design and describe a communication line dat can send info frm pt A to pt B.No HF radio,phone nor microwave.?
138933
You can always put a modulated signal over the 60Hz (or 50Hz if you are in other parts of the world) carrier.  There used to be a stereo system which used this concept to remote speakers around the house.
239908
TRANSMITTER ,RECEIVER, ANTENNA COAX SWITCH, COAXIAL CABLE FOR ANTENNA, ANTENNA, ANTENNA STRUCTURE. 2 EACH. MAKE A SYSTEM.\n\nOR\n\nTRANSCEIVER , COAX , ANTENNA, ANTENNA SUPPORT! 2 EACH. MAKE A SYSTEM.\n\n\nTRANSCEIVER COULD BE FM, OR AM. AIRCRAFT USE AM FOR PLANE TO PLANE AND PLANE TO GROUND. POLICE , FIRE, UTILITIES AND MOST LAND MOBILE USE NARROW BAND FM. CB IS AM MODULATION. THE NEW CB IN HIGHBAND IS 900 MHZ FM THIS IS WHAT YOU CAN GET AT WALMART IN THE LITTLE WALKI-TALKIES! WITH A 6 MILE RANGE!\n\nA SYSTEM IS SYMPLY A SENDING STATION AND A RECEIVING STATION. IT CAN BE VERY COMPLEX OR AS SIMPLE AS A SET OF WALKIE TALKIES. A SYSTEM IS A FUNCTIONAL DEFINITON FOR SOMETHING THAT WORKS!\n\nA SYSTEM COULD REFER TO A SYSTEM THAT YOU USE AROUND YOUR HOME TO KEEP IN COMMUNICATION WITH YOUR FAMILY! OR IT COULD BE A SYSTEM THAT A BUSINESS USES TO STAY IN TOUCH WITH ITS EMPLOYEES! A SYSTEM IS JUST A FUNCTIONAL DEFINITION OF A OPERATIONAL "SYSTEM". IT IS THAT SIMPLE!\n\nHOPE THAT CLEARS THAT UP FOR YOUR!\n\n\nDO ME A FAVOR AND VOTE TO BREAK THE TIE ON YOUR QUESTION ON RADAR AS A DISTANCE FINDER IF YOU HAVENT CHOSEN A ANSWER YET SO THAT ONE OF US WILL GET OUR POINTS !\n\n\nTHANK YOU!!! \n\n\nSEE THE FIRST QUESTION!\nYOU ASKED THIS TWICE\n\nAPS\n\n\nhttp://answers.yahoo.com/my/profile;_ylt=AkNRDPHU4.dwE9DX6LQDRNgezKIX?show=AA10836052\nPOGI N POGI 88 YOU HAVE A PROBLEM YOU ARE NOT SELECTING THE ANSWERS!  YOU ASK QUESTIONS BUT DO NOT SELECT THE ANSWER! BECAUSE I AM SELECTING THE ANSWERS SO FAR FOR YOU ON YOUR QUESTIONS! ME! GET WITH THE PROGRAM! YOU ARE RUNNING OUT OF POINTS! SELECT THE BEST ANSWER YOURSELF! DO NOT LET IT HAVE TO GO TO VOTE! DO YOUR DUTY!  YOU HAVE NO POINTS THIS WEEK!  GET WITH THE PROGRAM!  IF YOU ASK QUESTIONS SELECT THE ANSWER OR DO NOT ASK!\n\nTHERE ARE WAYS OF TELLING!
986929
want cheap?  Try the loacte wirless seach tool that comes w/ your comp.\n\nIt will locate any in the area and display signal strength.  \n\nCheap is free and free is....well you arn't paying for it someone else is lol.
445900
Technology used in communications and getting/sending information.  This includes computers and their programs, applications, internet, etc.
194657
sender , message , channel , receiver
69952
e-bay ----radio shack----ask a electritian in the phone book
1134884
microwave are the same as radio waves \nsatellite are when you transmit to a satalite \nradio waves are basicly any sound. \nlaser is energy in the form of light, \noptical fiber is used for telephones which transport light instead of radio waves, which is much faster\ninfared it think is just a laser used to transfer data
330658
Any signal transmitted through the air can be picked up by ECHELON. All data on the Internet travels through at one time or another. Mostly to satellites and back.\n\nThe only communications you could use that ECHELON won't pick up is two cans and a string.\n\nHope this answers your questionl.
925755
Microwave is the back bone of many of the distant multiple telephone svc. the wide band satellite service is the link to tie the world together. Tv & telephone service. The radiation doecnt cause any real health problems as the beams are very direct as a beam of light. It is a lot of our world communications.
30942
If it'smade from iron materials the electromagnetic wave will be absorbed by the iron and the signale in teh phone will be so bad
91669
Short Message Service\n\nA little bit like the SMTP (Send Mail Transfer Protocol).
289454
library.  they may have one.  or you can contact the bell corp.  they will sell you one.
357049
Any man-made device that makes communication easier/more reliable.\n\ni.e. A telephone
597925
Micro Electro Mechanical Systems\n\nIt is very hard to build as u should knw communications very well
323511
Possibily wireless data link or direct setallite link.\n\ncheck out with your ISP that you are willing to do something like that he will give you a perfect idea about what's going on in their scenario and how are they doing it.
445689
Radio shack has a book (about $20) that has every freq you could ever need in it , even your local #'s
948090
They send a radio frequency.  Max distance depends on circuit design, battery strength, intervening obstacles, and so on.  Anywhere from 15 to 30 feet.