These amateur radio repeaters provide a very valuable service to many stations, and in particular those that do not have particularly good locations or those amateur radio stations that are using only low power.
A repeater, whether an amateur radio repeater or even a commercial repeater is a station that receives a signal on one frequency and simultaneously re-transmits it on another. Repeaters are sited in good locations with good coverage enabling stations that can access the repeater to be heard on the output and thereby take advantage of the location of the repeater. Effectively it gives the low power amateur radio station the same coverage as that of the repeater.
In this way radio hams using small handheld transceivers, or those using mobile equipment in a motor vehicle are able to make many more contacts than they would otherwise be able to do. A ham radio repeater is essentially a relay station that receives a signal on one frequency and retransmits the audio on another. Although this sounds simple, amateur radio repeater stations have a number of automatically controlled functions to ensure that they operate efficiently and do not cause any unnecessary interference or radio spectrum pollution.
This means that when operating through an amateur radio repeater it is necessary to have a basic understanding of their operation so that it can be used to provide the most effective performance. Although the actual operation of a repeater will vary from one repeater to the next, and dependent upon the country in which it is operated, and sometimes the band which is being used, in general the overall concepts are the same. However, before venturing on to use a particular amateur radio repeater, it is best to monitor the station first to understand exactly how it operates.
Initially when a repeater is not in use it will not radiate a signal.
This will conserve power and also reduce possible interference. Amateur radio repeaters are also designed so that spurious signals and noise should also not cause the repeater to transmit.
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In order to "open" the repeater up there must be a signal on its receive or input frequency. This signal must be sufficiently strong for re-transmission and it must also have a tone to identify that the station being received at the repeater wants its transmission to be re-radiated. There are two methods of achieving this:. Once the repeater has been accessed, the audio from the incoming signal will be re-transmitted on the output frequency of the repeater.
However, if the signal falls below the required level the repeater may stop the signal from being re-transmitted - essentially if it becomes to noisy to provide good copy, the repeater will cease to re-radiate the signal.
Also many repeaters have a time out facility. This monitors the time a signal has been relayed and if a certain time has been exceeded then the repeater will go into a busy or time out mode and stop re-transmitting the signal. This facility is included on many amateur radio repeaters to discourage people from talking too long on the repeater.Repeater 101 for new Amateur Radio Operators
In this way it enables more people to use the repeater. When a transmission is complete the repeater will detect that the signal has disappeared from its input.
After a short delay many amateur radio repeaters will transmit an audio Morse character as an invitation for the next station to transmit. This character is often "K" - the Morse code character that is used to invite people to transmit. After the end of one transmission the timers are re-set and a new transmission can start. However, this time no tone burst is normally required to access the amateur radio repeater. Once a contact has been completed and there are no further transmissions appearing on its input, the ham radio repeater will close down.GMRS repeater channels access the extensive national network of repeater towers and can greatly increase the range of a GMRS radio, no matter the wattage.
Repeater towers act as both a radio receiver and transmitter, receiving low powered signals and then blasting them out with even more power and covering longer distances without degradation of the origin signal, allowing users to communicate clearly while miles apart. The advertised ranges of miles are based on direct line of sight and two way radio communication is greatly diminished when obstructions are present. In a dense urban area or hilly back country, a radio that has an advertised range of 32 miles may only reach a quarter to half mile.
With repeater channels, that range is maximized as long as the radio and user are within range of a repeater tower. Theoretically, one could broadcast a signal halfway across a large state like Texas when within range of repeater towers.
Rapid Deployment Portable Repeater
It is important to know that these towers are also privately owned and operated, so be sure to ask permission from the owner before using these towers.It is also compatible with GMRS repeaters. Channels are wideband and narrowband compatible. You can easily scan and select the tone needed to transmit and filter to hear only the conversations you want to hear! The GMRSX1 will save any modification to the channel even during a reboot and will remember any channel change you apply in any mode.
You can simplify the radio to only watch one or two channels as well. If you ever have an issue our team will be prompt, knowledgeable, and supportive; to ensure your radio operates exactly as it should.
You can mix and match tones for repeater usage. There is no guesswork involved anymore between brands. Even if other users don't know which privacy tone is being used on their GMRS radio; you are able to scan for which tone is being used.
This ensures easy compatibility with all brands. You must be licensed prior to transmitting. From the manufacturer.
Read More. First Name. Last Name. Please allow up to one business day for you RMA request to be reviewed and approved.Mounted in a small, mobile and durable pelican case, the repeater is man portable or can be mounted in a vehicle. The repeater connects any two radios of the same type to double their effective range, or up to three different types to function as a translator.
The KNG Baud Trunking option gives you the ability to communicate without hassle and without complication. Using our intuitive software, modifying your KNG Trunking features will be simple. Learn More. Over-the-air re-keying is an easy solution to efficiently change encryption keys. Completed almost effortlessly, encryption keys are changed over the air with a touch of a button. Longitude and latitude coordinates will give your exact location, or the location of another KNG, anywhere in the world, saving valuable time when calling for backup in emergency situations.
Multicast Vote Scan capable KNG Series radios automatically select the best site to operate from in a wide-area system. The KNG Radio scans all voted channels and selects the channel with the best signal. Custom-tailored user zones can be programmed into the KNG TMR and Portable Repeater by radio users and can also be field changed or reprogrammed whenever necessary.
Find an available channel for communications: scan channel, priority channel, or scan by zones, one zone at a time. Our intuitive menu system gives you full control. Fully customize the menu to fit your everyday needs.
Users sending text messages receive an acknowledgment that delivery of the message was successful. Text Messages can be sent radio-to-radio or can be repeated through fixed network equipment.
Day or night, get all the information you need right at your fingertips. The Keypad lock prevents you from accidentally hitting a button that may activate functions unintentionally. The version 1. It also provides enhanced audio signal conditioning which improves system performance in the presence of background noise.
Rapid Deployment Portable Repeater. Description Description. Key Features. BK Service. P25 Trunking. Multicast Vote Scan. Advanced Features. USB or Mobile Programmability.
Mixed-Mode Operation. APCO P Talk Around. Custom Menu System.We settled on an RS Pro 4U ventilated rackmount enclosure to house everything, as this should give us enough space with a little to spare, and can be neatly installed in a rack cabinet.
This comes supplied with a number of rails to which mounting plates can be attached and secured in place at varying height within the enclosure. Although at the present time we only require an RF connector each for transmit and receive, we decided to add a third just in case we needed it for future use. Internally we have a base plate laser cut from 5mm black acrylic, with one of the radios mounted to this, along with the MMDVM modem, a Raspberry Pi host and a length of DIN rail.
Two of the mounting rails supplied with the enclosure are then used to provide a higher level on which to mount the second radio via another laser cut acrylic plate, above the first radio. The DIN rail terminals together with the jumper bar will provide the basis for power distribution, with the relay switching this via front panel control. On the front panel we have a cut-out for the LCD which will display repeater status. This is secured to the inside front panel, which also has cut-outs to route cables through to the internal section.
The key switch will be used to supply 12V to the relay coil and in turn to power up the repeater, with the red LED wired as a power indicator.
One of the nice things about the enclosure is the supplied rails which can be mounted at varying heights, giving us more options for arranging everything. Previous experience has told us that you tend to need more space than originally anticipated and this is particularly true once you start adding things like USB cables, where the connectors can quickly use up a lot of space. Above you can see how we mounted the small LCD to the inside front panel, via four screws and small spacers.
Large holes were cut in this to route cables from front panel controls and indicators. Round holes up to 10mm or so are easily drilled and above this size we tend to use sheet metal punches, as these give a much more satisfying finish to hole cutters.
Although the hole for the fan in the rear panel was cut using a rather large hole saw. The key switch and LCD required a more unusual shape and a rectangle cutting out.
With all the components now secured in place in part 3 it will be time to move on to cabling. Hi Andrew bear in mind duty cycle with mobiles are now as good as dedicated base station also the front-ends on Motorola or any other mobile tend to have very wide front ends. The system may require a High-Q filter on the RX port in addition of the duplex er if locating this repeater on a commercial site thats has a lot of radio equipment on board radio tower.
Built something similar for commercial use a long time ago and it suffered this problem with front end overload,just something to bear in mind. Just thought id mention this when deploying the base station. Enjoyed article very good Rob.
The site is a church tower and I'm fairly sure there's no commercial equipment on there, but good point to raise and will obviously bear this in mind if that turns out not to be the case. How do you make it work - dmr on 2 analog radios, and with the motorola crypting? Andrew Back 3 Apr Components We settled on an RS Pro 4U ventilated rackmount enclosure to house everything, as this should give us enough space with a little to spare, and can be neatly installed in a rack cabinet.
Front panel On the front panel we have a cut-out for the LCD which will display repeater status. Fitting One of the nice things about the enclosure is the supplied rails which can be mounted at varying heights, giving us more options for arranging everything.
Next steps With all the components now secured in place in part 3 it will be time to move on to cabling. Andrew Back Follow. Open source hardware and software!In the world of modern communication there is an ever increasing need for providing higher outreach. The traditional Handheld Radios offer limited coverage area. However, a dedicated transceiver can help us achieve the requisite coverage.
A repeater is essentially a communication device which acts as a link between two radio operators to cover a large area. It is a two-way radio frequency communication system which receives a frequency from portable two-way radios, and re-transmits it at another frequency in real-time, albeit at a higher wattage than typical portable radios.
This mechanism allows repeaters to broadcast to a much wider reception spectrum. Additionally, two-way radio repeaters can communicate with all RF radio frequency receptors operating on the same RF channel. Since they use two different RF channels to carry the transmitted and received information frequencies, they can be truly bi-directional without any dependencies or interference with each other.
It can be further divided into two types:. Such devices are functional both on fixed RF channels or able to pick a physical RF channel for communication depending on pre-determined availability or channel assignment logic. Your portable radio, like the BCHor transceiver device is limited by factors which disallow high-quality radio frequency communication, unless a repeater is used to amplify the quality.
Two-way radios are available in several different configurations. Picking the appropriate system depends as much on your experience and needs. The popularly known configurations are: hand-held portable configurations BCHmobile BCM and base configurations. The frequencies used are also reliant on the requirements. Do remember, that line-of-sight communication is typically the strongest, while shadowing of buildings or natural obstruction will always cause some loss in transmission. Another frequently asked question is whether the preferred device of choice must be analog or digital.
Traditionally, analog devices have served the purposes of two-way repeater functions pretty well. Digital two-way repeater units come with some distinct advantages like:. To sum it up, this basic information could get you started with identifying the two-way radio repeater of your choice. There are other considerations like licensing your station, aligning with local operations, adjusting offsets and ID protocols while transmitting signals.
We shall join you there very soon! We need a dedicated repeater for our wind project in California. How much would a repeater with at least 5 radios cost?
We desert race and are looking for a repeater that we can use so we dont lose signal with our pits. Please advise on something that will work. View cart.
Repeater Basics: What is a 2-way radio repeater and how is it used? What is a Repeater? How it Works? Repeater components The prominent components of a two-way radio repeater as shown above are: Receiver — accepts the incoming signal. It is advisable to use a sensitive equipment to allow reception of even the weaker transmissions. Decoding of encrypted private-line PL signals occur here. Most receivers also employ a circuitry called Continuous Tone-Coded Squelch System CTCSS to mitigate tone squelch, or the annoyance of listening to other users on a shared communications channel, as it often happens for a two way radio.
The separation between the transmission and reception frequencies can range from kHZ to 5mHZ, depending on the bandwidth. It prevents the repeater from hearing itself or interference from its own source signals. Antenna — high-gain, high endurance, bi-directional antenna is used to both transmit and receive signals.
It is advisable to mount it at a significant elevation above ground level to steer clear of obstacles. Performance demands cause them to be pretty expensive.
Feed Line — low loss aluminum cables are typically used for antenna feed and signal reception from source.It improves portable radio coverage for police, fire and other emergency personnel by using the higher power of the mobile radio in the vehicle to extend the range of the portable back to the radio system.
The DVRS is also available as a standalone repeater for local repeat only. Motorola Solutions and Futurecom products enhance P25 coverage for law enforcement. Motorola Solutions and Futurecom products enhance P25 coverage on the fireground.
Communications simply cannot fail when lives are at stake and every second counts. These solutions are different by design and their proven, dependable performance in daily operations, countless storms, earthquakes and major public safety incidents underscores why purpose-built mission critical technologies matter. There simply is no substitute. Learn what is a DVRS and how can it be used to help first responders improve portable radio coverage.
See how the Province of Nova Scotia combine FutureCom and Motorola Solutions product to extend and strengthen coverage in remote areas of their jurisdiction. DVRS for Police. DVRS for Fire.
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