Comparison REAL-EL X-703 vs REAL-EL X-700

A type of tuner used in radio receivers.

- Analogue. Tuning to the desired frequency in such tuners is carried out using the wheel. This scheme is considered more convenient than digital trim (see below), but the accuracy of analogue regulators is lower. This can make it difficult to use the receiver with numerous stations in a small frequency range (especially for FM broadcasts in large cities). In addition, the analogue tuner "does not know how" to memorize stations.

- Digital. The direct tuning of the tuner in such receivers is performed by an electronic circuit; the user only sets the desired frequency using the increase / decrease buttons or, in advanced models, from the numeric keypad. These tuners are somewhat less convenient for manual tuning, but they do a good job of fine tuning. Also, many receivers with digital tuners have the function of storing stations (see "Station Memory"), automatically searching for all available stations, etc.

— FM. The most popular broadcasting range among radio listeners today is primarily due to the fact that the vast majority of music stations broadcast in it. This is due to its features: FM uses frequency modulation, which makes it possible to broadcast sound with a fairly high sound quality, and even in stereo format. In the frequency band, the term "FM" usually refers to the 87.5 MHz to 108 MHz portion of the VHF band, although the range of individual receivers may vary. The disadvantage of FM is the limited range — within the line of sight (up to several tens of kilometers), which has secured the reputation of "urban" stations for FM stations.

— AM. Formally, this designation is not a range, but a type of modulation: "amplitude modulation" — amplitude modulation. In consumer radios, AM most often means the medium wave range of about 520-1610 kHz. Such waves have a propagation range of hundreds of kilometers, but the sound quality in this case is somewhat worse than that of FM, and therefore the AM band is mainly used by radio stations of the “conversational” genre (for example, news or journalistic).

— SW. Broadcasting on short waves (short wave) in the general range from 2.5 MHz to 26.1 MHz, divided into a number of separate sub-bands. Sound quality is average. Short waves are able to reach the opposite side of the Earth, but immediately outside the line of sight of the transmitter, a “dead zone” is formed, sever...al tens of kilometers wide. As a consequence, SW is commonly used for overseas broadcasts.

— DAB. Abbreviation for Digital Audio Broadcasting, i.e. "digital broadcasting". This term describes the key difference between this range and those described above: broadcasting in it is carried out not in analogue, but in digital format, the MP2 codec is used for transmission. This gives a number of advantages over traditional transmitters — in particular, a greater range with less power and high quality of the broadcast sound. In addition, this sound is practically not subject to distortion: weak interference does not affect its quality, and when the transmitter power is critically reduced, the signal is not distorted, but disappears entirely. The latter, however, can be written down as disadvantages; but the really significant drawback of this option is perhaps its low prevalence (so far) in the CIS countries. Technically, such broadcasting can be carried out in any band above 30 MHz, but in fact several options are used (depending on the country) related to the VHF band.

— DAB+. An updated and improved version of the DAB standard described above. It has all the characteristic features of digital broadcasting, and differs from its predecessor in higher sound quality at the same bit rates — both due to the use of a different codec (HE-AAC v2), and due to the use of more advanced noise correction algorithms. DAB+ broadcasts cannot be received on DAB receivers: at best, this will require a firmware update, and at worst, you will have to change the receiver itself.

The maximum power output of the receiver speaker(s) in normal operation, without overload. The higher the rated power, the higher the sound volume, but louder devices and energy require more.

Theoretically, a higher capacity allows for greater autonomy, but in practice, operating time also depends on power consumption - and it can be very different, depending on the characteristics and design features.