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TECSUN PL-380Full band digital demodulation stereo radio
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PL-380Features Introduction
●This machine uses the United StatesSILICON LABS si4734Digital signal processing(DSP)Chip, digitally convert analog FM/AM broadcast signals, and use modern software radio principles to process and demodulate, improve listening sensitivity, selectivity, signal-to-noise ratio and anti-interference ability
●Can receive FM stereo, medium wave, long wave, short wave (2.3— 21.95MHz)Radio programs, many practical functions, simple operation
●Wide FM receiving frequency range(64—108MHz),Including some campus broadcasts and 2—5-channel TV audio program
●Seven ways to select channels: convenient tuning(ETM),Manually search for radio frequency(VF),Manually search for a pre-stored radio station (VM), directly enter the frequency number or directly enter the pre-stored radio station address number, automatically search and browse the frequency of the radio station, and automatically search and browse the stored radio station. Among them, ETM is Tecsun’s original closing method to improve closing efficiency.
●Can be manual, semi-automatic, fully automatic(ATS)Store up to550Each radio frequency: FM/medium wave/long wave can be stored in each station100One, short wave can be stored250indivual
●Multi-function display: it can display radio frequency, signal strength/signal to noise ratio, temperature, battery power and other information
●30Level rotary electronic volume control
●Adopting optimized design of high-sensitivity film speakers, beautiful sound; with headphones, you can listen to FM stereo broadcasting
●With broadcast alarm/buzzer alarm function, you can start to listen to the pre-stored radio station regularly, and set it in1— 90Automatic shutdown within minutes
●With smart power switch function: you can set the1— 120Automatic shutdown after minutes, or cancel the automatic shutdown function
●This machine is very power-saving, use3FestivalR6(No. 5) Battery powered; Ni-MH battery can also be used for power supply(Another option), And use the machine’sUSBExternal power socket for smart charging
●Comes with a beautiful protective cover and stereo headphones
PL-380Basic technical indicators
●Frequency range/tuning step:
FM(FM): 64—108MHZ; Smart step 0.01/0.1MHz
Optional frequency coverage:
standard:87—108 MHz(Applicable to the standards of other countries except Japan, Germany, and Russia);
Germany:87.5—108MHz;
Japan:76—108MHz;
Russia: 64—108MHz(Including some campus radio and domestic 2—5 channel TV sound)
shortwave(SW): 2300—21950 kHz; smart step 1/5kHz
Mid-wave(MW): 522—1620 kHz; smart step 1/9kHz(Suitable for Asia, Africa and Europe)
520—1710 kHz; smart step 1/10kHz(Suitable for North America)
Long wave(LW): 153—513 kHz; smart step 1/9kHz
●Noise limit sensitivity:
FM(FM) (S/N=30dB)Better than 3 uV
Mid-wave(MW) (S/N=26dB)Better than 1 mV/m
Long wave(LW) (S/N=26dB)Better than 10 mV/m
shortwave(SW) (S/N=26dB)Better than 20 uV
●Optional:
FM(FM) >60 dB
Mid-wave(MW)>60dB
shortwave(SW)>60 dB
●FM stereo separation: better than35 dB
●Output Power:
Speaker: 250 mW
Headphones: 10 mW / 8-32 ohm stereo headphones
●Number of storage memories: Total550 pcs;
Tunefrequency(FM) 100
Mid-wave(MW) 100
Long wave(LW) 100
shortwave(SW) 250 pcs
●Wake-up mode: radio station alarm/buzzer alarm
●Quiescent Current:
FM(FM)<25mA
Medium Wave/Long Wave(MW/LW)<23mA
shortwave(SW)<27mA
Shutdown standby <90uA
●Speaker specifications: diameter 50mm/16ΩFilm horn
●Power supply mode: battery power supply:
3 sections R6(Number five)Dry battery or rechargeable battery
External power socket: USB specification/DC 5V 300mA
●Weight: about200g((Without batteries)
●Physical size: width 135×Height 86×Thick 26(Mm)
●Appearance patent number:200930066873.2
●Supplied accessories: stereo headset, protective cover, external FM/shortwave antenna, instruction manual, certificate, after-sales service guarantee
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PL-380 ETMFunction introduction:
ETM: Easy Tuning ModeConvenient tuning mode
ETMTuning method————Using the radio receiving circuit and MCU control software, the frequency points without radio programs are excluded in advance, and the frequency points of suspected radio stations are selected, so that the user can easily find out the radio station programs to listen to in the future.
As we all know, the frequency range of civil radio broadcasting and the frequency interval of broadcasting stations are usually:
FM87— 108 MHz 0.1MHz
Mid-wave522— 1620 kHz 9kHz
shortwave1700— 30000 kHz 5kHz
Theoretically, the number of frequencies allowed for radio stations in each band is:
FM87— 108 MHzThe radio frequency points that can be accommodated are(108-87)÷0.1 = 210indivual
Mid-wave522— 1620 kHzThe radio frequency points that can be accommodated are(1620-522)÷9 = 122indivual
shortwave1700— 30000 kHzCan you accept the silly boy stalls?(30000-1700)÷5 = 5660indivual
【PL-380The frequency of shortwave reception is(21950—2300)÷5 = 3930】
Digital tuning radios are designed to receive range and frequency step interval in accordance with the above regulations. Use digital tuning radio to search for radio stations, from the low end to the high end of the frequency, search for FM210Frequency points, medium wave to search122For shortwave, thousands of frequency points need to be searched.
But in fact, for many reasons, such as preventing adjacent frequency interference, not every frequency has a radio broadcast. For example, if you listen to FM radio in different places, you will receive a few radio stations at least, and you will receive more60— 70Radio broadcast. For example, due to signal transmission in medium wave, the distribution of the number of radio stations is characterized by less during the day and more at night, and only a few can be received.—Dozens of radio stations.
AgainPL-380Take the shortwave reception as an example:
Short-wave band has(21950-2300)÷5 = 3930There are several frequency points, and the actual radio programs that can be listened to are dozens in the daytime and hundreds in the evening, and the frequency distribution of radio stations in the morning, midnight and evening is almost different. Suppose the radio can receive only200A radio show, so in order to find this200Stations you have to search for near4000It takes a long time to search again.
In response to the above problems, Tecsun has developedETMTuning method, using the receiving circuit of the radio andMCUControl software, exclude frequencies without radio programs in advance, and select frequencies that are suspected of radio stations(Such as programs in different countries and languages, as well as interference signals from the local electromagnetic environment). In other words, useETMThe tuning method can select dozens from thousands of frequency points——There are hundreds of suspected frequency points, and the user can easily find out the radio station program you want to listen to from the selected suspected frequency points in the future closing operation.
Using ETM convenient tuning method to listen to the radio, the frequency points that users need to search can be reduced to:
FM several—Dozens, day and night are basically the same
A few in Poland—Dozens less during the day and more at night
Shortwave—Hundreds of frequency points: Fewer days during the day, less late at night, and more in the evening, and in different time periods, radio stations are distributed in different frequency ranges.
ETMOperation method of function:
first time usingETMFunction, first long press the ETM button to search the full frequency of the band where it is located, and select the frequency of the suspected radio station. After the optimization, you can use the tuning knob to operate the tuning.
Special reminder: The number and frequency distribution of suspected radio stations are different at different times, locations, and bands, especially short-wave bands.
Use in the same placeETMMethod to listen to the radio:
FM band: Just do the ETM optimization once during the day, and don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t do the ETM optimization frequency every time in the future. But if I change the listening location, it is recommended to do it againETM.
Medium wave band: Can do it once at night when there are more radio stationsETMPreferred. But if I change the listening location, it is recommended to do it againETM.
Shortwave band: useETMThe method is the most convenient and practical to listen to shortwave broadcasts. Use at different timesETMWay to listen to shortwave radio, it is recommended to do it firstETMPreferred.
In order to avoid searching for too many clutter interference signals, it is recommended that you go to the balcony or outdoor open area for ETM optimization.
usedETMTuning method, you will feel that listening to the radio can be so easy and so fast.
Q&A:
Q: ETMwithATSWhat''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s the difference?
A: ETMwithATSThe principle of search/storage frequency is basically the same.
ATSWhen searching, the signal strength threshold of the radio station is set to be relatively high, in order to minimize the locking of non-radio frequencies, and radio frequencies that are too weak and worthless to listen to. The searched frequency memory is automatically stored in the editable memory, and you can delete and increase the radio frequency at will afterwards. After sorting the stored radio frequencies, you can easily call out the radio frequencies you want to listen to from the memory. Because of this, I believe you will not be willing to do it at willATSOperate and overwrite the radio frequency that you have worked so hard to edit and organize.
ETMIt is a convenient tuning method based on frequency tuning, with a lower threshold for search and lock. It aims to exclude frequencies that are definitely not radio or even noisy. This mode can lock on weaker suspected radio signals.ETMListen to the radio after optimizing the frequency, which can not only save your operating time, but also increase the life of the tuning knob, precisely becauseETMConvenient tuning method does not provide editing function, you can do it anytime and without hesitationETMOperate to search again for the frequency of the suspected radio station.
One tip: in a better listening environment,ETMwithATSThe number of radio frequencies searched may be the same, especiallyFMBand. Anyway useETMNothing will be lost,PL-380ExistingATSAgainETMFunction, you can compare.
Field testPL-380Some photos of:
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