ie, how an aerial actually sets up the fields we use in everyday radio communications?
214633
You've actually got several concepts and questions merged together.\n\nWhen you ask "how does the aerial setup the waves from only the ac signal?"  I assume you're asking how any DC components of the signal get filtered out?\n\nA transverse electromagnetic wave involves both a VARYING electric field and a VARYING magnetic field, appearing at right angles to each other and to the direction of travel of the wave.\n\nAny DC component has no varying component, therefore, no wave is generated.  Although DC flowing through a wire creates electric and magnetic fields, no wave is generated because there is no variance in the fields.  \n\nThere are other electronics concepts that require the changing electromagnetic fields of AC to work.  A transformer uses AC, not DC.  A capacitor will block DC signals, but allow AC signals to pass.\n\nAlso, as you indicated, an efficient antenna has a matched impedance to the signal source in order to maximize the amount of engergy propagated by the antenna in the desired direction(s).
416935
You mean like a radio station? You can't really, Radio Station's  run their signals  on different frequencies then a wireless router.\n\nYou don't have the hardware to broadcast that high of a frequency not to mention modulate it. Like FM or AM..\n\nYou can do Internet raido..
25555
High frequency radio waves. Around 1700 Mhz.
322138
The basic components are:\n\nAn antenna (to "capture" the RF signal)\nA filter (LC circuit to tune to the frequency of interest)\nAn amplifier (to amplify the weak signal)\nAn FM demodulator (to downconvert and "decode" the FM signal and get back the baseband signal which is what our ears interepret as sound)\nAnother amplifer (make it variable so you can change the volume)\nA speaker\nOh, and of course the power supply (battery) to bias all the active components.\n\nI know you asked for a wiring diagram...but maybe try purchasing each of the above components seperately as modules and put the thing together... just do a google search... but congrads for trying to build an FM radio... It shouldn't be too bad... Make sure you have a bread board....
138291
Throughout the world soon after the "transmitter" was first invented, there was a need to identify radio stations by letters (or as you say "initials").  For example, I happened to be licensed by the FCC (USA) as "WA2BLM".  The various licensing authorities devised a "call sign" "scheme" so that in case there was some sort of interference between this particular transmitter and a receiver, they could readily identify the particular transmitter.  Today, call signs are groups by what you call "initials" based upon country located and certain combinations of letters and numbers to signify the type of radio station (e.g. tv/radio versus public safety such as police, amateur radio a/k/a HAM Radio) etc.
275744
run it like you would run a regular field
261163
Yes!\n\nAs it turns out, radio waves are nothing more\nthan the propagation of electrical and magnetic\nfields through space--the E & M fields perform\nan intricate dance around each other and fly\nthrough space.  So yes, you can transmit\nenergy through the air and "catch it" with\na receiver antenna. That's exactly\nwhat a microwave oven does:  the business\nend of a microwave is a transmitter and antenna,\nand the food is the receiver.\n\nI suspect the energy needed to propel\na car-sized vehicle, however, would involve \ndangerous amounts of power.  Any bird, pet,\nor human which passed between transmitter and\nvehicle would be zapped.  Streets\nwould be littered with smoking corpses, and\nyou'd smell BBQ all day.\n\nBut hey, BBQ ain't a bad thing!
279100
Despite the Rolling Stones song, you can't always get what you need. And everyone knows you don't always get what you want.\n\nSatellites broadcast to a fairly large footprint on the ground. So you can, if you're in its footprint, and with an appropriate antenna, properly aimed, and an appropriate low noise amplifier, receive a signal. Whether you can make sense of what you've received is quite something else altogether. TV satellite broadcasting is protected from indiscriminate reception with one or more technological tricks. You can, unless the box vendor is the FBI in desguise, buy 'descramblers' for satellite and cable TV signals in the backs of various magazines. On the Internet side, you presumably want to receive the contents of this or that web site, not just any old broadcast of Internet data, and so even if you can descramble (for free because you've got your own descrambling box now) a satellite signal, it won't be what you wanted. \n\nSo, you must have the ability to send control signals to the broadcast origin point (always a ground station somewhere, given the constraints on space and weight for these satellites). \n\nAnd they'll ignore you without an account (and so $ from you) for two reasons. You don't have an account on their computers which allows you to arrange for connections to the Internet (and the Web site you're after), and you don't have the appropriate authenticaiton to talk to the satellite so it will pass your control signals back to the ground station. \n\nSince satellites are expensive to design, build, launch, and maintain, there are no hobbyist groups providing free Internet access. without that, you're limited to commercial services (or government service if you're eligible) and they will universally require some sort of authentication (typically cryptographic at the information carrying level, and usually some raw signal based authentication as well) before you can use the system, and that will require a business relationship before they will set one up for you. And for that they will want a fee.\n\nI think you aren't going to get what you want. And you're probably not going to get what you need, if you define it as free Internet access by satellite. I recommend WiFi or something similar, if it's possible where you're located.
22092
Outfit two trucks with receivers driven by directional antennas.  With the trucks a reasonable distance apart, each antenna is adjusted for maximum signal reception of the jammer.  Plot the location and direction of each antenna on a map; where the direction lines intersect, that's the jammer location.
317892
Fields? What sort of fields are you talking about? If you can provide more details, we might help you.
224080
That's because its supposed to be secret! Something like the frequency and much more. We aren't permitted to braodcast anything above permitted frequency, as a part of general public. (Frequency emission includes, usage of home-RF devices) Please make sure to get information from the military if you are making a geniune effort, other than, putting the stake at risk!
397918
What they do is that they run along the field with a conducter connected to voltage meter.  Lol.  Just kidding.  They set up "antenna like " conducters in a field that is most frequently hit by lightning, and all of these conducters are connected  to voltage meter.
85974
Oscillation and Modulation of waves produces FM Radio waves. Here is a site which has some good and simple circuits. But remember Transmitting Radio Waves without a license is illegal in most countries..
218924
ADF's detect an electric field and a magnetic field which are perpendicular in space and their amplitudes vary sinusoidally with time. The magnetic field induces a voltage into the windings of the ADF loop antenna. By measuring the phase difference between the windings the ADF is able to determine the direction of the beacon. \n\nPutting beacons around the house and using ADF to navigate turns out to be expensive and inefficient as GPS and proximity sensors are available and work better.
509841
If you want to build it to a specific value, I recomend getting a copy of The Radio Amateurs Handbook from your local library.  It has info and formula for air core, ferrite core, and toroid core inductors.  You might try their website www.arrl.com
109948
You'll find it at:\n\nwww.tekzoned.com/whatswrong\n\nBe sure to tell them to turn their volume up so they can "hear the instructions"\nHave fun sending it to people!! he-he-he
286904
You shouldn't have many problems as they are a fair distance away. In the area surrounding overhead lines (and also radio towers, in particular mast antennas) it is dangerous to risk interference; e.g. flying kites or chain balloons, using ladders or operating machinery. However, you would have to be a lot closer than you are in order for there to be a problem. While there are claims that it causes problems, they are simply claims.