?? ??? ??????? ?? LPF ??? ???? ?????????? ??????? ?? ????? ?????????????? ?????????? ??? ???? ????, ?????? ???? ?????????????? ?????????? ?????? (attenuate) ?? ???? ??? ????? ?????, ????, ??? ???????? ???????? ???????? ??? ???? ??????? ???????????? ???????
?. ?? ??? ????????? ??? ???
- ?? ????????????? ??? ??? ? ???? 0 Hz ???? ???? ????????? Cut-off Frequency ????????
- ??? ????????????? ???? ??? ? Cut-off ?? ????? ??????????????? ???????? ???? ???? ?????? ???? ?????
Cut-off Frequency (Fc) ??? ??? ?????? ?????? ?????? ???????? ?????? -3 dB (?????? ???????) ???? ?????
?. ?? ??? ????????? ???
- ??????? ?? ??? ???????
- ??????: ???????? (R), ????????? (L), ?????????? (C)
- ??????? ??????? ????? ??? ???
- ??????: RF ?? ??? ??????? (???????????? ??????? ???????)?
- ????????? ?? ??? ???????
- ??????: ??-???????, ????????, ??????????
- ??????? ??????? ?????
- ??????: ???? ???????? ??? ????????
?. ??????? ?? ??? ????????? ???????
- ????????? ???????? � HF ???????????? ???? ????????? ????????? ????? ????????? ???????? ??? ?????
- ??????? ??????? � ???? ????????? ????????????? ??????
- ??????? ??????????? � ???? ????? ???????? ???????? ????????? ????????? ????? ????? LPF ?????????
?. ?????? � HF ???????????? LPF
????, ???? HF ???????????? 7 MHz ? ??? ????? ??? LPF ?? ????, ??? ???? 14 MHz, 21 MHz ??????? ?????????? ??????, ?? ???????? ???????? ????????????? ???? ?????
???? ???????? ?????? ??? 7 MHz LPF ?? ??????????????? ?????? ??? ?????
- ?. LPF ??????? ???????????? ?????Cut-off Frequency � ????????? ???? ???? ???????? ???? ????
- Filter Order � ?????? ?? ????, ????????? slope ?? ????? ????
- ??????? ?? � ??? ???????? ???? ?? ?? ??? ?? ??????? ???? ????
- ???????????? ??? (Tolerance) � RF ????????????? ???? ??? ??????? ?????????????
?. ???????? ??????? ????
- Butterworth Filter � ???? ??????? ???-???????, ???? ??????? ?????????????
- Chebyshev Filter � ????? ???-??, ?????? ???-???????? ??????? ???? ?????
- Elliptic Filter � ??????? ??????? ???-??, ?????? ???? ???????
? ????????: ?? ??? ??????? ??????????? ? ???????? ???????? ???????? ???????????? ???? ????????????? ???? ??? ?????????? ???????? ????? ????? ??? HF/VHF ?????????????????? ??? ????????????? ????? ??????????