Radio Research Paper

In comparison to other radio systems, multi-site trunked radio systems provide the best coverage. Multi-site

Handheld radios will be used as the primary communication device. Each radio will be fully charged prior to the event, and set to channel 1.

The COM-3011 operates by first mixing the received signal with 125 MHz, thus the data is now contained on it. The centre frequency is chosen by mixing a user specified radio synthesiser frequency with the 125 MHz together. For example to obtain a centre frequency of 100 MHz, the user would specify 225 MHz or -25 MHz. The bandpass filter will reduce the bandwidth to 40 MHz or 20 MHz either side of centre frequency [12]. This sample is the duplicated and the second part delayed by 90 degrees to form an in-phase and quadrature features.

On old radios the antenna was detrimental to the radio’s operation. Today, the antenna is not necessary. AM radio does not have as good of quality as FM but it can travel farther distances. FM signals can be interfered by things such as mountains or other barrier

The increased demand for radio spectrum has resulted from the evolution of feature-rich and high-data-rate wireless applications. The spectrum is limited, and the current radio spectrum regulations make its use less productive. This has necessitated the development of dynamic spectrum allocation policies to make the utilization of the existing spectrum in a better way. As per the current spectrum allocation regulations, specific bands are assigned to particular services and only licensed users are granted access to licensed bands. Cognitive radio (CR) is expected to modernize the way spectrum is allocated. In a CR network, the cognitive radio part allows the unlicensed users (secondary users) to access spectrum bands allocated to the licensed

ANS: The entire process is performed by multiplying a radio frequency carrier and a pseudo-noise (PN) digital signal. The PN code is modulated onto an information signal using several modulation techniques such as quadrature phase-shift keying (QPSK), binary phase-shift keying (BPSK), etc. A doubly-balanced mixer then multiplies the PN modulated

The Radio was introduced to society because of the telegraph and the telephone. These inventions don’t do the same things but their similar branch of technology. “Radio technology began as “wireless telegraphy”. “It all started with the discovery of radio waves, electromagnetic waves that have the capacity to transmit music, speech, pictures and other data invisibly through air.” [Bellis] Majority of technology uses electromagnetic waves to send data information or TV broadcasts. During the 1860’s, Scottish physicist, James Clerk Maxwell predicted the existence of radio waves; and in 1886, German physicist, Heinrich Rudolph Hertz showed how fast the variation of electric current could be placed into space in the form of

Amateur Radio, better known as “Ham Radio”, is a hi-tech international hobby that exists for personal two-way communications, experimentation, and public service that is greatly enjoyed by people from all walks of life and all corners of the world. Ham radio has been referred to as “Old school” Communications since it has been around for over one hundred years and still going strong. It has also been compared by many as the Facebook, Twitter and the first wireless phone from the old days.

The radio still important to use gain information since 1920 until this century for all people live around the world. Even today we have more modern technology like TV, internet, but the radio is still popular for this modern society. Moreover, the radio has been improved itself to provided a good service for all customers. Today we can listen the radio 24 hours a day 7 days a week. The news comes on the radio daily providing with local news, international news, and weather. In addition, the varies of the radio station give a different topic of information like the history, technology, and society is very important for leaner. The radio made more easy for a illiterate to get information the same with people

Wireless networking hardware requires the use of underlying technology that deals with radio frequencies as well as data transmission. The most widely used standard is 802.11 produced by the Institute of Electrical and Electronic Engineers (IEEE). This is a standard defining all aspects of Radio Frequency Wireless networking

Software defined networking is a concept born out of the need to control network devices centrally, wherein the service offered by a device is decoupled from the device in a way that

Once the transformer sends out the radio signal, it is sent to the crystal oscillator which is another important part. The oscillator makes an electromagnetic frequency by vibrating a piece of crystal. Once it is modified by the oscillator, the signal is complete and ready to be broadcasted.

Once the signal is received, these receivers will demodulate the signal – meaning to extract the modulation from the received signal.

An SDR is a radio in which the properties of carrier frequency, signal bandwidth, modulation, and network access are defined by software. Today’s modern SDR also implements any necessary cryptography; forward error correction (FEC) coding; and source coding of voice, video, or data in software as well.

For that a Software-defined radio SDR receivers matching with good antenna and an efficient software systems are required