Airsmart Technology R801W-3DI, Руководство пользователя

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①
What is shortwave radio?
Many countries in the world use short frequency to perform worldwide broadcast transmission. Shortwave frequency
range is usually between 1.6MHz and 30MHz. The radio that can receive the frequency with the range is called
shortwave radio.
②
What is “shortwave meter wave band”
？
In general, we also divide the shortwave frequency into many "meter bands". Each meter band contains a frequency
range. For example, the 19M band contains a frequency range from 15.100 to 15.600MHz. The International Radio
Consultation Committee (CCIR) stipulates that the civil broadcaster uses the frequency within meter band range, and
the frequency beyond meter band is mostly used for military and other civilian communications. Therefore, the civil
broadcasting programs can only be received within the range of meter band frequency. (Please refer to the table
below)
Note: 1MHz (MHz ) = 1000kHz (kHz)
Band (M) MHz(MHz ) KHz (GHz) Radio distribution and listening effect
11 25.67-26.10 25670-26100 International wave band Very few broadcasting stations
13 21.45-21.85 21450--21850 International wave band Very few broadcasting stations, only specific station available
15 18.90-19.02 18900-19020 International wave band Many broadcasting stations, good effect from noon to 9:00 pm;
common effect in the morning, and very few stations from late at night
to early morning
16 17.55-17.90 17550-17900 International wave band
19 15.10-15.60 15100-15600 International wave band
22 13.60-13.80 13600-13800 International wave band Good effect at dusk, but not many radio stations
25 11.65-12.05 11650-12050 International wave band Maximum broadcasting stations, good effect all day long, and best
effect in the morning, at dust and to 12 o'clock. 31 9.50-9.90 9500--9900 International wave band
41 7.10-7.35 7100-7350 International wave band
Many broadcasting stations in the morning, evening and late at night,
but susceptible to interference, and loud noise
49 5.95-6.20 5950-6200 International wave band
60 4.75-5.06 4750-5060 Regional wave band
75 3.90-4.00 3900-4000 International wave band
90 3.20-3.40 3200-3400 Regional wave band Good effect at night, but no many broadcasting stations, bad effect and
loud noise during daytime 120 2.30-2.495 2300--2495 Regional wave band