Radio interference factors

Medium wave: The propagation of medium waves is mainly affected by the ionosphere, and more medium wave radio stations will be received at night than during the day. This is due to the different changes in the ionospheric conductivity during the day and night. During the day, due to sunlight exposure, the ionospheric density increases, the conductivity is enhanced, and the absorption of radio waves is also large. A large part of the medium waves are absorbed and propagated not far; at night, the atmosphere is not exposed to the sun, and the ionospheric conductivity is greatly Weakened, the medium wave can be transmitted to a far place through the sky wave. Therefore, it is best to listen to the medium wave radio station at night

Shortwave: Medium-wave broadcasting is from the transmitting antenna of the radio station to the reception of the radio. The distance is within a few hundred kilometers in diameter, and the medium-wavelength is relatively long. It is not easily affected by obstacles such as buildings. However, the distance between the short-wave transmitting station and the receiver is often thousands of kilometers or even tens of thousands of kilometers. The transmitting antenna of the radio station also has a certain direction and elevation angle. During the propagation process, it is easily affected by the atmosphere and obstacles.

If you live in a reinforced structure or there are high-rise buildings around, a part of the broadcast signal is shielded, and the indoor signal will be much weaker than outdoor, so the best way to listen to shortwave is to use a radio lever outdoors Antenna listening, when indoors, use the radio near the window, or use the outdoor antenna to improve reception.

FM: The powerful VHF TV broadcast and radio waves from the BB transmitter station will interfere with FM reception. In addition, several FM stations with adjacent frequencies and powerful transmitting power will also interfere with each other. Therefore, when receiving strong interference signals, please shorten the whip antenna, change the direction of the antenna, change the listening position, and try to reduce the degree of interference.