Full band radio
Full-band radio can listen to medium wave, short wave, FM, etc. Because this kind of radio has all the bands and there is no interval in the middle, it can listen to the radio of any radio broadcast band.
Secondary frequency conversion
The so-called second frequency conversion is to first convert the radio signal to the first IF, and then convert the first IF to the usual 455kHz or second IF through the second frequency conversion to improve the sensitivity, selectivity and anti-interference ability of the radio receiver.
Medium Wave (AM)
You can listen to other domestic provinces, cities, or overseas broadcasts. Because the frequency of this band is relatively low, the clarity is not so good, and it is easy to be out of sound.
The frequency is higher than the medium wave, and the clarity is relatively better. The main broadcasts are other radio broadcasts in other domestic provinces and cities and foreign broadcasts.
Frequency modulation (FM)
The frequency is between FM76 to FM108, which is stereo broadcast with the best definition. The stations you listen to are mainly FM stations within the province.Because its frequency is higher, the definition is better, but the transmission will be vulnerable to obstacles. Influence, so it is more sensitive to the direction of the antenna.
Digital tuning is the use of digital circuit technology and electrical tuning technology to tune the tuning loop of the radio and the selection channel. Electrical tuning is performed using the capacitance of a varactor diode, which varies with its bias voltage. Digitally tuned radios are all electrically tuned.
The TV program sound that the TV sound radio can receive is the signal transmitted locally wirelessly; if the radio is placed next to the closed line of the cable TV, it can also receive some sound signals in the frequency range.
The ability of a radio to select the signal of a desired station from many different frequency stations is called selectivity. The better the selectivity of the radio, the less susceptible it is to interference from other stations.
The ability of a radio to receive weak signals is called sensitivity. If a receiver can receive a very weak signal, the sensitivity of the receiver is high, otherwise the sensitivity is low.