Here we have collected some links to building instructions for 11m antennas on the Internet. Attempts by law-abiding CB users to increase regulatory oversight have been ineffective. On September 11, 1958[3]:14 CB service classD was created on 27MHz, and this band became what is commonly known today as "Citizens Band". [14] Most highway travelers monitor channel19. In times of high sunspot activity, the band can remain open to much of the world for long periods of time. Drivers (especially commercial truckers) used CB radios to locate service stations with better supplies of fuel, to notify other drivers of speed traps, and to organize blockades and convoys in a 1974 strike protesting the new speed limit and other trucking regulations. Although this band belongs to the same HF as the 10m band, it is often used for FM broadcasting instead of the SSB communication similar to the 10m band. Majority of countries require no license to operate the radio service. Operation on frequencies above or below the citizens band (on the "uppers" or "lowers") is called "freebanding" or "outbanding". A typical citizen band radio service is a two-way radio system that can be used for personal or business communication. Common freeband frequencies include: See also: data link, telemetry, telecommand and long range wireless control, pager systems, on-site paging and hospital paging systems on 11 meters 26 MHz band 27 MHz band list here and here. [e] The RCRS service is commonly used for remote control of model aircraft and boats. This causes interference to the authorized low-power 1Watt DSB (1Watt AM) fishery radio service. At that time in Australia, licensed ham operators and Emergency Services still used the 11 meter band[17] which was not yet available for CB use. Many types of amateur transceivers may be found on CB and freeband, ranging from full-coverage HF transceivers to simpler 10meter mobile radios. The most well known and used on-line QSL database for the 11meter / freebander community is QRZ11.COM, designed after its "big brother" QRZ.com for amateur radio.[47][48][49][50][51][52]. Novice and Technician licensees outside ITU Region 2 may use CW only between 7.025 and 7.075 MHz and between 7.100 and 7.125 MHz. In the early 2000s, National Communications Magazine added CB radio coverage to its coverage of scanner radios and still remains the only magazine in North America covering CB radio. Citizen's Band (CB) 26 - 27 MHz (HF), 11 Meter Band, 40 Channels. Frequency selection resembles that of modified American CBs more than any foreign frequency plan. CB ClassB is a more distant ancestor of the Family Radio Service. At the beginning of the CB radio service, transmitters and receivers used vacuum tubes; solid-state transmitters were not widely available until 1965, after the introduction of RF power-transistors. Building and experimenting with antennas can be an interesting part of the radio hobby. The next improvement came during the mid-1970s; crystal synthesis was replaced by PLL technology using ICs, enabling 40channel sets with only one crystal (10.240MHz). Business caught on to this market, and introduced marine CBs containing a weather band (WX). re-assigned on September 11, 1958 for CB use effective October 1, 2024 to promote an all digital transmission band. However voluntary donations are welcome, to cover costs for running and maintaining the system. Marketing, import and sale of such radios is illegal if they are distributed as anything other than Amateur Radio transceivers. 7.200 to . CB Radio information on 11-Meters Band at 27Mhz. Skip contributes to noise on CB frequencies. Initially, CB channels13 remained allocated to amateur radio and channel23 was used by paging services. 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. 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. The FCC simply rounded up the old "5watts DC input to the final amplifier stage" specification to the new "4watts output as measured at the antenna connector on the back of the radio", resulting in a far simpler and easier specification. The FCC restricts channel9 to emergency communications and roadside assistance. In radios with more then 40 channels they are divided into 'bands' consisting of 40-80 channels. Freeband 11 Meter Frequencies and Bands While some export radios - sold as 10 meter radios - often cover frequencies above and below the 25.615-28.305 MHz range, that is the de facto "standard" export band alphanumeric plan. With the earliest sets two quartz crystals were needed for transmitting and receiving on each channel, which was costly. Two antennas may be installed for symmetrical appearance, with only one connected. except channel9, which was usually colored red. The United Kingdom has an additional 40channels between 27.60125 and 27.99125MHz, also making 80channels in total. SE-6MB Moxon CB band Dipole Antenna for 11 Meters - Half-Wave- with internal 1:1 choke Brand New $69.86 radioman79 (5,253) 100% Buy It Now Free shipping 54 sold Sponsored NEW COBRA 29 LTD CLASSIC CB RADIO New (Other) $143.99 ktinsley5150 (669) 99.3% Was: $179.99 20% off or Best Offer +$33.05 shipping Sponsored On 27June 2014, changes were made by Ofcom to allow the use of AM & SSB modes on CB in the UK legally for the first time. Technology such as mobile telephones and the internet have provided people with other choices for communications. AM mode is the only mode permitted and antennas must be non-removable and less than 199cm (78inches) long. During the 1970s, the FCC banned the sale of linear amplifiers capable of operation from 24 to 35MHz to discourage their use on the CB band, although the use of highpower amplifiers continued. RCRS was formerly known as the Class C Citizens Radio Service until the 1976 changes. The terms "interstation" and "intrastation" appear in the FCC's Part95 rules from that time period. Many freeband operators use amateur radios modified to transmit out of band, which is illegal in some countries. Where a nine-foot whip is undesirable, shorter antennas include loading coils to make the antenna impedance the same as a physically longer antenna. The following chart shows the 11 metre band division numbers that are internationally agreed by DX organisations. 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). These services began in 1945 to permit citizens a radio band for personal communication (e.g., radio-controlled model airplanes and family and business communications). Depending on the browser you use, you might need to adjust the print size in the print preview window for best results. 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. CB is still commonly used by long-haul truck drivers to communicate directions, traffic problems and other relevant matters. MaxOptimizer allows you to choose between a balanced 10 -11 meter antenna that will perform well in both bands or optimize the antenna for the 11 meter band. It is an unofficial practice to name these channels by their next lower standard channel number along with a suffix"A" (after). This agreement provides interference-free operation for all operators by separating the far more powerful SSB stations from the AM stations. 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. 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. 11 meter is often used by freebanders or CB operators using the "freeband" frequencies from between 25 MHz or 26 MHz and CB channel 1 (26.965 MHz) and CB channel 40 (27.405 MHz) and the bottom edge of the 10 meter amateur band (28.000 MHz). 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"). Text is available under the Creative Commons Attribution-ShareAlike License 3. . 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. For example, (C9EF, C9F, C9RF), end the used modulation (FM) or (F), (AM) or (A). After the 1973 oil crisis, the U.S. government imposed a nationwide 55 mph speed limit, and fuel shortages and rationing were widespread. The legality of shooting skip is not an issue in most other countries. This includes fishing net radio location beacons, paging services, on site or on campus pagers, 26 MHz hospital pagers, telemetry and data link networks, government, military, HF marine and FM land mobile. Over the next several years antenna regulations were relaxed, with antenna length increasing to 1.65meters (5'5") and centre- or top-loading of the main radiating element permitted. [citation needed] Other early clubs were "LV" (Latrobe Valley) and "WB" (named after Wayne Britain). In addition, CB may have become a victim of its own popularity; with millions of users on a finite number of frequencies during the mid-to-late 1970s and early 1980s, channels often were noisy and communication difficult, which reduced interest among hobbyists. Members of the CBTCC formed what became known as Australian Citizens Radio Movement (ACRM) in the early 1970s; this organization became the voice for legalization of CB radio throughout Australia. These kits are designed to have a mobile whip screwed on top (a full-length, quarter-wave steel whip is preferred) and mounted on a mast. Unlike amateur radios with continuous frequency tuning, CBs manufactured for export are channelized. With the FCC's minimal enforcement of its CB rules, enthusiasts in the US use "export radios" or European frequency modulation (FM) CB gear to escape the crowded AM channels. This helped prevent overcrowding on channel11, enabling a CBer to monitor a town's home channel to contact another CBer from that town instead of a making a general call on channel11. CB Radios operate on the 11 Meter Band between 26.965 MHz and 27.405 MHz w ith 40 channels. In September 2021 the FCC approved the use of FM on CB radio. shortwave) band. Starting in October 2021 the FCC has approved FM for CB in the US. [15][16] By the mid-1970s, hobbyists were experimenting with handheld radios and unauthorized 23channel American CB radios. 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). The 11-Meter band 2012-06-07 07:14 Admin Registered: 13 years ago Posts: 1,059 Dear operators. Kanava-taajuustaulukko-10-ja-11-metrin-radioille.pdf. New Zealand has adopted the Australian UHF CB System as well.[37]. [12]:120 During this early period, many CB radios had "inter-station" channels colored on their dials, while the other channels were clear or normally colored. A callbook is a directory of radio station call signs. For each band, only those license classes with privileges on that band are listed. . Japan's CB allocation consists of 8voice and 2radio control channels with a maximum power output of 500mW. Paging is permitted on channel1 (26.965MHz) and channel80 (26.955MHz) is the recommended call channel for Czech CB radio operators. The 27MHz frequencies used by CB, which require a relatively long aerial and tend to propagate poorly indoors, discourage the use of handheld radios. Another mobile antenna is the continuously-loaded half-wave version. HYS Tactical Foldable CB 11Meter 27Mhz 20W BNC 31.1inch Antenna with Adjustable Gooseneck for Cobra HH50WXST HH50 MRHH350FLT C75WXST Midland 75-822 75-785 MHS75 Uniden BC75XLT PRO401HH BC125AT 6 $1599 FREE delivery Sat, Apr 22 on $25 of items shipped by Amazon Or fastest delivery Tue, Apr 18 Only 6 left in stock - order soon. [8] The radios were crucial for independent truckers; many were paid by the mile, and the 55mph speed limit lowered their productivity. Just keep in mind that, even for CB Radios, the FCC requires users to follow certain codes of conduct and equipment restrictions. Russian CB allocations follow the CB band 26.96527.405MHz (designated as bandC), as well as 26.51526.955MHz (designated as bandB) and 27.41527.855MHz (designated as bandD). [3]:13 Originally designed for use by the public sector, the Citizens Radio Corporation sold over 100,000 units, primarily to farmers and the US Coast Guard.[4]. Manufacturers report an increase in sales, while social media sites like Youtube show a growing popularity in CB radio content, mainly as a hobby. 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. The callsign with which you registered. In Australia, CB Action Magazine was produced monthly from mid-1977 and continuing publication through until the early 1990s. Recommended beacon frequencies for 11 meter band - +/- 5 kHz or sofor example, 27.140 MHz / 27140 has two active beacons nearby on 27.1408 MHz 27140.8 kHz and 27.1416 MHz 27141.6 MHz. (C9EFM, C9EF, C9EAM, C9EA), 27.144MHz Japanese CB Channel 8 Calling Channel, 27.048MHz Japanese Remote Control R/C Frequency, 27.136MHz Japanese Remote Control R/C Frequency, 27.152MHz Japanese Remote Control R/C Frequency, RF gain: Adjusts the RF amplifier gain of the receiver; used to reduce received background noise, and to reduce "clipping" due to over-amplification of already-strong signals (for example, when the receiver is near the transmitter), NOR / 9 / 19: Quickly tunes preset channels for calling or emergency use, Echo mic: Deliberately introduces distortion and echo into transmitted audio, This page was last edited on 1 May 2023, at 16:35. 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. [3]:174 On some newer radios, the modification may be as simple as disconnecting a jumper wire or a diode. To mirror the 22 meter band or 13.560 MHz 13560 kHz Part 15 band 13.553 MHz - 13.567 MHz (second harmonic, center frequency 27.120 MHz - most popular 22 meter beacons operate on on 13554 kHz - 13559 kHz and 13562 kHz - 13566 kHz. Citizen Band Radio-What is it? My first attempt at making a CB radio antenna for the 11 meter band. Part of the 11 m/27 MHz band was also allocated in many countries for early-model cordless phones . The radio is normally in receive mode to receive transmissions of other radios on the channel; when users want to talk they press a "push to talk" button on their radio, which turns on their transmitter. what are some good models of used ham radios that can be converted to 11 meters and work on AM as well as SSB ? 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. The normal calling and truckers' channel is channel 19, although many truck organisations and groups use other channels to avoid abuse. They do not require a ground plane to present a near-50ohm load to the radio, and are often used on fiberglass vehicles such as snowmobiles or boats. We know that according to the frequency band, the 11-meter band refers to the 25000-28000 kHz or 26-28 MHz / 26000-28000kHz frequency band, and sometimes refers to the 25670 kHz to 26100 kHz. This is my first antenna project in the year of 2000 at the time i was active on 'Free-Band' 11 meter with some nice 'DXing', The original design is to be found on the internet, i do not remember the URL. The old specification was often used in false advertising by some manufacturers who would claim their CB radios had "5watts" long after the specification had changed to 4watts output. Part95 of the Code of Federal Regulations regulates the classD CB service, on the 27MHz band, since the 1970s and continuing today. The prominence of CB radio grew in Britain partly due to the success of novelty songs like C.W. To Optimize for 11 meter performance assemble the antenna with the 12" optimizer section installed between the mid and top section as a 4 piece antenna. These frequencies may have evolved because tuned circuits (particularly antennas) work best in the middle of the band; the frequency for channel19 (not channel20) is the center of the 40channel US band and other things being equal, signals will be transmitted and heard the farthest. Like many other land mobile radio services, multiple radios in a local area share a single frequency channel, but only one can transmit at a time. All frequencies in the HF spectrum (330MHz) can be refracted by charged ions in the ionosphere. The dates are hard to confirm accurately, but early use was known around large cities such as Jakarta, Bandung, Yogyakarta, Surabaya and Medan. The regulations called for one licence per CB radio. These roughly corresponded to the present channels522, except for the two unique frequencies that are known as 11A (Channel7 on an 18channel Australian CB) and 19A (Channel16 on an 18channel Australian CB) or remote control frequencies but are no longer part of the Australian 27MHz CB band since 40Channels were introduced. In Russia and Poland, the channels are shifted 5kHz down; for example, channel30 is 27.300MHz. When looking at the FCC/CEPT channel list there are some channels with a spacing of 20kHz instead of the regular 10kHz step. By the late 1960s, advances in solid-state electronics allowed the weight, size, and cost of the radios to fall, giving the public access to a communications medium previously only available to specialists. In the Philippines, up to present time, the use of 27MHz CB is still banned since the Marcos regime banned it in 1980s. 11DX.net is a privately operated, non-commercial web service for 11 meter operators run by an independent group of 11 meter operators. The technology has also given way to more compact CB radios with far more features afforded in older models. Citizen band radio is a short distance radio communication system that operates within a selected range of forty channels. Some links may be affiliate links. Most CB radios sold in the United States have the following features: 27MHz is a relatively long wavelength for mobile communications, and the choice of antenna has a considerable impact on the performance of a CB radio. ClassB radios had simpler technical requirements, and were limited to a smaller frequency range. To achieve this effect, the antennas must be separated by about eight feet, only practical on large trucks. With the original 23CB channels SSB stations commonly used channel16, to avoid interference to those using AM (SSB stations are authorized to use 12watts, as opposed to 4watts for AM stations) and to more easily locate other SSB stations. The Multi-Use Radio Service is another two-way radio service in the VHF high band. Modern Electrics published the first callbook in the United States in 1909. Under this class assignment, a CB radio is classified as a "Personal Radio Service device". For your convenience we have added also pdf versions of the charts available for download: Channel-Frequency-Chart-for-10-and-11-Meter-Radios.pdf. 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. From the outset, the government attempted to regulate CB radio with license fees and call signs, but eventually they abandoned this approach. American CB licensees were initially required to apply for a temporary license to operate in Canada. Channel9 was officially reserved for emergency use by the FCC in 1969. 27.125 is another very popular frequency for beacons 27.125 beacon 27.125 MHz beacon. I'm 37 years old and have own a lot of deffrent ground plan antennas. [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. 2200 Meters When it comes to Ham Radio, the only official LF band is 2200 meters. Unlike the 10 Meter Band, access to these frequencies are unrestricted by the FCC, hence the name "Citizen's Band". However, frequencies such as 27.005MHz AM are widely pirated in Japan with very high power transmitters. The original channels1, 2, 3, 4, 10, 21 and 23 were deleted from the 18channel band plan. In some instances, the sale or ownership of foreign-specification CB gear is not illegal but its use is. 11DX.net is free to use. A license from ICASA is required to purchase or use a CB radio in South Africa. Breaker! South Africa also permits use of standard CB channels1927 (27.18527.275MHz) with AM / SSB permitted. Multiple CB clubs had formed by this time, which assigned call signs to members, exchanged QSL cards, and lobbied for the legalisation of CB. 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. Several channels are allocated for maritime use in Australia. Multiple countries have created similar radio services, with varying technical standards and requirements for licensing. During low sunspot activity it may be impossible to use skywave at all, except during periods of Sporadic-E propagation (from late spring through mid-summer). Early receivers did not cover all the channels of the service; channels were controlled by plug-in quartz crystals, with one of several operating frequencies selected by a panel control in more expensive units. The General Radio Service was authorized in 1962. With the FCC authorization of 40channels, SSB operation shifted to channels3640. [g] While frequencies just below the CB segment (or between the CB segment and the amateur radio 10-meter band) seem quiet and under-utilized, they are allocated to other radio services (including government agencies) and unauthorized operation on them is illegal. However, I was listening to a guy on the CB and he said he was a trucker and was using a 10 meter amplifier. What are the freeband CB frequencies? So channel 1 on an 18 channel was actually channel5 on a 23channel radio. [40] Lax enforcement enables manufacturers of illegal linear amplifiers to openly advertise their products; many CB dealers include these amplifiers in their catalogs. There was much controversy over whether the Coast Guard should monitor CB radio, but for safety they did so, using Motorola base stations at their search and rescue stations. Frequency: Ch. Used mostly by truckers and some off road clubs (4WD) Not extremely reliable, gets pretty crowded on the channels and the language on there can be pretty offensive at times. A common mobile antenna is a quarter-wave vertical whip. 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". In 1948, the original CB radios were designed for operation on the 460470MHz UHF band. Voice actor Mel Blanc was also an active CB operator, often using "Bugs" or "Daffy" as his handle and talking on the air in the Los Angeles area in one of his many voice characters. Channel9 is reserved for emergencies, and channel11 for calling. With solid state radios becoming more common in the 1970s, the FCC revised this specification at the same time the authorized channels were increased to 40. Older amateur radios may require component changes; for instance, the 1970s Yaesu FT-101 was modified for CB by replacing a set of crystals used to tune portions of the 10meter band, although some variants of the FT-101 were sold with the US FCC channels standard and were capable of transmitting above and below the legal 40channels by another 10or more channels. However, many countries have adopted the American channels and their associated frequencies, which is generally in AM mode except some higher channels which are sometimes in SSB mode. Some manufacturers tried to sell more radios by claiming that with three different modes possible for each channel, it was the equivalent to 120channels.
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