Or just invest in an $80 cable tension gauge. These can fit in your toolbox or your glove compartment. Why would you want to guess at this?
On Mon, Aug 12, 2013 at 12:27 PM, Kristian Hoffmann <kh...@fire2wire.com>wrote: > 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 > > Wireless@wispa.org > > http://lists.wispa.org/mailman/listinfo/wireless > > > _______________________________________________ > Wireless mailing list > Wireless@wispa.org > http://lists.wispa.org/mailman/listinfo/wireless >
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