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Wireless Communication

This rapidly growing segment of the communication industry has the potential of providing high-speed high-quality information exchange between portable devices. Wireless communication enables several applications including multimedia Internet-enabled cell phones, automated highway systems, smart homes and appliances and videoconferencing, among others.

4,616 Questions

What was Marconi's first message across the English Channel?

>> It was when the Titanic Sank. The message was "the titanic is safe"even tho it did

- Actually, this was NOT the FIRST message sent. Obviously, by the time of the Titanic sinking (April 1912), the Marconi wireless were an industry standard and had been in widespread use for years.

The first message across the English Channel was in March 1899, the content by some accounts was, 'Are you ready?"

Why should kids have cell phones for emergency?

You've answered your own question, but it would be naive to imagine a child is going to confine his/her use to emergencies unless it's possible to have the 'phone call-barred to all but emergency or home/school numbers.

What is GSM communications?

GSM stands for "Global System for Mobile communications", which was a replacement for the former AMPS and TDMA (Time Division Multiple Access) formats of analog cellular telephone transmissions.

GSM is currently used by over 3 billion people across more than 212 countries and territories, over 82% of the world's population.

GSM's advantage over its predecessor is that it is 100% digital, as opposed to TDMA, which was analog. While covering a shorter distance than the analog signal, a GSM signal can carry more voice and data communications than the analog band, and carry it at a faster rate, thus making GSM a "second-generation" (2G) cellular technology.

Most GSM networks operate in the 900 MHz or 1800 MHz bands. Some countries in the Americas (including Canada and the United States) use the 850 MHz and 1900 MHz bands because the 900 and 1800 MHz frequency bands were already allocated.

What could cause your cell phone charger to blow two 20 amp fuses in a 2005 Ram 1500 when the charger's 2 amp fuse is fine?

Clearly the high current problem is not going "through" the 2 amp fuse, so, it's not going through the charger itself. One possibilty is the lighter socket itself and the way the charger fits it. That particular charger may fit in the socket so that it causes a short when you plug it in. Physically it's connecting the outside and the center of the socket (+12V) together. A 12 Volt socket is no marvel of engineering, it's barely adequate for connecting anything to but it became a standard anyway. The fit of each socket varies from one vehicle to the next, it's not supposed to be able to short under use but I've seen it happen. If that's the case you need to adjust the way it fits, replace the socket, etc. Another possibility is the way the center wire moves "behind" the socket when you plug something into it. The center wire gets pushed back in a little and may come in contact with a ground and pop! There goes the fuse. You can determine what is going on by looking at the socket and the end of your charger where it plugs in. Blowing 20 amps fuses takes quite a bit of current so most likely this would leave a mark on whatever metal was in there causing the short. Check for a very small burn mark on the tip of the charger. If there's a mark then you know which part was touching where it shouldn't be. Also check that no foreign object fell into the socket like a tiny piece of metal. If you want to check out the charger itself try it on another vehicle or get some wire, put a 2 amp fuse in-line with it and connect the charger to any 12V DC source. Make sure you get the polairty correct, usually the center post is positive, and the outside is negative. When you connect it nothing should happen other than the charger turns on. If it blows the new in-line 2amp fuse then there is a problem with the charger itself but that's not likely. I think the charger is shorting the vehicle socket when you plug it in. Dave

What does it mean when cells become differentiated?

When a cell becomes differentiated it has gone through dysplasia and metaplasia to another cell type.

Effects caused by opening angle of a pyramidal horn antenna?

The opening angle of a pyramidal horn antenna is to match the impedance of the horn antenna to that of free space. With this enlargement of the dimension, the velocity of the wave travelling will decrease. This will increase the guide wavelength, which in turn increases the impedance of the horn. This gives an impedance value closer to that of free space there by giving better power transfer.

C plus plus code for selling cellular phones it should be able to add view search and delete Product ID No Product No country brand and cost?

#include<iostream>

#include<map>

#include<string>

#include<sstream>

#include<conio.h>

struct Cellphone

{

std::string product_id;

std::string product_no;

std::string country;

std::string brand;

double cost;

};

std::ostream& operator<< (std::ostream& os, const Cellphone& phone)

{

os << "Product ID: " << phone.product_id << std::endl;

os << "Product No: " << phone.product_no << std::endl;

os << "Country: " << phone.country << std::endl;

os << "Brand: " << phone.brand << std::endl;

os << "Cost: " << phone.cost << std::endl;

return os;

}

// Global...

std::map<std::string, Cellphone> cellphones;

// forward declarations

size_t choice (std::string);

std::string get_string (std::string prompt);

double get_double (std::string prompt);

void add();

void remove();

void search();

void view();

int main()

{

while (1)

{

std::cout << "MAIN MENU\n=========\n\n";

std::cout << "[A] Add\n";

std::cout << "[V] View\n";

std::cout << "[S] Search\n";

std::cout << "[R] Remove\n";

std::cout << "[Q] Quit\n";

switch (choice ("AVSRQ"))

{

case 0: add(); break;

case 1: view(); break;

case 2: search(); break;

case 3: remove(); break;

default: return 0;

}

}

}

void add ()

{

std::cout << "\nAdd Cellphone\n\n";

Cellphone phone;

phone.product_id = get_string ("Product ID");

phone.product_no = get_string ("Product #");

phone.country = get_string ("Country");

phone.brand = get_string ("Brand");

phone.cost = get_double ("Cost");

cellphones[phone.product_id] = phone;

std::cout << std::endl;

}

void remove ()

{

std::cout << "\nRemove Cellphone\n\n";

std::string id = get_string ("Product ID");

cellphones.erase (id);

}

void search ()

{

std::cout << "\nSearch for Cellphone\n\n";

std::string id = get_string ("Product ID");

std::map<std::string, Cellphone>::const_iterator it = cellphones.find (id);

if (it choices.npos)

continue;

return pos;

}

}

What is worse talking or texting while driving?

It will have to be texting, since you have to bring away your attention from the road; to the phone to text message. Still, talking and texting on your phone is dangerous and could result in fatal damage towards your life and your car.

Which is the best two-way radio Motorola ht1000 uhf or Motorola gp300 vhf?

The Motorola Radius GP 300 was designed to be a business-class portable targeted at business, industry, school districts, and other non-public-safety users.

The Motorola HT 1000 portable was designed to be a public-safety grade portable, and as such is built much stronger than the GP 300. The HT 1000 also supports many more signaling formats than the GP 300 does.

Where are your blindspots while driving?

They vary from car to car, but generally about 45 degrees behind you on either side. If you want to know exactly where yours are; have a fried stand behind and off to the side of the car as if they were a vehicle in a lane next to you. make sure they are in a location where you can see them in the side rearview mirror. Next have them walk forward toward you as if they are in that "lane". Where you lose sight of them in the rear view, until you see them out your window is your blind spot.

Where does cell phone GPS tracking work?

Cell phone GPS tracking works anywhere the device has a clear line of sight to GPS satellites, which typically includes most outdoor locations and some indoor spaces with access to the necessary signals. However, dense urban areas or places with significant interference may impact the accuracy or availability of GPS tracking.

How do you do alphabet on a cell phone?

It depends on the type of cell phone. Every brand has a slightly different way of entering text.

Why does your 1976 Datsun 280Z stall then die while driving?

CHECK YOUR FUEL PUMP RELAY! One posibility is you need a better ground from your altanator to your regulator. Add a ground wire from the altanator to your regulator it cheap and eazy to do. It fixed a problem I had that when I turned on the head lights with the engine running the engine died. Bad ground do many bad things that are hard to identify.

What is domi cell phone number?

Do you mean "domicile"?

Domicile generally refers to the place of residence, i.e. - the apartment, house, or whatever.

What is rds?

RDS (abbreviated for Radio Dimensione Suono) is one of Italy's major radio station networks with its main studios in Rome. Radio Data Systems (RDS) is a sub-frequency of FM radio, sent along with a normal music signal. It allows text to be displayed on RDS-enabled radios. Song and artist names can scroll across the stereo screen. RDS is available in various vehicle models offered by leading automakers.

What are the career options for an Industrial Operations Engineer?

An Industrial & Operations Engineer has a variety of career options. Industrial & Operations Engineering is often referred to as "Business" Engineering. An Industrial & Operations Engineer can go into Manufacturing, Logistics, Safety Management, Information Technology, Finance, Business, Urban Planning, Consulting and much more. The purpose of an Industrial & Operations Engineer is to make a process "more efficient". Take for example, the assembly line. The creation of this business process is at the heart of not only business & finance, but Industrial Operations Engineering. Industrial Operations are often found in manufacturing plants where they analyze the business process. They may analyze the work flow of the machines and people that make a product. Or they may look at ways to cut beuracracy and costs. Industrial & Operations Engineers use simulation software programs to help them determine the number of workers needed based on time/work studies. They also conduct one-on-one and group interviews with factory workers. Many Engineers have also focused on Information Technology. They create computer programs that will help improve the efficiency of a business process. The software options are virtually unlimited. This type of engineering requires an extensive math, science, and business background.

Connect PS3 vai Mobile phone for internet?

If. U have android download quick settings and then settings get wifi hotspot turn on and connect to ps3.

How do you share your music files via bluetooth from your dell xcd35 mobile phone?

I am not able to send songs through bluetooth to another mobile in DELL XCD35, there is no option to send.

What parts are needed to make an ever-lasting flashlight?

AnswerWow, ID1177301194 put ANSWER in the answer box. Okay, well you should start with getting the materials.

Materials


  • 2 D cell batteries [use alkaline instead of heavy-duty (carbon-zinc) batteries]
  • (2) 5" pieces of number 22 insulated copper bell wire with approximately 1" of insulation stripped off all ends
  • Cardboard tube (toilet tissue or paper towel) cut to 4" in length
  • PR6, or number 222, 3-volt flashlight bulb
  • 2 brass fasteners (brads)
  • 1" x 3" cardboard strip
  • Paper clip
  • Tape
  • Bathroom-size paper cup
Note: You can use C or AA or even AAA batteries. You just need something smaller to hold and contain the batteries and the won't last as long.

Procedures
  1. Push brass fasteners through tube. Attach a paper clip. This clip will be like an on and off switch.
  2. Inside the tube, attach a wire to each brass fastener. Tape batteries together and insert one into each tube, (+) to (-).
  3. Tape one end of wire very securely to bottom of one battery's negative (-) terminal.
  4. Pass other wire end through a hole (large enough to insert light bulb) in center of cardboard strip. Then twist the wire around bulb and insert the bulb into cardboard strip. This strip, when taped to tube, will position bulb for contact to positive (+) terminal.
  5. Use a paper cup as a reflector by inserting bulb through a hole punched in bottom of cup. Tape securely.

HAVE FUN.

DO NOT USE HOUSEHOLD ELECTRICAL CURRENT! IT MIGHT SHOCK AND KILL YOU!!!