Its function is to receive and retransmit a radio signal, in this case we will talk about a radio system with HT (Handy Transceiver) or portable radio equipment, and a base radio (the repeater).

These systems operate in 2 bands, Very High Frequency (VHF - Very High Frequency) and Ultra High Frequency (UHF - Ultra High Frequency).

A VHF or UHF repeater receives and amplifies (or "repeats") a given frequency so that it can transmit with more power and thus cover farther distances or spaces with high density, without loss or degradation of the signal. The differences between these two types of receivers are mainly in the frequency ranges that they can receive and ultimately amplify.

At this point, what band should we use? VHF, UHF or both.
The logical answer is, it depends on where you are planning to use HT or portable radios.

In the VHF band there is the possibility of secondary interference and increased RF (radio frequency) noise, although in clear places the signal goes further.
In the UHF band we will have less RF noise interference, ideal to cover places with many obstacles and short distances.

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