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Broadcast relay station
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- "Relay transmitter" redirects here. For other uses, see Relay (disambiguation) or Repeater (disambiguation).
A broadcast relay station, relay transmitter, broadcast translator (U.S.), rebroadcaster (Canada), or repeater (two-way radio) is a broadcast transmitter which relays or repeats the signal of another radio station or television station, usually to an area not covered by the signal of the originating station. They may serve, for example, to expand the broadcast range of a television or radio station beyond the primary signal's coverage area, or to improve service in a part of the main coverage area which receives a poor signal due to geographic constraints.
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Encyclopedia
- "Relay transmitter" redirects here. For other uses, see Relay (disambiguation) or Repeater (disambiguation).
A broadcast relay station, relay transmitter, broadcast translator (U.S.), rebroadcaster (Canada), or repeater (two-way radio) is a broadcast transmitter which relays or repeats the signal of another radio station or television station, usually to an area not covered by the signal of the originating station. They may serve, for example, to expand the broadcast range of a television or radio station beyond the primary signal's coverage area, or to improve service in a part of the main coverage area which receives a poor signal due to geographic constraints. They may be (but are not usually) used to create a single-frequency network.
Less commonly, a rebroadcaster may be owned by a community group rather than the owner of the primary station.
Types
Broadcast translators
In its simplest form, a broadcast translator is a facility created to receive a terrestrial broadcast station over-the-air on one frequency and rebroadcast the same or substantially-identical signal on another frequency. These stations are used in television and radio to cover areas (such as valleys or rural villages) not adequately covered by a station's main signal.
Boosters and distributed transmission
Relays which broadcast within or very near the parent station's coverage area (a "fill-in") on the same channel or frequency are called booster stations in the U.S. However, this can be tricky because it is possible to have both stations interfering with each other unless they are carefully designed. Radio interference can be avoided by using exact atomic time obtained from GPS satellites to perfectly synchronise co-channel stations, as in a single-frequency network.
US AM broadcasting stations do not have translators or boosters; though an SFN is actually easier to create in their frequency band, it is largely unnecessary as the longer wavelengths of these signals are more able to provide adequate coverage over longer distances despite a lack of line-of-sight transmission conditions.
Analog TV stations cannot have same-channel boosters unless opposite (perpendicular) polarisation is used, due to video synchronization issues such as ghosting. In the US, no new on-channel UHF signal boosters have been authorized since July 11, 1975.
Distributed transmission (DTx) is the use of several medium-power stations (usually digital) on the same frequency to cover a broadcast area, rather than one high-power station with any repeaters on a different frequency. Digital TV stations are technically capable of sharing a channel, however this is more difficult with the 8VSB modulation and invariable guard interval used in the ATSC standard than with COFDM used in the European and Australian DVB-T standard. A distributed transmission system would therefore have tight synchronisation requirements which require all transmitters to receive signal from one central source for broadcast at one exact GPS-synchronised time. DTS (or DTx) are not broadcast repeaters in the conventional sense as they cannot simply receive the signal of one main terrestrial broadcast transmitter for rebroadcast; to do so would introduce a retransmission delay which breaks the precise synchronisation required, causing interference between individual transmitters.
The use of virtual channels is another alternative, though this may cause the same channel to appear multiple times on a receiver (once for each relay station), and requires the user to tune manually to the best one (which changes due to radio propagation conditions like weather). Use of boosters or DTx instead causes all relay stations to ideally appear as a single signal, but requires significant broadcast engineering to work properly and not cause destructive interference to each other's signals.
Satellite stations
Some fully-licensed stations simply simulcast another station. These are relay stations only in name and are generally licensed the same as any other major station. This is not regulated in the U.S., and it is also widely allowed in Canada, which otherwise regulates radio formats to ensure a diverse variety of programming.
US satellite stations may request that the Federal Communications Commission grant an exemption to requirements that a properly-staffed broadcast studio be maintained in the city of license or (in rural states) that television programming be simulcast in both analogue and digital during digital television transition. These stations most often cover vast, sparsely-populated regions (an economic hardship) or are operated as statewide non-commercial educational radio and television systems.
Semi-satellites
A television rebroadcaster often sells local or regional advertising for broadcast only on the local transmitter, and may also air a very limited amount of distinct programming from their parent station. Some such "semi-satellites" broadcast their own local newscasts, or separate news segments during part of the newscast. For example, CHEX-TV-2 in Oshawa, Ontario airs separate daily late afternoon-early evening news and community broadcasts from its parent station, CHEX-TV in Peterborough, Ontario. The U.S. FCC prohibits this on FM translator stations, only allowing it on different fully-licensed stations.
National networks
Most broadcasters outside of North America maintain a national network and use several relay transmitters to provide the same service to a region or entire nation. In comparison to the other types of relays explained above, the transmitter network is often created and maintained by an independent authority, often paid for using license fees, and multiple major broadcasters use the same transmitters.
Relay transmitters by country
Canada
In Canada, rebroadcaster or rebroadcasting transmitter are the terms most commonly used by the Canadian Radio-television and Telecommunications Commission.
Television
A television rebroadcaster may be permitted to sell local or regional advertising for broadcast only on the local transmitter. On rarer occasions, they may also air a very limited amount of distinct programming from their parent station. Some such "semi-satellites" broadcast their own local newscasts, or separate news segments during part of the newscast.
There is no strict rule for the call sign of a television rebroadcaster. Some transmitters have distinct call signs from the parent station (for example, CFGC in Sudbury is a rebroadcaster of CIII), while others use the call sign of the originating station followed by a number (e.g., CBLFT-17 in Sarnia). Officially, the latter type includes the television station's TV suffix between the call sign and the number, although in media directories this is often left out for convenience.
In the latter case, the numbers are usually applied sequentially, starting from one and denoting the chronological order in which the station's rebroadcast transmitters began operation. Some broadcasters may, at their discretion, use a system in which the number denotes the actual broadcast channel of the transmitter (e.g., CJOH-TV-47 in Pembroke). A broadcaster cannot, however, mix the two numbering systems under a single call sign — the transmitters are either all numbered sequentially or all numbered by their analogue channel position. On the rare occasion that the sequential numbering reaches 99 (e.g., TVOntario's broadcast transmitters), rather than being numbered as 100 the next transmitter is assigned a new call sign and numbered as one. Translators which share the same frequency (such as CBLT's repeaters CBLET, CBLHT, CBLAT-2 and CH4113, all on channel 12) are also given distinct call signs.
Low-power rebroadcasters may also have a call sign which consists of the letters CH followed by four numbers. For example, CH2649 in Valemount is a rebroadcaster of Vancouver's CHAN. Rebroadcasters of this type are numbered strictly sequentially to the order in which they were licensed by the CRTC, and their call signs have no inherent relationship to those of the parent stations or of other rebroadcasters. Although the next number in the sequence, CH2650 in Anzac, is also a rebroadcaster of CHAN, this is simply because CH2649 and CH2650 happened to be licensed simultaneously — the following number, CH2651, is a rebroadcaster (also in Anzac) of Edmonton's CITV. A single station's rebroadcasters are not necessarily all named in the same manner. CBLT, for example, has some retransmitters which have their own call signs, some which use CBLT followed by a number and some transmitters with CH numbers.
Radio
As in television, a radio rebroadcaster may have either a distinct call sign or the call sign of the originating station followed by a numeric suffix. In the case of radio, however, the numeric suffix is always sequential.
For a rebroadcaster of an FM station, the numeric suffix is appended to the FM suffix. For example, rebroadcasters of CJBC-FM in Toronto are numbered CJBC-FM-1, CJBC-FM-2, etc. Where an AM station has a rebroadcaster operating on the FM band, the numeric suffix instead falls between the four-letter call sign and the FM suffix — for example, CKSB-1-FM is an FM rebroadcaster of the AM station CKSB, while CKSB-FM-1 would be a rebroadcaster of CKSB-FM.
As a broadcaster is limited to two FM and one AM station in a market, one possible means to obtain a third FM signal in-market is to use a rebroadcaster of the AM station to move that signal onto low-power FM. In Sarnia, Ontario, Blackburn Radio already owns CFGX-FM 99.9 and CHKS-FM 106.3; its third Sarnia station CHOK 1070 uses an FM repeater for in-city coverage as "Country 103.9" FM.
Low-power radio rebroadcasters may also have a call sign which consists of the letters VF followed by four numbers. Some stations licensed under the CRTC's experimental broadcasting guidelines, a special class of short-term license (similar to special temporary authority) sometimes granted to newer campus and community radio operations, may have another distinct class of call sign which consists of three letters from anywhere within Canada's ITU prefix range followed by three digits — e.g. CFU758 or VEK565. Some other stations within this license class, however, have been assigned conventional Cxxx call signs.
Occasionally, former rebroadcasters have been converted to originating stations in their own right, but have retained their former call sign instead of being reassigned a new one of their own. Such stations include CITE-FM-1 in Sherbrooke, CBF-FM-8 in Trois-Rivières and CBAF-FM-15 in Charlottetown.
Mexico
In Mexico, translator and booster stations are given the callsign of the parent station plus a sequential number, such as XHABC and XHABC1, XHABC2.
Television
The majority of full-power television stations in Mexico are operated as repeaters or semi-satellites of the major Televisa and TV Azteca stations in Mexico City; the largest of these repeater chains rebroadcasts XEW-TV programming on more than a hundred stations nationwide. The National Polytechnic Institute's Once TV and Monterey, Mexico-based Multimedios are also commonly rebroadcast nationally; individual Mexican states each operate a chain of full-power repeaters in-state to provide public educational television.
Full-power rebroadcasters are issued callsigns in the same manner as all other stations; the callsign itself does not identify the originating station. As there are four Televisa and three TV Azteca stations in Mexico City alone, ownership of an individual transmitter by one of these groups does not in and of itself identify which signal the station is rebroadcasting. Transmitters rebroadcasting México City stations into Baja California and other communities along the Pacific Ocean coast normally operate on a two-hour delay relative to the originating station.
The smallest repeaters are operated by municipal-level organisations; these bear standard callsigns and license but are registered to a local translator authority (typically «Patronato pro TV», «Comité Patronato Municipal pro TV» or «Comité Civil pro Ant. Retrans. de T.V.» followed by the name of a municipality) and licensed for small amounts of power - often operating at a hundred watts or less. The largest repeaters are full-power satellite stations operated by national networks Televisa and TV Azteca. There is no legal distinction between translators and originating stations.
United States
Radio
As of August 2007, the basic FCC regulations on translators are:
- No station may be translated to another band (i.e. from AM to FM) with an exception given if the translator is to be located in a "white area" where no full power AM or FM stations exist. However, the FCC is considering a rules change to allow more AMs to own and operate FM translators, and has issued a number of special temporary authority permits allowing such AM-to-FM translators in selected cases.
- No translator or booster may transmit anything other than the live simulcast of its licensed parent station, except for emergency warnings (such as EAS), and 30 seconds per hour of fundraising.
- The parent station must identify all of its translators and boosters between 7 and 9 a.m., between 12:55 and 1:05 p.m., and between 4 and 6 p.m. each broadcast day; or each must be equipped with its own automated device (audio or FSK) for hourly identification.
- Maximum power is 250 watts ERP for a translator, and 20% of the parent station's power for a booster.
- A translator or booster must go off the air if the parent station's signal is lost. (This helps prevent unauthorized retransmission of other stations).
There is one loophole by which programming may differ between a main station and an FM translator: an HD Radio signal may contain digital subchannels with different programming from the main analogue channel, and a translator may operate in such a way as to broadcast programming taken from the originating station's HD2 subchannel as the translator's main analogue signal. W237DE (95.3 Harrisburg, Pennsylvania) broadcasts the programming format formerly carried by WTCY AM 1400, but it actually gets this signal from a WNNK (104.1 FM) HD2 digital subchannel for analogue rebroadcast at the WNNK tower site on 95.3's main signal. As such, it technically is still legally an FM repeater of an FM station, even though each signal would be heard as delivering unique content by users of standard analogue FM radio receivers.
Commercial stations may not own their translators (except for boosters), or be translated outside of the parent station's area (they can only fill in where terrain blocks the signal). Thus, they operate by picking-up the signal of the main station off the air with a directional antenna and sensitive receiver, and directly retransmitting the signal. They also may not transmit in the FM "reserved band" from 88 to 92 MHz, where only noncommercial stations are allowed. Noncommercial stations may broadcast in the commercial band, however. Unlike commercial stations, they can also relay programming to translators via satellite, so long as those translators are in the reserved band. All stations may use any means to feed boosters.
All U.S. translator and booster stations are low-power and have a class D license, making them secondary to other stations (including the parent). They must accept any interference from full-power (100-watt or more on FM) stations, while not causing any of their own. Boosters must not interfere with the parent station within the community of license. Licenses are automatically renewed with that of the parent station and do not require separate applications, though each may still be challenged with a petition to deny.
FM booster stations are given the full callsign (always including an -FM suffix, even if there is none assigned) of the parent station, plus a serial number, such as WXYZ-FM1, WXYZ-FM2, etc.
FM translator stations may use sequential numbered callsigns, consisting of K or W, followed by a three-digit number (201 through 300 corresponding to frequencies 88.1 MHz - 107.9 MHz) followed by a pair of sequentially-assigned letters. The format is similar to that used by numbered TV translators, where the number refers to the permanent channel assignment.
As of October 2008 the largest terrestrial radio translator system in the US belongs to KUER-FM, the non-commercial radio outlet of the University of Utah, with 33 translator stations ranging from Idaho to New Mexico and Arizona.
Television
Unlike FM, LPTV stations may operate as either translators or originate their own programming.
Translator stations in the U.S. are given callsigns which begin with a W or K (respectively east or west of the Mississippi River, as with regular stations), followed by a channel number, and two serial letters for each channel. (The first stations on that channel are AA, AB, AC, and so on.) Television channels are always two-digit, from 02 to 83; while FM radio channels are from 200 (87.9 MHz) to 300 (107.9 MHz), one every 0.2 MHz. (Examples: W42BD, K263AF.) The presence of an X after the number in these callsigns does not indicate an experimental broadcasting license as it may in other services, as all 26 letters are included in the sequence. The highest pair of letters used, , is ZH (K13ZG and K13ZH are a pair of not-yet-active Texas rebroadcasters of Hispanic Christian Community Network).
Numbered translator stations (a format such as "W70ZZ") are typically low-power repeaters, often 100 watts or less on FM, and 1000 or less on TV. The former "translator band", UHF TV channels 70 through 83, was originally occupied primarily by these low-powered translators. The combination of low power and high frequencies provided a very limited range for these broadcasts. This band was reallocated to cellular telephone services in the 1980s, with the handful of remaining transmitters from these channels moved to lower frequencies.
Full-power repeaters (such as WPBS-TV's identical twin transmitter WNPI-TV) are normally assigned -TV callsigns like those of any other full-power station. They do not bear numbered callsigns and must operate in the same manner as other full-power broadcasters. This simulcasting is generally not regulated by the FCC.
LPTV stations may also choose a regular four-letter callsign with an -LP suffix (shared with LPFM) for analog or -LD for digital, generally done only if the station originates programming. Class A television stations get -CA and -CD instead. Digital stations which use numerals get a -D suffix (as in W42BD-D). All of these are despite the fact the full-power digital TV stations had their -DT (originally -HD) suffixes dropped by the FCC before -D and -LD were implemented. Digital LPTV stations have their digital RF channel numbers as part of their digital callsigns, which means it may be different from the virtual channel (the analog number).
Numbered broadcast translators which are moved permanently to another frequency are normally issued new callsigns to reflect the updated channel assignments. The same is not true of displaced translators using another frequency temporarily under special technical authority, For instance, K55KD could retain its callsign while displaced temporarily to channel 57 to resolve interference to MediaFLO users, while W81AA would have received new calls when channel 81 was deleted from the bandplan. On the rare occasion a station moves back to its original channel, it is given its old callsign, as they are not reused by other stations like regular callsigns can be.
Digital transition
LPTV operations are not required to simulcast a digital signal, nor to shutdown analog operation in June 2009 when full-power US TV operators must do so.
Full-power stations used to simulcast another station are, like other full-service television broadcasters, required to convert fully to digital in 2009. The FCC defines these "TV satellite stations" as "full-power broadcast stations authorized under Part 73 of the Commission’s rules to retransmit all or part of the programming of a parent station that is typically commonly owned." As most satellite stations operate in small or sparsely populated areas that have an insufficient economic base to support full-service operations, many are granted FCC authorisation on a case-by-case basis to flash-cut from analog to digital on the same channel instead of simulcasting in both formats during the digital transition.
, no current or future DTV mandates have been forced on LPTV stations, however Congress has passed legislation to provide immediate funding so these low-power stations can switch to digital on February 18, or shortly thereafter.
For many LPTV operations, the creation of digital companion channels for full-power stations has already required that the low-power station relocate to another frequency; once the digital transition is complete, additional LPTV broadcasters will be forced onto lower channels as channel 52 through 69 are removed from television use. Existing channel 55 licensees, both low-power and full-power, are being encouraged to relocate early to free spectrum for Qualcomm's MediaFLO transmitters.
Many low-power broadcast translators will also be directly affected by a parent station's conversion to digital television. Translators which now receive an analog over-the-air signal from a full-service TV station for rebroadcast will need to convert receive equipment in much the same way that individual viewers have needed to deploy digital converters. While the signal transmitted by the repeater may remain in analog format, the uplink will have changed. In the United States, 23% of the 4000 licensed translators have received a $1000 federal government subsidy which covers a small portion of the cost of this additional equipment. Many other translators are expected to simply go dark after digital transition.
Some small translators operate by direct conversion of a parent station's signal to another frequency for rebroadcast, without any other local signal processing or demodulation. For example, W07BA, a sixteen-watt repeater for Syracuse, New York broadcaster WSYR-TV, is by design a very simple piece of broadcast apparatus; it merely shifts the main station's signal from channel nine to channel seven to cover a small valley in Dewitt. After digital transition, Syracuse becomes a UHF island and WSYR-TV's main ABC signal a 100kW digital broadcast on channel seventeen. There will therefore be no channel nine signal in any format available to feed the tiny repeater. Translators in remote locations, where no commercial power is available, are also expected to have problems in deploying extra equipment to handle an uplink's digital conversion. While many translators will continue analog broadcasts (and a minority will transition to digital themselves), some distant rural communities do expect to find all local translator signals gone as a result of originating stations' transition to digital.
A digital-to-digital repeater or broadcast translator is possible; in North America the ATSC specifications allow such repeaters to leave the virtual channel numbering and guide (PSIP) of the originating station unchanged, so that the rebroadcaster appears to the viewer as if it were on the same channel numbers as the original station.
Most digital TV sets and digital video recorders include analog and digital tuners, however most DTV set-top boxes fail to display analog stations or even to include analog passthrough for RF from the TV antenna (the way a VCR does). This is an issue primarily with coupon-eligible converter boxes and cause for grave concern among LPTV operators and border stations; the Community Broadcasters Association has filed a lawsuit claiming it violated the All-Channel Receiver Act, the law on which the FCC based its digital mandate. However, as of late 2008, 58% of approved coupon-eligible converter models now provide analog passthrough.
Controversy
Under US law, full-service local broadcasters are the primary occupants of the FM radio broadcast band. All LPFM operations, as well as all translators, are considered to be secondary in importance. In theory, this leaves low-power FM stations and broadcast translators with co-equal status on the FM band. In practice, as the FM broadcast band becomes more crowded, frequencies assigned to translators become unavailable to new LPFM stations or to existing LPFM stations seeking to upgrade their facilities.
A few key distinctions often place small, local LPFM operators at a disadvantage:
- The maximum power for an LPFM station (either 10 or 100 watts, depending on class of station) is less than that of the largest FM broadcast translators (at 250 watts), limiting the reach of the LPFM signal.
- The minimum spacing required (in distance and frequency) to other stations is less strict for translators than for LPFM applicants. While the translator spacing is based on signal contour levels (and therefore takes terrain and obstacles into account), the LPFM stations have a more restrictive legally-defined minimum distance requirement.
- An LPFM broadcaster is required to generate local content; if there are multiple applicants for the same frequency, those who agree to originate eight or more hours a day of local programming are favoured. Translators are not required to (and are not licensed to) originate anything locally.
- LPFM licenses are normally issued to non-commercial educational entities (such as schools or municipalities) and are subject to strict requirements largely precluding multiple stations under common ownership. The same is not true of translators. A non-commercial translator with no local content and no educational content is free to occupy space even in the non-commercial segment (below 92 MHz) of the US FM broadcast band. During the narrow FCC filing windows for new applicants, multiple applications for broadcast translators from the same or related entities can be abused to request every locally-available frequency in multiple communities.
- An LPFM license or construction permit cannot lawfully be resold. The same is not true for translators. A few related entities can easily file applications for thousands of individual translator construction permits via automated means, using non-commercial status to gain exemption from any FCC filing fees, then resell these construction permits en masse or individually for thousands of dollars each - even if the corresponding transmitters have not yet been constructed.
Broadcast translators for commercial stations are normally required to receive a signal from their parent full-service FM station over-the-air and retransmit solely within the region covered by the main station. Due to a legal loophole, this same restriction does not apply to non-commercial entities. Any non-commercial station, even one with no local or educational content to offer, can apply for an unlimited number of translators anywhere to be fed by any means (including via satellite). The end result is a network of hundreds of small local transmitters, none of which broadcast (and none of which can lawfully broadcast) programming of interest to the local community. All take increasingly-scarce available spectrum which otherwise could have been employed by local LPFM stations or used for rebroadcast of local full-service stations.
Another related issue involves the use of full-power stations to carry automated or satellite-originated programming. Any new full-service station can displace an existing low-power translator or an independent LPFM station; regulations allow this on the presumption that the full-service broadcaster would be more likely to provide a local voice to the community of license. Not all full-service broadcasters live up to this expectation. In some cases (such as the displacement of existing National Public Radio repeaters by newly-created religious stations in Lake Charles, Louisiana) the result has been the loss of local or educational content. While an exactly-opposite outcome to that which legislative intent had anticipated, often a small non-commercial educational translator was carrying content of higher quality than a satellite-fed full-power station for which it is displaced.
Great Translator Invasion of 2003
An FCC licensing window for new translator applications in 2003 resulted in over 13,000 applications being filed, most of them coming from religious broadcasters. Due to the extremely high volume of license applications, LPFM advocates describe this as the Great Translator Invasion.
A few broadcasters have taken advantage of loopholes in FM repeater regulations which allow non-commercial stations to feed distant translators from satellite-delivered programming hundreds or even thousands of miles outside the parent station's coverage area. Eventually, the problem with "application spam" from "religiocasting" distant translator networks became sufficiently severe that the FCC issued an emergency hold order on new translator applications until the present batch can be sorted through; this came after considerable criticism from LPFM lobbyist groups such as Prometheus Radio.
Some religious broadcasting outlets — such as Calvary Chapel's KAWZ-Twin Falls, Idaho or Family Radio's KEAR-FM-Sacramento – are relayed by hundreds of FM "translator" stations across the US. As these parent stations are owned by non-profit organizations, they are not required to have their translators receive their signal over the air, as would be required for a commercial broadcaster. This particular loophole has been used by a number of religious broadcasters to set up large satellite-based networks composed almost entirely of "distant translators" – translators outside of the market area (generally a 50-mile radius surrounding the transmitter).
This has posed difficulties for non-translator station operators, in particular LPFM license applicants who often cannot get stations on the air due to translators eliminating any available channels in an area. Translators owned by "sat-casting" networks have also threatened the ability of existing LPFM licensees to expand their current station facilities and potentially leave LPFM stations who have been "bumped" from existing channel assignments by new full-power stations no available frequency to which to move.
There is at least one proposed rulemaking that would revise the procedures by which nonprofit groups may apply for translators (thus closing the "distant translator" loophole); in addition, the FCC has modified channel requirements for LPFM broadcasters to open up channel space. REC Networks has filed a petition with the FCC that would, among other things, require the FCC to give higher priority to LPFM stations.
Satellite translator networks
Areas with no available FM spectrum for LPFM stations due to large distant translator networks include Chicago (with several Calvary Chapel and Educational Media Foundation stations), Atlanta (with several Way-FM - associated with K-Love and Salem Communications - and Edgewater Broadcasting stations) and Dallas, Texas (with Calvary Satellite Network and American Family Radio). Even Louisville, Kentucky and Knoxville, Tennessee, both small market areas, have a complete lack of LPFM channels due to distant translator invasion by broadcasters such as Calvary Chapel and Way-FM.
The largest satellite-fed translator networks are endeavors linked to Calvary Chapel (including Radio Assist Ministries, Horizon Broadcasting, and (formerly) Edgewater Broadcasting and REACH Media) and American Family Radio owned by the American Family Association. The multiple networks associated with Calvary Chapel have been a particular focus in regard to translator-based networks. In many cases, multiple applications were submitted by different companies linked to Calvary Chapel in particular for the same channel. At least four separate radio stations operated by Calvary Chapel churches and relaying Calvary Satellite Network programming have been identified as "home stations" for distant translators and there are many home churches in addition to the main "national" Calvary Chapel concerns applying for licenses.
In the case of American Family Radio in particular, there are indications of a deliberate strategy to crowd out rebroadcasters of National Public Radio stations for political purposes.
Educational Media Foundation, owners of the K-Love contemporary Christian music radio network, have also been cited as applying for distant translators en masse.
Australia
Radio
Australia's national radio networks (Radio National, ABC NewsRadio, Triple J, ABC Classic FM and SBS Radio) each have relay transmitters which allow each service to be broadcast as widely as possible. In order to provide this, the ABC and SBS both allow community-based relay transmitters to rebroadcast radio or television in areas which would otherwise have no service. Commercial radio broadcasters normally have relay transmitters only if the local geography (such as mountainous terrain) prevents them from broadcasting to their entire market.
Television
Since market aggregation in the early 1990s, each television broadcaster transmits its service using multiple relays in order provide the same service throughout Australia's large market areas. While each market is often divided into submarkets due to the legacy of previous commercial broadcasts (for example, Southern Cross Ten maintains two separate stations in the single Victoria market, GLV and BCV), the only difference between these submarkets in practice is limited to news services or local advertising. Except in major cities, all major television broadcasters use the same network of transmitters, which may have dozens of relay stations in each market. As a result, some areas have had trouble starting digital or HD services due to problems with certain regional transmitters.
Europe
Because most radio and television systems in Europe are national networks, the entire radio or television system in some countries can be considered a collection of relay stations, in which each broadcaster uses a transmitter network (either developed by the public broadcaster or maintained through a government-funded authority) to provide broadcast services to the entire nation.
See also
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