What You Probably Don’t Know about UHF Shortwave Radio
Various types of the radio have been invented throughout times. The aim of developing the radio relates to helping humans work. There is a radio type that has a certain frequency, called UHF. UHF has the frequency 430 MHz corresponds to a radio wave of 70 centimeters. UHF has less than other high-frequency waves as a radio. The frequency 144 MHz corresponds to a radio wave of two meters in length. The UHF radio spectrum is about one gigahertz. It makes this type of radio can have more impacts on humans.
The frequency paid by UHF radios has been extended from 400 to 470 MHz. The primary UHF radios appeared in the 512 MHz bands, then 800-960 MHz. UHF radios usually have a load capacity of several watts. UHF radios have long been a widely used long-range medium.
Benefits of UHF
One of the main advantages of UHF portable radios is their portability. Also, its signal can be transmitted by an external antenna. However, portable radios are not as suitable for handling interference in the same frequency group.
Mobile radios that can be mounted on a person’s dashboard have frequency scanning capabilities similar to those of a portable radio. UHF radios are not affected by solar activity. They operate only in all weather conditions.
This type of radios is very famous because they are sometimes mounted around a ring antenna that can be several inches in diameter and several meters in diameter. It is why UHF radios are very popular among amateur radios.
Restriction of UHF
The lower end of the UHF bands, unlike other frequencies, is less susceptible to digital sound; for example, the lower UHF bands are less vulnerable to interference from nearby power lines or microwaves. The same is especially true for television broadcasts in mountain regions. It makes it almost impossible for most companies to use UHF radios without a frequency license.
Many government agencies and courses have allocated UHF for some functions. Other districts have been delegated the entire range of UHF frequencies in the United States, except for a few rings reserved for amateur radio.
Another restriction of UHF frequencies is that they are often in the line of sight. If someone comes to a pond, his portable UHF radio may not work until he receives it from the canyon. However, UHF signals can go further if they bounce off the ionosphere.
Progression of UHF
UHF radios have difficulties with interference from local TV stations, which rely on UHF and RFID, which use UHF and other frequencies. For example, UHF radios use the 400-470 MHz frequency range, but 433 MHz is unique to RFID.
UHF portable radios are gradually being replaced by VHF radios in public safety with the development of technology. The FCC is taking advantage of this “narrow band” by rejecting new systems that do not meet the narrowband requirements.
Any portable radio, repeater, or base station that does not meet these narrowband requirements loses its operating license; the only alternative is redesign and replacement with attenuated hardware.