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Полнодиапазонный радиоприемник DSP Pcket портативный динамик полноканальный с
Описание товара
● Frequency range / tuning step—— FM (FM)76 — 108 MHz ; intelligent stepping 0.01/0.1 MHzOptional frequency coverage:Standard: 87 — 108 MHzGermany: 87.5 — 108 MHzJapan: 76 — 108 MHz (including some campus broadcasts and domestic 4-5 channel TV sounds)—— Short wave (SW)2300 — 21950 kHz; Smart Step 1/5 kHz—— Zhongbo (MW)522 — 1620 kHz; intelligent stepping 1/9 kHz (for Asia, Africa and Europe)520 — 1710 kHz; intelligent stepping 1/10 kHz (for North America)150 — 1620 kHz ; (covers long waves) intelligent stepping 1/9 kHz● Noise limit sensitivity:Frequency Modulation (FM) (S/N=30dB) better than 3 uVMedium wave (MW) (S/N=26dB) better than 2 mV/m internal antennaMedium wave (MW) (S/N=26dB) better than 1 mV/m external antennaLong wave (LW) (S/N=26dB) better than 12 mV/m internal antennaLong wave (LW) (S/N=26dB) better than 4 mV/m external antennaShort wave (SW) (S/N=26dB) better than 30 uV● Selectivity:Frequency Modulation (FM) >60 dBMedium wave (MW) >60 dBLong wave (LW) >60 dBShort wave (SW) >60 dB● FM stereo separation: better than 25 dB● Output power:Speaker: 350 mWHeadphones: 10 mW / 8 - 32Ω stereo headphones● Storage memory: a total of 450Frequency modulation (FM) 100Medium long wave (MW) 100Short wave (SW) 250● Awakening mode: the radio station is screaming● Static current:Frequency Modulation (FM) <25mAMedium wave / long wave (MW / LW) < 23mAShort wave (SW) <27mAShutdown standby <90uA● Speaker specifications: diameter 40 mm / 16 Ω film speaker● Power supply mode:Battery powered: 3 R6 (No. 5) dry or rechargeable batteriesExternal power socket: USB specification / DC 5V 300mA● Weight: about 128g (without battery)● Physical size: width 53 × height 159 × thickness 26 (mm)● Random attachments:Stereo headphones, medium and long wave external antenna, instruction manual, certificate,● This machine adopts si4734 digital signal processing (DSP) chip to digitally convert analog FM/AM broadcast signals, and process and demodulate them by modern software radio principle, which improves listening sensitivity, selectivity, signal-to-noise ratio and Anti-interference ability● It can receive FM stereo, medium wave (expandable to long wave), short wave (2.3~21.95MHz) radio programs, practical functions, easy operation, power saving● FM receiving frequency range can be set to receive 76~108MHz (Japanese standard), 87~108MHz or 87.5~108 MHz (European and American standard)● With medium-wave external antenna jack and optional external wave external antenna, it can greatly improve the receiving sensitivity of medium wave/long wave band.● With a very practical multi-function digital adjustment knob, you can set the time, adjust the frequency, select the address● There are five channel selection methods: convenient tuning (ETM), manual search of radio frequency (VF), manual search for pre-stored radio (VM), automatic search and browsing of radio frequencies, automatic search and browsing of stored stations, of which ETM is Desheng The method of receiving the station to improve the efficiency of the platform● Manual, semi-automatic, fully automatic (ATS) can store up to 450 radio frequencies, of which 100 can be stored in the FM/medium long wave and 250 in the short wave.● Multi-function display: can display the working status of radio frequency, electric field strength, signal to noise ratio, temperature, battery capacity, etc.● High-sensitivity film speaker with beautiful tone and audible FM stereo broadcast with headphones● With broadcast timed function, you can start to listen to the preset radio program at regular intervals, and you can also set the automatic stop function within 1~90 minutes.● Highly intelligent power switch function: You can set the auto power off after 1~120 minutes of power on, or cancel the auto power off function.● It is powered by 3 R6 (No. 5) batteries. It can also be used with Ni-MH batteries and has a smart charging function (USB socket).● Medium wave external high sensitivity antenna and stereo headphones**Noun explanation: ETM——Easy Tuning ModeETM tuning method————Using the radio receiving circuit and MCU control software, pre-excluding the frequency points without radio programs, selecting the frequency of the suspected radio stations, so that the user can easily find out the radio station programs to be listened to in the future.It is well known that the frequency range of civil radio broadcasting and the frequency spacing of broadcasting stations are usually:Frequency Modulation: Frequency Range 87 — 108 MHz Frequency Interval 0.1 MHzMedium wave: frequency range 522 — 1620 kHz frequency interval 9 kHzShort wave: frequency range 1700 — 30000 kHz frequency interval 5 kHzIn theory, the number of frequencies at which each band is allowed to appear is:FM 87 - 108 MHz can accommodate radio frequency points (108-87) ÷ 0.1 = 210Medium wave 522 — 1620 kHz can accommodate radio frequency points (1620-522) ÷ 9 = 122Shortwave 1700 — 30000 kHz can accommodate radio frequency points (30000-1700) ÷ 5 = 5660[The frequency of short-wave reception of PL-360 is (21950 - 2300) ÷ 5 = 3930]The digital tuning radio is designed to meet the receiving range and frequency step spacing according to the above regulations. Use the digital tuning radio to search for stations. From the low to the end of the frequency, the frequency spectrum should search for 210 frequency points, the medium wave should search for 122 frequency points, and the short wave should search for thousands of frequency points.But in fact, based on many reasons such as preventing pre-frequency interference, not every frequency has a radio broadcast. For example, listening to FM radio at different locations, rarely receiving several radio broadcasts, and receiving 60-70 radio broadcasts. For example, due to the signal transmission of the medium wave, the distribution of the number of stations is characterized by fewer nights during the day and several more can be received - dozens of stations.Take the short wave reception of PL-360 as an example:The short-band has (21950-2300) ÷ 5 = 3930 frequency points, and the actual radio programs that can be heard are dozens of days and hundreds of evenings, and the frequency distribution of the stations in the early, middle and late days is almost different. Assuming that the radio can only receive 200 radio programs, in order to find these 200 stations, you have to search for nearly 4,000 frequency points, so it takes a long time to search.In response to the above problems, Desheng developed the ETM tuning method, which uses the receiving circuit of the radio and the MCU control software to pre-exclude the frequency of the radio program without the radio, and selects the frequency of the suspected radio station (such as programs in different places and languages). Includes interference signals from the local electromagnetic environment). That is to say, with the ETM tuning method, it is possible to select tens of hundreds of suspected frequency points from thousands of frequency points, and the user can easily obtain from these preferred suspected frequency points in the subsequent receiving operation. Find out which radio station you want to listen to.By using the ETM convenient tuning method to listen to the broadcast, the frequency at which the user wants to search can be reduced to:FM several — dozens of days and nights are basically the sameMedium wave several — dozens of days, less during the day, more at nightShort-wave tens—Several hundred frequency points Less daytime, less late nights, more evenings, and stations are distributed in different frequency ranges in different time periods.How to operate the ETM function:To use the ETM function, first press the ETM button to search the band for full frequency and select the frequency of the suspected station. After the optimization is completed, the tuning knob can be used to operate the tuning.Special note: The number and frequency distribution of suspected stations are different at different times, at different locations, and in different bands, especially for short bands.Listen to the radio in the same place using the ETM method:FM band: As long as you do ETM optimization during the day, you should not do the ETM preferred frequency every time. However, if you change the listening location, it is recommended to do another ETM.Medium wave band: You can do an ETM selection on the night when there are more radio stations. However, if you change the listening location, it is recommended to do another ETM.Short-wave band: The convenience of listening to short-wave broadcasts with the ETM method is high and practical. To listen to short-wave broadcasts in ETM mode at different times, it is recommended to perform ETM selection first.In order to avoid searching for excessive clutter interference signals, it is recommended that you go to the balcony or open to the ETM.With the ETM tuning method, you will feel that listening to the radio can be so easy and fast.
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Отзывы о Полнодиапазонный радиоприемник DSP Pcket портативный динамик полноканальный с
Всё идеально !Теперь у меня есть новые замечательные часы !))Только сегодня забрала их..очень эффектные и красиво смотрятся на руке ))вживую... Читать отзыв полностью...