Description of the 6-piece gift package (continue to look down, there are detailed descriptions of each accessory):
①LCD screen wiper cloth ② headphones ③Fish boneWinder
④Headphone couple splitter ⑤charger ⑥USB charging cable
●Machine accessories: stereo high-quality earphones, line-in audio cable, exquisite protective cover（Note that the machine does not have a memory card, the memory card needs to be purchased separately）
Tecsun PL-398MP MP3 player + full-band digital demodulation stereo radio!
TECSUN PL-398MPIt is a full-band stereo portable radio with MP3 playback function (SD card socket). It can listen to FM stereo, short wave, medium wave, and long wave radio, and play MP3 music. It has line input and can be used as an active small speaker.
main feature:
●Dual-channel dual-speaker design, listening to stereo programs can get immersive stereo effects
●FM stereo, short wave (2300~21950KHz), medium wave, long wave full band reception; FM reception frequency range 64~108MHz, can listen to China, Europe, America and Japan FM radio frequency, and can also listen to some campus radio
●Use the si4734 digital signal processing (DSP) chip of SILICON LABS, USA, to digitally convert FM/AM broadcast signals, and use modern software radio technology for processing, which greatly improves sensitivity, selectivity, signal-to-noise ratio and anti-interference ability
●7 ways to choose from: convenient tuning (ETM), automatic search and browse radio frequency, automatic search and browse stored radio stations, manual search for radio frequency (VF), manual search for stored radio stations (VM), direct input of frequency numbers, direct Enter the number of the stored radio station address. Among them, Easy Tuning (ETM) is the closing method created by Tecsun to improve the closing efficiency.
●Smart Variable Speed ??Shuttle Tuning Knob
●LCD displays radio frequency, signal strength/signal-to-noise ratio, temperature, time, battery power and other information
●Smart/manual LCD and key backlight
●30-level electronic volume control
●Manual/automatic shutdown (1~120 minutes)
●Radio alarm/buzzer wake up
●MP3 playback (SD card socket)
●Line input jack, can be used as active small speaker
●Use 3 R6 (No. 5) batteries for power supply, alsoNi-MH rechargeable batteries can be used (it can be charged intelligently through the power adapter of the USB socket, the power adapter needs to be purchased separately)
●The accessories of the machine itself: stereo high-quality earphones, line input audio cable, exquisite protective cover
●Physical size: width 187× height 90× thickness 30 (mm)
398MP basic technical indicators
1. Frequency range/tuning step
●FM（FM）
64—108MHz; Smart step 0.01MHz/0.1MHz
Optional frequency coverage:
Standard: 87—108MHz（Suitable for China, Europe and America）
Germany: 87.5—108MHz
Russia: 64—108MHz（Also suitable for receiving most campus broadcasts in China）
Japan: 76—108MHz
●shortwave（SW）
2300—21950KHz; Smart step 1KHz/5KHz
●Mid-wave（MW)
522—1620KHz; Smart step 1KHz/9KHz（Suitable for Asia, Africa and Europe）
520—1710KHz; Smart step 1KHz/10KHz（Suitable for North America）
●Long wave（LW）
153—513KHz; Smart step 1KHz/9KHz
2. Noise limit sensitivity:
●FM（FM） （S/N=30dB） Better than 3uV
●shortwave（SW） （S/N=26dB） Better than 20uV
●Mid-wave（MW） （S/N=26dB） Better than 1mV/m
●Long wave（LW） （S/N=26dB） Better than 10mV/m
3. Selectivity:
●FM（FM）＞60dB（±150KHz)
●shortwave（SW）＞60dB（BW=3KHz, ±5KHz)
●Mid-wave（MW）＞60dB（BW=3KHz, ±9KHz)
●Long wave（LW）＞60dB（BW=3KHz, ±9KHz)
4. FM stereo separation: better than 35dB
5. Output power（Distortion 10%）: &Amp;ge;180mW×2
6. Number of storage memories: 550 in total
●FM（FM）100
●shortwave（SW）250 pcs
●Mid-wave（MW）100
●Long wave（LW）100
7. Wake-up mode: broadcast alarm, buzzer to wake up
8. Quiescent current:
●FM（FM）＜25mA
●shortwave（SW）＜30mA
●Medium Wave/Long Wave（MW/LW）＜30mA
●Shutdown <80uA
9. Horn specifications: diameter 57mm, 8Ω, 250mW paper tray horn ×2
10. Headphone specifications: Φ3.5mm/32Ω stereo headset
11. Power supply mode:
●battery（Optional parts）: 3 sections R6（Number five）Dry battery or rechargeable battery
●External power supply (optional): USB specification DC 5V ≥250mA
12. Physical size: about width 187× height 90× thickness 30（mm）
13. Weight: about 365g (without battery)
14. Supplied accessories: Stereo high-quality earphones, line input audio cable, exquisite protective cover, instruction manual, certificate, after-sales service guarantee
PL-398MP physical picture
This is an animation showing the SD card insertion process:
Brief introduction of ETM function of PL-398mp:
ETM: Easy Tuning Mode
ETM tuning 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 the radio station to listen to in the future program.
As we all know, the frequency range of civil radio broadcasting and the frequency interval of broadcasting stations are usually:
FM 87 — 108 MHz, frequency interval 0.1 MHz;
AM 522 — 1620 kHz, frequency interval 9 kHz;
Shortwave 1700 — 30000 kHz, frequency interval 5 kHz.
Theoretically, the number of frequencies allowed for radio stations in each band is:
FM 87 — 108 MHz, the radio frequency points that can be accommodated are（108-87）÷0.1 = 210;
Medium wave 522 — 1620 kHz, the radio frequency points that can be accommodated are（1620-522）÷9 = 122;
Shortwave 1700 — 30000 kHz, the radio frequency points that can be accommodated are（30000-1700）÷5 = 5660
【The frequency of PL-398mp''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s 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 low to high frequency, 210 frequency points are searched for FM, 122 frequency points are searched for medium wave, and thousands of frequency points are searched for short wave.
But in fact, for many reasons, such as preventing adjacent frequency interference, not every frequency has a radio broadcast. For example, when listening to FM broadcasts in different locations, at least a few radio stations are received, and as many as 60 — 70 radio broadcasts; another example is the distribution of the number of radio stations in medium wave due to signal transmission. , Can receive only a few—— dozens of radio stations.
Take the shortwave reception of PL-398mp as an example:
Short-wave band has（21950-2300）÷5 = 3930 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. Assuming that the radio can receive only 200 radio programs, then in order to search for these 200 radio stations, you have to search for 3930 frequency points, so the search will take a long time.
In response to the above-mentioned problems, Tecsun has developed an ETM tuning method, which uses the receiver circuit of the radio and MCU control software to pre-exclude the frequency points that do not have radio programs, and select the frequency points of suspected radio stations.（Such as programs in different countries and languages, as well as interference signals from the local electromagnetic environment）. In other words, with the ETM tuning method, dozens of frequency points can be selected from thousands of frequency points ———hundreds of suspected frequency points. It is easy for the user to close the station in the future. Find out the radio station program you want to listen to from these selected suspect frequency points.
Use ETM convenient tuning method to listen to the radio, the frequency points that users want to search can be reduced to:
FM several——dozens, basically the same in day and night;
Medium wave several——dozens, less during the day and more at night;
There are dozens of shortwaves —— hundreds of them, with little daytime, little late at night, and more in the evening, and in different time periods, radio stations are distributed in different frequency ranges.
Operation method of ETM function:
To use the ETM function, you must first press and hold the ETM button to search for the full frequency of the band you are in, 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 in the short band.
Use the ETM method to listen to the radio in the same place:
FM band: Just do ETM optimization once during the day, and don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t do ETM optimization every time in the future. But if you change the listening location, I suggest you do ETM again.
Medium wave band: You can do an ETM optimization at night when there are more radio stations. But if you change the listening location, it is recommended to do ETM again.
Shortwave band: The ETM method is convenient and practical to listen to shortwave broadcasts. To listen to shortwave broadcasts in ETM mode at different times, it is recommended to select ETM first.
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.
With the ETM tuning method, you will feel that listening to the radio can be so easy and fast.
Q&A:
Q: What is the difference between ETM and ATS?
A: ETM and ATS are basically the same in the principle of search/storage frequency.
The signal strength threshold of the radio station during ATS search is set to be relatively high, in order to minimize the locking of non-radio frequency, too weak and worthless radio frequency. The searched frequency will be 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 perform ATS operations at will and overwrite the radio frequency that you have worked so hard to edit and organize.
ETM is a convenient tuning method based on frequency tuning. It has a lower threshold for search and lock. It aims to exclude frequencies that are definitely not radio or even noise. This mode can lock on weaker suspected radio signals and finish ETM Listening to the radio after optimizing the frequency can not only save your operating time, but also increase the life of the tuning knob. Just because the convenient ETM tuning method does not provide editing functions, you can perform ETM operations anytime, anywhere without hesitation. Search for suspected radio frequency.
One tip: In a better listening environment, the number of radio frequencies searched by ETM and ATS may be the same, especially on the FM band. Anyway, you won’t lose anything with ETM. PL-398mp has both ATS and ETM functions. You can repeat the operation to compare the differences.