > Indigo Wireless > +1 (570) 723-7312 > > On 8/12/13 1:17 PM, Andris Bjornson wrote: >> Hi all, >> >> I'm looking for a field expedient (read "not requiring fancy tension >> meters and special equipment") to evaluate whether guy wires on towers >> are undertensioned. >> >> I'm currently deploying a wireless project in Northern Uganda on >> locally fabricated towers. The engineer who built the towers is very >> good, and was able to provide structural calculations for each tower. >> He does very nice work, and by and large I'm very happy with the >> product. >> >> Someone has mentioned a method to me in the past involving plucking >> guy wires and watching the pulse rate....but I didn't get any numbers >> on what's good and what's bad. >> >> Any help greatly appreciated! >> >> Andris >> >> >> >> >> > _______________________________________________ > Wireless mailing list > [email protected] > http://lists.wispa.org/mailman/listinfo/wireless _______________________________________________ Wireless mailing list [email protected] http://lists.wispa.org/mailman/listinfo/wireless
