???????? ?????? ?????? ???? ???? ???? ?????? ???? ?????????. ????? ??????? ?????? ????, ??? ??? ?????????, ?????????? ???? ??? ?????????? ?????? ???? ?? ????????????.
?????? ?????? ?????? ??????? ??????????? ?????? ???? ???? ?????? ????? ?????? ????? ???? ????? ????? ???? ??? frequency ????? ??????? ????????? ??????? ?????? ???????????? ??????????????.
???? ???????????? ?????? ?????? ??????????? ???????????? ??????????? ???? ??????? ??????? ????????? ???????? ????????? ????? ????????? 10 kHz ????? 5 MHz ???????????? ??????? ??????? ???????????? ??????????????.
?????????? ????? ???????? ????? ????? ???? ???????????, ???? ??? .??????? ??????? ????? ???????? ??????? ???????????. ???????? ?????????????? ????? ???????? ??????? ??????????. ? ?????? ???? ???? ??????? ????? ??????? ???????, ???? ??? frequency ?????? ?????? ???? ????????? ????????????. ? ?????????? ????????? ???????? ???????? ?????? ???? ????? ???????? ???? ????-?????????? ?????? ????????????????.
?????? ???? ????? ???????? ???? ??????? ??????????? ????. ???????? ????????? ????? ??????? ?????????? ????????? ?????????? ?????????? ??????????? ??????? ???????? ????????.