How can I build a  Yagi Antenna for 2 meters?
342575
Here dude http://www.ac6v.com/antprojects.htm This has a list of antenna projects you can do. Hope it helps!
908785
very close to 2 meters.
964197
An antenna has no power in it.  It is a "passive" device.  The effectiveness of the antena depends upon it's phsyical characteristics and the first electronic amplifier it is connected to.\n\nAn antenna has a specific frequency that it is most effective in capturing.  That length is usually a multiple of the wavelenth of the target frequency.  Typically an antenna that is equal to 1 wavelength is the most effective.  But this is not practical at lower frequencies where the wavelength is very long.\n\nSo the coupling between the antenna and the first electronic amplifier is critical.  The technology is well established and therefore, you can purchase good antennas.  What is more important however is the physical location. Radio signals are interrupted or interferred with by buildings and landscape.  So having an antenna that is unobstructed is the best way to improve reception.  However you have to weigh the location against the distance to the radio or tv or other device, as this will cause signal loss over longer distances.
313214
You can extend its range by using powered USB hubs theoretically. To do this, run a 10 foot cable to a hub (make sure the hub is the kind that plugs into an electrical outlet) and then plug the device into the hub. Theoretically (though I've never seen anyone try this), you could daisy chain one hub to another and extend the range almost indefinitely.
318413
OOO, We did this project in IPC, except our was 20 meters -.-;;. You're ideal angle is 45 degrees. That usually gets you the farthest. It would be pretty smart to use elastic potential energy by using piece of bamboo or just a flexible stick (haha, flexible stick) or just a rubber band. Don't put anything on the egg. Our model was made with a giant rubber band that I found on the floor, and a little seat attached to the crossbow model. If your teacher is strict about a catapult model, your best bet would be to use the bamboo stick and research trebuchets.
226234
I'm assuming here that you're building a protective casing around something.\n\nYou still may be able to use metal: If you want the magnetic transparency to be for the purposes of transmitting a signal, you could try making the casing itself your antenna. But, this may only work over short distances, as the shape of any casing is likely to be a poor antenna. You might try attaching an aerial (an antenna that sticks out) to a part of the casing that won't be subject to impact, if there is such a part. If the magnetic field is to provide a locomotive force to something inside the casing, but not the casing itself, then yeah, you probably can't use metal.\n\nIf you can't get ahold of kevlar, you might try wood (try a sturdy laminate, and don't be afraid to reenforce the structure with crossbeams or just thicker material) or other plastics (solid nylon comes to mind -- check around for a plastic shop that will be able to provide you with the material and machine it for you). Stone and concrete are very hard, but probably too hard: they lack resilency, and thus tend to chip and crack.
480772
Best Buy sells them. They are like a miniature satellite dish that beams the signal. I have never tried one but I hear they work well.
233956
if you draw what the question describes,\nyou will end up with a right angle triangle ( i assume the antenna is standing up straight on the ground) with the antenna as the perpendicular on the ground (base) and the wire as the hypotenuse\n             |&#92;\n             | &#92;\n   (x+10) ft |  &#92;  50 ft\n             |   &#92;\n             |____&#92;\n\n               x ft\n\nif the wire is 50ft in length\nassuming it is fixed 'x' ft away from the foot of the antenna on the ground, then as the question tells you, the length of the antenna is 10ft more than this distance\nso applying the pythagorean theorem\n\n50^2 = x^2 + (10+x)^2\n\nso you end up with\n2500 = x^2 + 100 + x^2 +20x\nor 2x^2 + 20x - 2400 = 0\nor x^2 + 10x - 1200 = 0\n\nsolving the quadratic equation,\n\n(x+40)(x-30)=0\n\nsince x cannot have a negative value, \nwe take x to be 30 ft\n\nantenna is 30 + 10 = 40 ft high
1060195
You seem to looking for very precice and specific information where the slightest misunderstanding in communication could be an expensive and time consuming mistake. As this is your first antenna built, much of the experience has been played by ear i'm sure, asking advice in places like this.\n\nAbout an hour ago, my sister asked what I'm doing and I said I'm answering questions. As a scientist, she caught on to the fact that anyone could say anything, regardless of the accuracy of the advice, and be trusted. \n\nGiven that your after accurate specifics, I'd suggest you contact a group or discussion panel that specialises in antennas for radio astronomy, and ask the people that acutally know what they are talking about.
1135873
With no signal loss, you use zero cable.  But in answer to your question, lengths of up to ten meters coupled to an appropriate antenna would still be applicable.  A quick search yields:\n\n"30 meters of new 75 Ohm hardline has only about 3.77 dB loss at 2 GHz"
909147
The only situation there is for placing a trap at the far end of an antenna, is if that antenna is part of a multi-band antenna system. For instance, you could put a trap at the end of a 1/4 wave 20m antenna (at about 16 ft), then connect the other side of it to an additional element, for 40m or 80m use.  If the antenna is for 160m, the only reason to have an extension is for BCB or LW coverage.  Is that what you're up to?  By the way, as already mentioned, the trap has to be used at a current peak (voltage node).
259738
Google images tab is the best way. \nyou might want to look here too\nhttp://en.wikipedia.org/wiki/Antenna_(biology)
85728
984 feet to the top of the tower   1052 feet if you include the antenna
191766
Have you thought of looking into Radio Shack...they have just about anything....good luck!
14994
Check out this site here It gives step by step directions. He says it will give you a 3-5km range. That should give you roughly 1.5 miles or so.\n\nhttp://www.usbwifi.orcon.net.nz/\n\nBy the way it isn't omnidirectional, so you have to have a pretty good line of sight between antenna 1 and antenna 2.
1042847
get some alluminun foil and make it into a long snake    wrap it around the antenna   if possible  physically extend the antenna   also haveing alot of alluminum foil nearby the antenna helps   if you have any high speed usb ports on your computer   plug the adapter into them
173755
Check the chip parameters from a databook or online at texas instruments website.To make a transmitter you have to add a mixer which takes the wave input and transmits it over an antenna.A mixer can be made by a simple high freq transistor incommon emitter mode with proper biasing....input will be through the "base" and local oscillator output should be attached to the emitter side.The output will be across emitter and collector.You should attach 2 inputs one the wave and other local signal oscillator.the output which you will get will be amplitude modulated or any other modulation scheme which you choose to implement. you should have specified if it is a analog or digital type.If u want some designing help.contact me at....joe_metallica_in@yahoo.com