TREG'rs, I must protest the UGH below. I think Decodog needs to lighten up a bit.
I find Tin Cans and Strings Telecom a facinating idea. I have a few comments and some proposals. Before we go too much farther with Tin Can Telecom Standards we need a couple of reality checks. 1. The use of softdrink or beer cans as transmitters & receivers will not work. The bottoms are domed inward to withstand the internal pressure of the can. The doming makes them poor diaphrams. The use of soup or fruit cans are much better. They generally have annular rings creating the action of a true diaphram. 2. The string should be something of low mass, high tensile strength, minimum ability to stretch and must be temperature stable. I would suggest the use of a co-polymer monofiliment which is currently the rage in the fishing world. Under high load conditions the use of spider wire might be better. It has incredible strength with very a small diameter. This would give low mass and reduce the shouting power required. There is only one problem with using monofilament: it could be stolen by someone and used for fishing. Much in keeping with the problem of strung wire being stolen in Middle Eastern countries and sold to artisan for making beaten copper items. (Note: For the unwashed spider wire is a form of fishing line. That is made of braided co-polymer monofilaments that have extermely high tensile strength for its mass and diameter size.) 3. How taut the string to preload the diaphram should also be a consideration. This will have a large effect on the frequency response, return loss, shouting power required (sound pressure) and how the string must be anchored to the can bottom or top, if can has been opened upside down. 4. For safety I propose we consider some kind of portable lightning rod. Especially for those applications in areas with a high occurance of lightning. i.e. the area around the South Carolina /Florida border. My suggestion is to use the portable lightning rod I invented and for which I have applied for patent. Without giving too much information away on the construction and exposing the contents of the pending patent. It's target application is golfers and umbrella users, but I don't see why it can't also appliy here. It is constructed of a short length of #4/0 welding cable which is connected at one end to a rod that can be either handheld or strapped to the golf club and umbrella. The other end is connected to a manually driven steel ground stake. Very simple, low cost and effective. #4/0 welding cable was chosen for its flexibilty and current carrying ability. At this time I am unable to describe the construction of the rod or ground stake. That would expose too much of the patent application. Comments and advise gladly accepted. Regards Duane >You guys still on the can and string thing, UHG! > > > > > >>I appreciate all the help I've been offered on the Tin Cans and Strings >thelecom >>standard but don't believe the discourse should take up any more room on this >>TREG channel. I am about to launch the "International Order of Unstructured >>Telecommunications Standards Individuals (IOUTSI)" and have a compilation >of the >>suggestions made for our first product, the "tin cans and string >>standard". (I >>also heard about an urgent need to update and internationalize the old BSI >>standard on garden gnomes.) >> >>If you want a copy of the outline of the new TC&S standard or want to >>join the >>"order" please >>respond to me at [email protected] but don't plug up TREG with your >>comments. >> >>(IOUTSI is prepared to accept donations in the form of a reflector, corporate >>ties (neck) and >>stolen umbrellas [prefer test house umbrellas]). >> >> >>Ciao, >> >> >>Vic >> >> >> >Decodog >Webmaster >"Cabledogs on the Net" >http://www.cyberhighway.net/~wiredog/cabledogs.html
