Most car owners are aware of the existence of the so-called "trucker frequency", or otherwise, 27.135 MHz AM. This frequency has been serving as a universal "on-air meeting point" for many years for drivers - professionals, amateurs, auto travelers, etc. However, it is not the only radio frequency for communication of the motorized community - there are other means of communication of the driver's brotherhood for communication and mutual assistance - this is an auto channel in the LPD range, as well as the popular Zello Internet intercom. There is no secrecy in these methods of communication on the road, but not everyone knows about them. Let's try to fill in the gaps and, perhaps, give you a useful communication tool!
Distribution of LPD radio stations among the people and in cars
For starters, a short note. LPD is the civil license-free radio band, extending from 433.075 MHz to 434.775 MHz. The range is divided into 69 fixed frequency channels. The start of using LPD radios for car communications against the backdrop of the existence of a much more traditional and popular "long-range channel" of 27.135 MHz was caused by a number of objective factors.
Firstly , a sharply increased number of LPD radio stations in the hands of citizens - at some point (this moment, by the way, was noted about ten years ago!) It was possible to buy LPD radios in any communication salon very, very inexpensively. In the mid-2000s, one popular network of communication salons even gave a couple of simple "LPD-shek" appendage to Siemens "mobile phones" - and around these years the number of these radio stations in the hands of the population reached such values that their use ceased to be the lot of techies - amateurs - everyone used them, from children to housewives. Especially in view of the fact that cellular communication has not yet become completely and irrevocably cheap, as it is today. Accordingly, the superficial idea of using affordable and common walkie-talkies for communication between motorists was also realized. Secondly , the use of LPD in a car was favored by a much cleaner ether, in contrast to the 27-megahertz "long-range channel" - there were less industrial and atmospheric interference on VHF, and for the first time there was almost no multi-storey chauffeur swearing on LPD. Thirdly , LPD radios have extremely compact antennas - after all, the higher the frequency, the shorter the wavelength and, accordingly, the shorter the antenna - the 433 MHz antenna is much smaller than the 27 MHz antenna. That is, those who planned to be in touch with the auto channel always and stably could put a half-meter twig on the roof of the car as a full-fledged and uncompromising antenna, and not an almost three-meter whip with a huge magnet, like on CBS.
Emergence of LPD auto channel 433,100
The history of the origin and development of the Moscow LPD auto channel "Kolesam" was told by its creator and permanent coordinator named Yaroslav, better known on the Web under the nickname Mexico: - Matveevsky, etc. - Says Mexico, - At first everyone communicated directly on the same frequency of 433.100 MHz, as they say, "in a direct channel." Due to the low range of low-power portable radios, which was 1-2 kilometers on the ground at best, everyone could contact a limited number of other correspondents within his reach, but the saturation of the air was so high that there was always someone to talk to! Plus, there were correspondents on the air who turned on from home and were high up - they heard everyone, everyone heard them, and for the automotive community these people became some kind of unofficial voluntary dispatchers-coordinators, helping to transfer information and connect those who did not shout to each other. The population of the LPD air grew and grew, there were countless cases of real help from members of the auto channel to each other - and they actively reported traffic jams, ahead of Yandex maps, and drove out in an accident, pulled out those who got stuck, and rescued a car from under a collapsed tree - everything was over the years ... Communication in the auto channel introduced and made friends with a lot of people, first on the frequency, and then live - like many automotive communities, we gathered on Sparrow Hills, at first once a week, and then there was even a period when there were so many participants and this attracted people so much that meetings were held every evening in the summer!”"Repeater uniting"
“In 2008, it seems, the year, a repeater installed on a high-rise building in the Western District of Moscow started working on LPD, which became a serious evolutionary leap for the auto channel,” Yaroslav continues, “The repeater covering the whole of Moscow allowed those correspondents who were in a direct channel to communicate with each other. could not hear each other because of the distance. He, in fact, formed the previously absent radio infrastructure - with its help, people could hear each other and communicate from portable radios, being at different ends of the capital and even in the near Moscow region. The air of the auto channel was in full swing - the drivers helped each other, shared information and just talked while driving. It is interesting that the repeater, as is customary, worked with a frequency separation - reception on one frequency, and transmission on another. Accordingly, user radio stations had to support the frequency diversity mode - but practically not a single station from the “LPD-soap dishes” category from the cellular communication salon was able to work with diversity. This caused a massive upgrade of the equipment - but it did not give rise to big problems, because at that time there were already a lot of models of the so-called “Kitaenwoods” on the market - Chinese fakes of different models of Kenwood radios at a ridiculous price of 1-1.5 thousand, which also had a mode spacing, and many other useful functions - for example, working with subtones. The air became so dense that I had to wait to put in a word! But the close-knit and friendly community began to be destroyed by radio trolls, polluting the frequency with swearing and provocations, and actually jamming the work of the repeater. It was not possible to overcome them peacefully, and a couple of years after the launch, it was decided to turn off the repeater ...Internet links
A new wave of evolution of the LPD-car channel came with the advent of the so-called Internet links. Enthusiasts connected LPD radios to their home computer, connecting the microphone and speaker jacks to the sound card, resulting in a repeater - you walkie-talkie in the car, they switched on the transmission, said a phrase, you were received by an Internet link radio station with an antenna on a high-rise building and transmitted the voice stream via the Internet to other links that received it and again broadcast it in their area. As a result, thanks to several dozen Internet links, coverage of the entire city was provided - being in a car, say, in Chertanovo, one could easily talk with a correspondent from Khovrino ... And if trolls began to rampage on the air, then, since the signal went through several repeaters, it was not necessary to temporarily turn off the entire network, but only the link on the receiving frequency of which chaos began. At the frequencies of the autochannel, an autoinformer turned on with a certain frequency, which informed those who had just acquired a walkie-talkie and roamed the channels that they were on the frequency of the Moscow autochannel, and what they needed to join the community of car enthusiasts! The system of Internet links worked fine for several years, but in the end, due to the passion of the owners of the links with excess power, and because of the very principle of building a radio network, there were, so to speak, uh ... discrepancies with the legislative base in the field of radio communications. If you do not go into unnecessary nuances, the system of distributed Internet repeaters, having worked for several years, ceased to exist.Radio communication, gone to the Internet
As can be seen from the above story, the LPD autocanal, like any similar project, experienced ups and downs. At the moment, there is no infrastructure in the form of repeaters or Internet links, and the system works, as in "early Christian times" - in a direct channel, between correspondents located nearby. And due to the slightly reduced number of participants and the limited effectiveness of stations that do not have repeater support, the air is empty ... They helped keep the system alive mobile technologies- the autochannel community now communicates in the notorious "Internet walkie-talkie" Zello, where they call to each other and switch to over-the-air radio communication if it is discovered that someone from the community is nearby - say, in a nearby traffic jam. The people in the community are friendly and invite everyone to join - both with a Zello account and with an LPD radio station! Repeaters are radio signal amplifiers that improve the reception quality of radio stations in a certain area. These devices are used to enhance the signal quality in a radio communication system. In our online store Radio-Shop you can buy a repeater in Moscow at the most affordable prices.Our catalog contains a wide selection of repeaters from leading European manufacturers such as: Motorola, Kenwood, Icom, Vertex. These are multifunctional devices that provide consumers with the highest quality, convenient and reliable communication, regardless of the level of its complexity.
According to the type of equipment, repeaters can be active and passive.
- Active devices are transceiver radio repeaters, which are located at intermediate points of radio communication zones. They amplify incoming signals and transmit them further.
- Passive devices are repeaters that are designed to serve a communication network of a large number of lines with different frequency ranges of radio signals, since there is no mutual interference on such reflectors with linear qualities.
Such devices are widely used both by individuals and various government services and commercial organizations. They allow you to quickly solve the problem of "dead zones" that run along many highways and highways.
Their distinguishing feature is:
- ease of installation;
- offline work;
- high degree of reliability.
Range of repeaters
If simple radio stations and walkie-talkies have a limited range, then repeaters are used to increase it. In this case, these devices operate in a dual type - they receive and transmit a radio signal at the same time. In this case, the incoming signal is immediately cleared of various interferences and amplified several times, and then it is sent to another subscriber.Repeaters for portable or car radios tuned to two frequencies. One of them is tuned to receive a radio signal, and the second frequency to transmit it. To expand the range of the repeater, it is installed on the highest point indoors or outdoors. Also this device equipped with special reinforced antennas. In our Radio Shop online store you can buy a repeater in Moscow, as well as with delivery to any region of the country.
DiabloV 26.11.2009 - 15:56
In airsoft games, we use inexpensive 2-5 watt stations (LPD range - Midland GXT500-650, and frequency Kenwood 450S, etc.). In a hilly area, it is not possible to communicate even at 500 meters, being at the opposite foot of a high hill. So far, we are solving this problem by landing a person on the top of the hill - who works as a repeater - transmitting information back and forth.
The question is - what are inexpensive ways to automate this process? Maybe there are walkie-talkies with two transmitters that are capable of transmitting the received signal further on the fly ... I don’t know, my knowledge of radio communications is very modest ...
rt324 26.11.2009 - 17:13
Such devices are called a repeater and you will not be able to afford it.
The most inexpensive way to echo repeater.
Cons playback time (recorded - played back)
Plus it connects with headset connectors to any portable device and it works.
Himoza 26.11.2009 - 22:06
LPD radio stations will not be able to work through a repeater - they do not have spacing. A little hint for the topic starter: there is such a toy - an electronic parrot 😊 here you tie it to the LPD-shka and turn on VOX on it (automatic transmission when a voice appears) and everything is ok microphone amplifier, but here you need to be at least a little friendly with a soldering iron.
SthPhoenix 26.11.2009 - 22:26
Are there any ready-made solutions for direct connection of two walkie-talkies?
In principle, as I understand it, the device should essentially be an analogue of a headset with VOX, only in the audio input part, you need to put a plug instead of a microphone and match the input levels so that the amp does not clog.
I somehow tried to find ready-made samples or their circuits on the Internet, but something came across only echo repeaters, or fancy repeaters with support for DTMF, DCS and other functions, but I could not find an elementary cable with "vox" (
Himoza 26.11.2009 - 23:12
SthPhoenix
For example, in one walkie-talkie the plug is in the output jack, in the other walkie-talkie the plug is in the input jack, and, accordingly, one receives, immediately drives the sound through the audio output to the audio input of the other, it immediately transmits at a different frequency.
SthPhoenixAlmost all LPDs have a VOX function on board, i.e. for an echo repeater, you need to find one that has this mode. In this case, it is enough to simply connect the output of the station to the input of the parrot and vice versa. To do this, you need to buy a couple of connectors, a cable meter and two variable resistors. The issue price is 200-300 rubles.
In principle, as I understand it, the device should essentially be an analogue of a headset with VOX
Sth Phoenix 27.11.2009 - 12:21
Himoza
No solutions are even needed here - just a cord, but there are two "buts": Stations with a small spacing (maximum 1.7 MHz for LPD) will "shut up" i.e. the station that transmits will jam the station that receives. The second "but" - ordinary LPD-shki cannot work with spacing, then either switch to "chinese woods", or each player carries two stations, one for receiving, the other for transmitting.
In the case of LPDs, this is all true, I'm just thinking of using this method with a couple of old icoms at 144 MHz, which are lying around idle. There is no vox in them, so I’m thinking how to connect them with a cable ...
Himoza 27.11.2009 - 12:41
well, I think it's not a problem to solder a pair of transistors, resistors and a capacitor 😊
SthPhoenix 27.11.2009 - 03:15
Himoza
well, I think it’s not a problem to solder a pair of transistors, resistors and a capacitor
Heh, what's true is true, but there is always hope to find ready-made and not expensive 😊
Borman Martin 28.11.2009 - 12:19
That's what puzzled me, so this is an indestructible desire for "freebies")))
You buy fancy drives, smart tactical things like a radiculum under glasses and camouflage makeup, etc. but you can’t get a real connection))) Make a “Kulikov bomb” -2 “balalaikas” with a jack, wrap it with tape and turn on the VOKS on one (make different frequencies on both balalaikas, your kenwoods will allow you to work with a frequency spacing), this whole collective farm is a tree higher or command height and play war games)))
DiabloV 28.11.2009 - 13:51
Thank you for rating our wishes)
Option 2 walkie-talkies came to mind naturally the very first. We haven't tried it yet, but according to experience, 2 stations within a radius of 2-3 meters give strong backgrounds to each other in a wide frequency range. Yes, and the transmission is needed in both directions, how can one manage with one VOX.
Himoza 28.11.2009 - 19:01
Therefore, if you do it on a budget, then you need to do it on the basis of one station and a parrot
Borman Martin 28.11.2009 - 19:14
1 "parrot" ready is not a problem to buy with a budget of 1-1.5tyr.
DiabloV 28.11.2009 - 22:33
And where? I dug the Internet today. I found mention only of Parrot for more than 3000 rubles ....
Himoza 29.11.2009 - 12:18
a parrot costs less than a thousand, this is a toy in the form of a parrot 😊 sold in Moscow in all sorts of different markets.
Gagarin77 29.11.2009 - 01:00
DiabloVYour problem is not bending obstacles with shortwave radios. They cannot be solved in your format.
The question is - what are inexpensive ways to automate this process?
Waves of this range bend around the relief and thereby solve the problem. Cons: Louder antennas. We have almost the same problems. We're leaving Midland on higher quality radios. Kenwood was tested - the same shit is 2 times more expensive. The easiest option is to go with the Yaesu FT-60R. Yes, it's expensive, but the metal case and the ranges are what you need. You have a lot of equipment in the game and it is expensive, even though it will not be a toy. We have nothing but a flashlight for 2-3-4K, because a walkie-talkie for 7K is very expensive 😞 .
minorite 29.11.2009 - 01:40
Gagarin77ultrashortwave
shortwave radios
Gagarin77This is also not an option. Because:
The easiest way out for rough terrain is to leave the whole team on the 144 MHz band.
Gagarin77They don't bend. They also propagate in a straight line, like 70 cm waves.
Waves of this range bend around the relief
And, often, to bypass an obstacle in the form of uneven terrain (hills and pits, ravines), something like a repeater on a hill is required.
2 m better overcome obstacles such as trees (forest and vegetation in general), and for 70 cm this is a more serious obstacle (at the same time in the city, among reinforced concrete, 70 cm will work relatively better).
Well, some more nuances.
So it cannot be said unequivocally that 2 m will be better on rough terrain.
In the forest - yes, it will certainly be better.
DiabloV 29.11.2009 - 12:18
Gagarin77 29.11.2009 - 16:13
DiabloV😊 In short, the toad is still strangling us, but we still rarely run into it. This process is also highly developed in our country. But we don't go to Sweden either.
We need a repeater for a very rare case for a strike - a very mountainous area (Sweden). Height difference at a glance 100-150 meters. Play once a year. Buying walkie-talkies of a different frequency range for 10 people (and LPD is still widespread in the strike), and even quite expensive - for one game - is somehow cool for us. In Russian conditions, there are almost no problems with Midlands, and even more so with Kitaenwoods. Well, sometimes it doesn’t finish it from different parts of the training ground, but it’s so rare that we don’t feel the need to buy Yaesu for everyone.
We pose the question in the following way. If a person buys a walkie-talkie not only for games, then we advise him to take Yaesu. Yes, and players with experience realize that Midland is no longer rolling ...
Himoza 29.11.2009 - 17:49
Alternatively, when using LPD stations, you can do this: take two LPDs and connect them with a cord, put one on channel 1, the second on 69, both have VOX turned on, respectively, the players have half of the stations on channel 1, the second half on the 69th. You tie this repeater itself, with a good battery, on the highest possible tree in the center of the polygon, it is desirable to space the stations apart by a couple of meters. And everything works for everyone. There will even be a tactical interest - to work with a group that has a different channel only through a repeater. The only point is that stations for the repeater must be selected with receivers with relatively large dynamics, i.e. so that when transmitting to 69, the station turned on on channel 1 does not "shut up"
www.409shop.com The topic of repeaters will be raised many more times, so I think the Chinese will sell a lot of these things.
DiabloV 10.03.2010 - 11:42
Borman Martin 10.03.2010 - 15:42
I only pay for Russian mail.
Trebinje 10.03.2010 - 19:01
DiabloVYou see the price of the goods, this price is already with delivery to the Russian Federation ...
Uhhh. Can you elaborate on what free shipping means?
SprinterBRN 10.03.2010 - 21:34
Free means free. Some Chinese online stores that work with Russia and have, accordingly, a completely Russian interface, sell goods more expensive, and you also have to pay for delivery. Here you pay the price indicated on the site with a paypel, the parcel arrives at the post office after a while, you show your passport and pick it up. IMPORTANT - radios and other complex equipment must be ordered with delivery by Hong Kong airmail. The tracking number is still there, but if you order by ems (by express mail, selected when placing an order in the online store), then according to numerous reviews on the forums, various troubles occur in the form of superduper ems mail lagging behind the usual one for a long time, even More seriously, to ems shipments very close attention of customs. Some had to take away radio stations with papers for the call sign, knives with certificates that they were household goods, etc. So before you pay extra $15-20 for ems-delivery, you need to read about how these goods went through before and think hard.
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