Hi, I get two of this radios and a got a question, in the manufacturer description said " Frequency range. IC-F50 IC-F60, 136-174 MHz 400-470 MHz 450-512 MHz (U.S.A.) 450-520 MHz (General)" but if when try a frequency in the UHF band 462 MHz the channel name stay binking and can't transmit. What I'm doing wrong?