South Africa also permits use of standard CB channels1927 (27.18527.275MHz) with AM / SSB permitted. Shortwave And Ham Radio Bands For example, channel"11A" is 27.095MHz, spaced 10kHz after standard channel11 (at 27.085MHz) is used to provide for part of European railroad's Eurobalise radio communication with trains. Skip contributes to noise on CB frequencies. The United States Government has exclusive usage rights to the 25.33 MHz-25.55 MHz band, the 26.48 MHz-26.95 MHz band, the 27.54 MHz-28.0 MHz band, the 29.89 MHz-29.91 MHz band and the 30.0 MHz-30.56 MHz band. CB was the only practical twoway radio system for the individual consumer, and served several subsets of users such as truck drivers, radio hobbyists, and those in need of shortrange radio communications, such as electricians, plumbers, and carpenters, who needed to communicate between job site and main office. Many users of handheld radios (families, hunters and hikers) have moved on to 49MHz and the UHF Family Radio Service; those needing a simple radio for professional use (e.g., tradesmen) have moved on[citation needed] to "dot-color" Business Band radios and the VHF Multi-Use Radio Service. The advantages of fewer users sharing a frequency, greater authorized output power, clarity of FM transmission, lack of interference by distant stations due to skip propagation, and consistent communications made the VHF (Very High Frequency) radio an attractive alternative to the overcrowded CB channels. 11DX.net is free to use. In some instances, the sale or ownership of foreign-specification CB gear is not illegal but its use is. The SE-10MB comes with a UHF connector. CB has lost much of its original appeal due to development of mobile phones, the internet and the Family Radio Service. ", "(CB Rule7) On what channels may I operate? South Africa has a 23channel AM / SSB 29MHz CB allocation (called "29 Megs" or "29 MHz CB") from 29.710 to 29.985MHz in 12.5kHz steps. Channels1014 and 23, after channel9 was reserved for emergency use. Far as ground plan antennas the best I have ever used is a 5/8 called a shockwave built in alabama. Almost all were AM-only, although there were a few single sideband sets. Freebanding is done with modified CB or amateur equipment, foreign CB radios which may offer different channels, or with radios intended for export. Citizen band radio is a short distance radio communication system that operates within a selected range of forty channels. [citation needed]. Citizens band radio (CB) operates on the 11-meter band on 40 channels between 26.965 MHz and 27.405 MHz. In the United States, the number of users and law enforcement financing by the Federal Communications Commission mean that only the worst offenders are sanctioned, which makes legitimate operation on the citizens band unreliable. Prefix Lists | Tango Mike 11m Band DX Group For instance, channel19 shifted two bands up is 28.085MHz, which is in a Morse code / data-only part of the 10meter ham band. Whereas, the bands on the right (11, 15, and 20 Meters) are much narrower (<3% at the design frequency) and can realize a higher gain and still cover the whole band with an SWR <= 1.75:1. Project #1 - 2000. [2] There were two classes of CB radio: "A" and "B". Originally, the U.S. had 23CB channels; the 40channel band plan was implemented in 1977. The European Conference of Postal and Telecommunications Administrations (CEPT) adopted the North American channel assignments, except channel23, frequency 27.235MHz; channel24, frequency 27.245MHz; and channel25, frequency 27.255MHz. [3]:174 On some newer radios, the modification may be as simple as disconnecting a jumper wire or a diode. In Russia and Poland, the channels are shifted 5kHz down; for example, channel30 is 27.300MHz. The BIG difference between 11-meters and the Ham bands is the Calling frequency which is 27.555 Mhz Let me remind you of the 11-meter procedure: 1. The original channels1, 2, 3, 4, 10, 21 and 23 were deleted from the 18channel band plan. The regulations called for one licence per CB radio. South Africa, like New Zealand and the UK, permits the use of two HF CB bands. This agreement provides interference-free operation for all operators by separating the far more powerful SSB stations from the AM stations. 11 meters is often defined as 25-28 MHz / 25000-28000 kHz or 26-28 MHz / 26000-28000 kHz. As in Germany, digital modes are allowed on certain frequencies. inexpensive ham radios for 11 meter conversion Until 1975,[12]:14 only channels914 and 23[a] could be used for "interstation" calls (to other licensees). CB radios have a range of about 3 miles (4.8km) to 20 miles (32km) depending on terrain, for line of sight communication; however, various radio propagation conditions may intermittently allow communication over much greater distances. Channels 23[27.235MHz], 24[27.245MHz], and 25[27.255MHz] are not on the same radio frequencies in the. A few operators still illegally utilize the 40CB channels. Under this class assignment, a CB radio is classified as a "Personal Radio Service device". Germany authorizes a similar allocation, with 40channels from 26.965 to 27.405MHz and another 40channels from 26.565 to 26.955MHz in regular 10-kHz steps. The prominence of CB radio grew in Britain partly due to the success of novelty songs like C.W. This solution also resolves the confusion created by the false advertising that SSB radios have 120channels compared to only 40 for AM radios. Operation on frequencies above or below the citizens band (on the "uppers" or "lowers") is called "freebanding" or "outbanding". In general, each channel can only support one AM conversation and no others; if no AM conversation is in progress, two SSB conversations can share one channel without interference if one is in LSB and the other in USB mode. For the convenience of users of the grid were marked by letters. SM2YER Goran's Homepage. In the early 1970s Radio Shack sold a "base station" CB radio that contained a crystal for each of the 23channels, two extra slots existed, and one could order the 22A & 22B crystals for an easy plug-in. Aside from legal CB allocations and freebanding (or outbanding), there are several legal licensed services allocated to this interesting chunk of spectrum. [citation needed] Other early clubs were "LV" (Latrobe Valley) and "WB" (named after Wayne Britain). Using radios outside their intended market can be dangerous, as well as illegal, as frequencies used by Citizen's Band radios from other countries may operate on frequencies close to, or be used by, emergency services (for example, the Indonesian service around 142MHz operates on frequencies allocated to a public safety network shared with police, fire and EMS services in Ontario, Canada). Legal (shortrange) use of CB radio is sometimes impeded by users of illegal highpower transmitters, which can be heard hundreds of miles away. This page has been accessed 106,570 times. Frequencies, power levels and modes (such as frequency modulation (FM), amplitude modulation (AM), and single-sideband modulation (SSB), often vary from country to country; use of foreign equipment may be illegal. The loading coil may be on the bottom, middle, or top of the antenna, while some antennas are wound in a continuously-loaded helix. The 27MHz frequencies used by CB, which require a relatively long aerial and tend to propagate poorly indoors, discourage the use of handheld radios. 26.945 MHz AM - Lower channel for local nets, hunting clubs, AM DX, etc. The original FCC output power limitation for CB radios was "5watts DC input to the final amplifier stage", which was a reference to the earlier radios equipped with tubes. [6] There are several other classes of personal radio services for specialized purposes (such as remote control devices). The use of these radios within the Amateur Radio Service by a licensed Amateur Radio operator within his / her license privileges is legal, as long as all FCC regulations for Amateur Radio are followed. Superheterodyne receivers (using one or two conversion stages) were the norm in good-quality equipment, although low-cost toy-type units used super-regenerative receivers. New Zealand and Japan have unique allocations compared to any other country. Prefix Lists. 26.955 MHz AM - Channel 40 down one band, popular in USA for local radio nets, 27.025 MHz AM - CB channel 6 - The Superbowl -, 27.085 MHz AM - CB channel 11 - AM DX calling channel - the original calling channel from the 23 channel CB days, 27.125 MHz AM - CB channel 14 - often used as a local AM CB channel, also used for AM CB in Europe and UK, 27.135 MHz AM - Russian Trucker channel (see also 27.135 MHz FM, 27.180 MHz), 27.143 MHz CW - 14RS000 11 meter beacon CB beacon 27145 LSB 27140 USB 27.140 MHz USB 27.14245 MHz, 27.145 MHz LSB - 14RS000 beacon 11m beacon 11 meter beacon 27 MHz CW beacon 27.143 MHz, 27.165 MHz AM - CB channel 17 - often used as an alternate channel to 27.185/channel 19 for truckers, 27.185 MHz AM - CB channel 19 - trucker channel, road channel, interstate highways, probably the best spot to try first, 27.215 MHz AM - CB channel 21 - often used as an alternate channel to 27.185/channel 19 for truckers, 27.235 MHz FM - European packet PSK31 channel - channel 24, 27.235 MHz USB - Swedish and Nordic SSB calling Sweden, 27.235 MHz USB - European digital modes ROS data modes channel, 27.245 MHz FM - European packet PSK31 channel, 27.245 MHz USB - European digital modes ROS data modes channel, 27.255 MHz USB - WSPR weak signal digital modes 11m frequency (confirmed active July 2021), 27.255 MHz CW - 11 meter beacon 27 MHz beacon CB, 27.265 MHz AM - CB channel 26 - AM DX calling channel, see also: 27.025 AM, 27.085 AM, 27.285 AM, 27.275 MHz USB - UK SSB calling England mid band SSB frequency ch. I tend not to believe what I hear on the CB but this guy The bands are typically lettered A through F, with the normal citizens band as D. For example, a freebander with an export radio who wants to use 27.635MHz would choose channel19 (27.185MHz) and then shift the radio up one band (+450kHz). This is roughly 9feet (2.7m) tall; it is mounted low on the vehicle body, and often has a spring-and-ball mount to enhance its flexibility when scraping or striking overhead objects. While a SSB radio has three possible "modes" (AM, LSB, USB) it can operate in, operation is still limited to the same 40channels. S9s successor was Popular Communications, which had the same editor under a different publisher beginning in 1982. CB radio is not a worldwide, standardized radio service. [b] After the inter-station/intra-station rule was dropped, channel11 was reserved as a calling frequency (for the purpose of establishing communications); however, this was withdrawn in 1977. What the CB community generally refer to as the 11m band or freeband is considered to cover is 25 MHz to the beginning of 28 MHz although most activity happens around 26-28 MHz. They typically have a knob and display that reads up to channel40, but include an extra band selector that shifts all 40channels above or below the band and a "+10kHz" button to reach the model control "A"channels. Commonly there is 'tree' major types of different CB-Radio's Type 1: Uses channels to decide operating frequency. Feel free to login and start using our website to log your contacts on 27MHz. [39] The unofficial "travelers channel" in most of the world is channel19; in Australia it is channel8 (27.055MHz) and UHF channel40 (477.400MHz). A short-range simplex radio communications service for recreational use is from 477.5250 to 477.9875MHz FM mode with 38channels and a power output of 500mW. 27MHz radios have the advantage of not requiring a certificate of proficiency to use,[23] however they may not be monitored by rescue organisations or larger vessels. Originally, CB (named Citizens Radio by the Federal Communications Commission as of 1972) required the use of a callsign in addition to a purchased license ($20 in the early 1970s, reduced to $4 on March 1, 1975); however, when the CB craze was at its peak many people ignored the requirement and invented their own nicknames (known as "handles"). I have own Antron 99 imax2000 Maco v5000 . This falls close to the recommended 27.090 MHz to 27.150 MHz bands and the 27.120 MHz, 27.140 MHz, 27.141 MHz and 27.145 MHz frequencies. An unofficial citizens band radio club in Malaysia is the "Malaysia Boleh Citizen Radio Group", known as "Mike Bravo" (Malaysia Boleh).[32]. Further information: High frequency beacon, Part 15 beacons - 22m and 11m bands, and Part 95 Class C RCRS type systems that operate as de facto beacons on the six 26-28 MHz RC frequencies 26995, 27045, 27095, 27145 and 27255. Persons using illegal equipment or accessories still risk prosecution, fines or confiscation of equipment, although this is rarely enforced. RCRS was formerly known as the Class C Citizens Radio Service until the 1976 changes. [43] This restriction used to exist to keep CB as a local (line-of-sight) radio service; however, in the United States the restriction has been dropped. From the outset, the government attempted to regulate CB radio with license fees and call signs, but eventually they abandoned this approach. [24][25], In Canada, the General Radio Service uses the identical frequencies and modes as the United States citizens band, and no special provisions are required for either Canadians or Americans using CB gear while traveling across the border. The Indonesian government legalized CB on 6October 1980 with a decision by the Minister of Communications, the "Ministerial Decree on the Licensing for the Operation of Inter-Citizens Radio Communication". Two more channels between 22 & 23, commonly referred to as 22A & 22B, were available. Channel9 was officially reserved for emergency use by the FCC in 1969. Several people had 22A, but few had 22B. Many radios sold in South Africa feature both the 27MHz and 29MHz bands. Although the use of CB radios in the UK is limited they are still in use, especially with the farming community, truckers, off-roaders and mini-cab services.
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