Comparison Baofeng BF-888S Twin vs Baofeng BF-H7

The frequency range supported by the radio for both reception and transmission.

— CB (27 MHz). Abbreviation for "Citizens' Band" (sometimes spelled "Civil Band"), i.e. "civil range". One of the most widely used modern ranges, in particular in the CIS, in many countries CB radios do not require licensing. The technical features of the range are such that it is poorly suited for urban development, but provides good communication outside the city. As a result, such walkie-talkies are widely used in vehicles, especially among truck drivers — they allow you to exchange information at a distance of up to 5 km and warn other drivers about the traffic situation in advance. Also this range is used by many emergency services for direct reception of information.

— LPD (433 MHz). An abbreviation for "Low Power Device", which fully describes the features of walkie-talkies for this range. They have low power consumption and often do not require special batteries (ordinary batteries will do). At the same time, due to the high frequency, LPD models behave well in urban conditions, with dense buildings and an abundance of other sources of electromagnetic interference — the communication range can reach 2-3 km. This range is used mainly in Europe and the CIS, in many countries models for it do not require licensing.

— PMR (446 MHz). Abbreviation for "Private Mobile Radio" — "private walkie-tal...kie". This range is in many ways similar to LPD (see above): in particular, it is intended primarily for urban conditions, it is used mainly in Europe and the CIS, and walkie-talkies under PMR can be used without a license in many countries.

— FRS (462-467 MHz). It stands for "Family Radio Service", which is "walkie-talkie for family use." It is one of the varieties of the UHF band (see below), it has low power consumption on the one hand and relatively short range on the other. Generally refers to the "urban" bands, similar to LPD and PMR (see above), however, unlike them, it is used mainly in North and South America; in Europe and the CIS, such walkie-talkies require licensing at best, and in some countries they are generally prohibited for use.

— VHF. Abbreviation for "Very High Frequency" — "very high frequency", this range covers frequencies 134 – 174 MHz. VHF radios have good range and signal penetration, suitable for both urban and rough terrain, but such devices require a rather long antenna for reliable operation. As a result, VHF is widely used in professional radio communications, in particular maritime and taxi services, but in many countries such walkie-talkies can only be used after registration and/or obtaining a license.

— UHF. The "Ultra High Frequency" range is "super high frequency", most often this definition means frequencies of the order of 400 – 470 MHz. It is a kind of analogue of VHF: it is widely used in professional walkie-talkies and requires licensing in many countries. At the same time, UHF, due to its high frequency and short wavelength, has good penetration and does not require long antennas, which makes it more suitable for compact "city" type radios.

In addition to the above, it is worth noting two points regarding the licensing and registration of walkie-talkies of all ranges. Firstly, license-free conditions often describe not only the range, but also a number of other technical specs (primarily this concerns the power of the transmitter and the type of antenna, see more about both below). Secondly, in different countries (even within the same region), the legislation relating to radio communications can differ significantly — as a result, a model that is freely sold in one country may be subject to registration or even be banned from use in another. And for professional models, a license may be required not only for a walkie-talkie, but also for a specific frequency. Therefore, before purchasing a walkie-talkie, it makes sense to separately clarify the relevant provisions of the law.

The frequency range over which the walkie-talkie is capable of transmitting. This parameter is usually indicated if it does not completely match any of the standard radio operating ranges (see “Frequency Range”). For example, the transmission range is often specified for VHF and UHF models, as these bands themselves are quite wide, and individual walkie-talkies can only use a subset of these frequencies. The opposite option is also possible - wide-range models, whose specs go beyond the standards.

The frequency range in which the radio can receive transmissions. It is usually indicated if it does not coincide with one of the standard ranges of the radio; see "Transmission frequency range" for details.

The number of walkie-talkies in the standard delivery set, usually 1 or 2. Pairs are most often supplied for beginners and/or non-professional users: by purchasing such a kit, you immediately get everything you need for two-way radio communication. Very rarely there are sets for 3 or more walkie-talkies.

The maximum communication range that a walkie-talkie is capable of providing when used with the same model.

Speaking of range, note that usually its perfect value is indicated in the specs. And it is achieved only under a combination of certain conditions: the complete absence of obstacles (houses, trees, etc.) and interference in the passage of radio waves (for example, due to increased solar activity or the presence of powerful transmitters nearby), full battery charge, optimal air temperature , high-quality transceiver at the other end of the line, etc. In fact, the communication range, usually, is much lower. Therefore, when looking at this parameter, it is worth taking a certain margin.

The maximum power at which the radio transmitter is capable of operating. This parameter is one of the most important: it determines both the range of the device (see above) and the features of its use and registration (for more details, see "Frequency range"). For most models of the "amateur" (conditionally) class, the power level does not exceed 2.5 watts. More powerful walkie-talkies are, usually, professional models of the VHF and UHF bands (for more details, see "Frequency range").

Many modern walkie-talkies have several power settings, most often two — low (Low) and high (High). The first option is useful if the the other walkie-talkie is at a short distance: the transmitter will not consume excessive power, respectively, the battery will last longer. If the distance is large, you may need the “High” mode, in fact, the full power of the transmitter.

The number of channels on which the radio can operate. Each channel is essentially a fairly narrow subband within the main operating band (see "Frequency range"). The division into channels allows several groups of users to work simultaneously on the same territory and in the same range so as not to overlap on the air and not interfere with each other. The more channels provided in the design of the walkie-talkie, the more likely it is to find a free channel and the better it is suitable for working in conditions of intense extraneous radio traffic. This is especially important for powerful "long-range" models. At the same time, simultaneous operation of several groups on one channel is also possible thanks to subcodes (see below).

Single-channel walkie-talkies work on receiving and transmitting in only one channel, two-channel ones have 2 active channels in their arsenal, between which you can switch instantly at the touch of a button. The option with two active channels is suitable for communicating with two users who are not in contact with each other on different frequencies. In advanced models of two-channel walkie-talkies, dual-reception technology is also implemented with automatic switching of broadcasting to the channel on which the transmission is taking place.