DAPNET
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Radio-paging code No. 1 (usually and hereafter called POCSAG) is an asynchronous protocol used to transmit data to pagers. Its usual designation is an acronym of the Post Office Code Standardisation Advisory Group, the name of the group that developed the code under the chairmanship of the British Post Office that used to operate most telecommunications in Britain before privatization. Before the development and adoption of the POCSAG code, pagers used one of several codes such as binary Golay code. In the 1990s new paging codes were developed that offered higher data transmission rates and other advanced features such as European and network roaming. The POCSAG code originally transmitted at 512 bits per second. Faster transmission at 1200 or 2400 bits per second using so-called Super-POCSAG has mostly displaced the POCSAG in the developed world but the transition is still in progress.
In connection with: Radio-paging code No. 1
Title combos: Radio paging Radio paging No code paging Radio No
Description combos: POCSAG Post Advisory POCSAG No transition to Advisory of
A radio transmitter or receiver is connected to an antenna which emits or receives the radio waves. The antenna feed system or antenna feed is the cable or conductor, and other associated equipment, which connects the transmitter or receiver with the antenna and makes the two devices compatible. In a radio transmitter, the transmitter generates an alternating current of radio frequency, and the feed system feeds the current to the antenna, which converts the power in the current to radio waves. In a radio receiver, the incoming radio waves excite tiny alternating currents in the antenna, and the feed system delivers this current to the receiver, which processes the signal. To transfer radio frequency current efficiently, the feedline connecting the transmitter or receiver to the antenna must be a special type of cable called transmission line. At microwave frequencies, waveguide is often used, which is a hollow metal pipe carrying radio waves. In a parabolic (dish) antenna the feed is usually also defined to include the feed antenna (feed horn) which emits or receives the radio waves. Particularly in transmitters, the feed system is a critical component which impedance matches the antenna, feedline, and transmitter. To accomplish this, the feed system may also include circuits called antenna tuning units or matching networks between the antenna and feedline and the feedline and transmitter. On an antenna the feed point is the point on the driven antenna element at which the feedline is connected.
In connection with: Antenna feed
Title combos: Antenna feed
Description combos: the parabolic or waves feed antenna excite waves radio
Amateur radio, also known as ham radio, is the use of the radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communications. The term "radio amateur" is used to specify "a duly authorized person interested in radioelectric practice with a purely personal aim and without pecuniary interest" (either direct monetary or other similar reward); and to differentiate it from commercial broadcasting, public safety (police and fire), or two-way radio professional services (maritime, aviation, taxis, etc.). The amateur radio service (amateur service and amateur-satellite service) is established by the International Telecommunication Union (ITU) through their recommended radio regulations. National governments regulate technical and operational characteristics of transmissions and issue individual station licenses with a unique identifying call sign, which must be used in all transmissions. Amateur operators must hold an amateur radio license obtained by successfully passing an official examination that demonstrates adequate technical and theoretical knowledge of amateur radio, electronics, and related topics essential for the hobby; it also assesses sufficient understanding of the laws and regulations governing amateur radio within the country issuing the license. Radio amateurs are privileged to transmit on a limited specific set of frequency bands – the amateur radio bands – allocated internationally, throughout the radio spectrum, but within these bands are allowed to transmit on any frequency; although on some of those frequencies they are limited to one or a few of a variety of modes of voice, text, image, and data communications. This enables communication across a city, region, country, continent, the world, or even into space. In many countries, amateur radio operators may also send, receive, or relay radio communications between computers or transceivers connected to secure virtual private networks on the Internet. Amateur radio is officially represented and coordinated by the International Amateur Radio Union (IARU), which is organized in three regions and has as its members the national amateur radio societies which exist in most countries. According to a 2011 estimate by the ARRL (the U.S. national amateur radio society), two million people throughout the world are regularly involved with amateur radio. About 830000 amateur radio stations are located in IARU Region 2 (the Americas) followed by IARU Region 3 (South and East Asia and the Pacific Ocean) with about 750000 stations. Significantly fewer, about 400000 stations, are located in IARU Region 1 (Europe, Middle East, CIS, Africa).
In connection with: Amateur radio
Title combos: Amateur radio
Description combos: its spectrum bands characteristics International by in most as
WSPR (pronounced "whisper") is an acronym for Weak Signal Propagation Reporter. It is a protocol, implemented in a computer program, used for weak-signal radio communication between amateur radio operators. The protocol was designed, and a program written initially, by Joe Taylor, K1JT. The software code is now open source and is developed by a small team. The program is designed for sending and receiving low-power transmissions to test propagation paths on the MF and HF bands. WSPR implements a protocol designed for probing potential propagation paths with low-power transmissions. Transmissions carry a station's callsign, Maidenhead grid locator, and transmitter power in dBm. The program can decode signals with a signal-to-noise ratio as low as −28 dB in a 2.5 kHz bandwidth. Stations with internet access can automatically upload their reception reports to a central database called WSPRnet, which includes a mapping facility.
In connection with: WSPR (amateur radio software)
Title combos: software amateur WSPR radio software radio amateur WSPR software
Description combos: their station ratio The test which program to grid
The ICOM IC-705 is a multimode HF/VHF/UHF portable amateur radio transceiver. The radio has 5 watts of output when using its internal battery and 10 watts of output when using external power. With the rise in award programs such as Summits on the Air, and Parks on the Air this lightweight fully functional radio is a popular choice for people using them in the field. The IC-705 has support for a wide variety of commonly used amateur radio modes including ICOM's proprietary digital voice mode D-STAR. The IC-705 is also one of the first mainstream amateur radios to use SDR technology instead of the older superheterodyne design. Additionally the IC-705 has multiple extra features that are useful when operating in the field. Supporting the radio's D-STAR module is a GPS receiver to allow users to send their location though the D-STAR network as well as help locate nearby repeater systems. In addition to the GPS receiver the radio supports 2.4 GHz Wi-Fi which allows users to connect their computers or tablets to the IC-705 for running digital data modes such as PSK31, Winlink, and FT8. The radio has been praised for its size, easy to use menus, large easy to read screen and the quality of its build. Common criticisms of the radio include its lack of a built in antenna tuner and its price compared to other more powerful radios on the market.
In connection with: ICOM IC-705
Title combos: ICOM IC ICOM IC 705
Description combos: 705 repeater use when using their proprietary such internal
The ICOM IC-7300 is a multimode 6 meter, 4 meter (ITU Region 1 only) and HF base station amateur radio transceiver. The IC-7300 was announced to the public at the Japan Ham Fair in 2015. The radio has 100 watts output on CW, SSB, and FM modulations and 25 watts of output in AM. Although not the first software-defined radio on the market, the IC-7300 was the first mass-produced mainstream amateur radio to use SDR technology instead of the older PLL-based transceiver design. Designed to replace the older IC-746PRO the IC-7300 is smaller and significantly lighter than its predecessor. Like many other radios of its class the IC-7300 has an internal antenna tuner and contains an internal audio card accessible over USB. This allows the radio to be used for popular digital modes such as PSK31, Winlink, and FT8. The radio has received praise for its easy to use menus, large readable screen, and excellent audio processing.
In connection with: ICOM IC-7300
Title combos: IC 7300 ICOM IC 7300
Description combos: This is only in of screen its AM only
DAPNET (Decentralised Amateur Paging Network) is a free global paging network created and maintained by amateur radio enthusiasts. Messages can be received on commercially available pagers that support the POCSAG protocol and are tuned to the appropriate frequency.
In connection with: DAPNET
Description combos: by created global radio frequency appropriate Paging POCSAG support
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