Interference caused by, for example, power lines, vehicles with little or no interference suppression, as well as buildings or natural obstacles in the daily operation of the vehicle can cause uncontrollable noise interference, despite complete suppression in your own vehicle.
atmospheric phenomena, such as fog, rain or snow can also interfere with radio reception.
With an increase solar radiation intensity reception quality on long, medium and short waves deteriorates. The best reception in this wave range is achieved at night, because at this time the working waves are most strongly reflected in the ionosphere.
Long-range reception is possible on the LW, SW and HF wavebands, since the waves propagate not only as terrestrial radio waves along the earth's surface, but also as spatial radio waves reflected from the ionosphere.
For physical reasons, the playback quality in medium wave range not as good as in the VHF range (VHF). However, the medium wave range, due to good long-range reception, especially at night, is used by a large number of transmitters, although interference due to their high concentration cannot be avoided.
Unlike the VHF band, the sound in the MB band is more muffled.
Range longwave radio transmitters exceeds the range of medium wave.
In the short wave range, the greatest range. You will find the largest number of transmitters and the best sound, with known physical limitations, on the 49 meter band.
VHF band (FM), compared to other ranges, the best sound. However, only a small number of stations can be received here, because the range of the transmitters due to rectilinear wave propagation is only 80 km. As you move away from it, noise interference arises and in the end the transmitter will not be heard at all or will be replaced by a more powerful one, in the range of which you will find yourself. If natural interference of this kind occurs, you should select another station.
On VHF, more frequent switching from one radio station to another is necessary.
Stereo reception available only on VHF. Interference that occurs as you move away from the transmitter may appear earlier than with mono radio reception. In this case, we recommend switching to mono reception or choosing another transmitter with a stereo broadcast.
Hissing, crackling, and sonic bursts occur if, as a result of buildings, a car radio receives the same transmitter signal two or more times within a fraction of a second. This explains the rapid change in volume.
Long hiss appears mostly after you have left the coverage area of the station or in the case of a pronounced shading zone. Noise elimination is only possible by tuning to a stronger transmitter.
Sound fading - especially in the MB range (AM) - occurs due to the superposition of terrestrial and spatial waves at the reception site and is often accompanied by reception distortion.
vibrating hiss occurs when direct communication from the transmitter to the receiver is obscured due to the presence of large buildings or natural obstacles.
When moving along the alley, a so-called. "fence sound effect".