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HF (High Frequency) ????? ???? ???? ??????? 3 MHz ???? 30 MHz ??????? ????????????? ??????? ????? ??? ???????? ?????, ??????, ?????????, ????????, ????? ?????, ???????? ???????, ????? ????? ???????????? ??????? ???? HF ?????? ??????? ??? ????????? ???�??? ????????????? ???????? ??????? ??? ????? ????????? ??? ??????? ??????? ???? ?????

HF ????????? ??? ?????????

1. ?????????? ???????:
2. HF ???????? Skywave propagation (??????? ????????) ??????? ??? ?????? ??????? ???? ?????
3. ?? ????????? ????? ???????:
4. ? ???? ??? ????? ???????? ??????????? ??????? ??????
5. ??????? ???????? ????? ?????:

• 80m (3.5 MHz)
• 40m (7 MHz)
• 20m (14 MHz)
• 15m (21 MHz)
• 10m (28 MHz)
• ??????? ????????? ?????? ?????????? ????????? ???????

HF ?????? ?????????

1. ??? ?????? HF ?????:
2. ??? ?????????? ? ???? ??????? (100W+) ?????????????
3. ???????? HF ?????:
4. QRP (Low Power) ?????, ???????????? ? ????? ????????? ???? ???????
5. ?????? HF ?????:
6. ???????? ?????? ??? ????? ???????? ????????

????????? ??????

• SSB (Single Side Band): ????? ???????????? ???? ??????? ?????????
• CW (Morse Code): ?? ????????? ????????
• Digital Modes: FT8, PSK31, RTTY ???????, ?? ?? ??????????? ???? ??????????? ?????

?????????? ??? ???? ????????

HF ??????? ??????? ?????? ???:

• ??? ? ????? ????:
• ????? ?????? ???? ????????????? (20m, 15m, 10m) ???? ??? ????
• ????? ?????? ????? ????????????? (80m, 40m) ???? ??? ????
• ??? ????????? ? ??????? ??????:
• ??? ????????? ???? ??? HF ?????????? ????? ????

??????????

HF ?? ???? ??? ?????? ?????????? ????????, ????:

• Dipole
• Vertical
• Yagi
• End-Fed Wire
• ??????? ??????????? ??????? ?????? ? ???????????? ??????

Bangladesh-? HF ?????? ???????

????????? HF ????? ????? ???????, DXing (???????? ???????), ??? ??????????? ????????? ????? ????????? ??????? ???? ????????, ????? ?? ????????? ???? HF ????? ???????? ??????? ????? ???? ????? ???? ???????????? ?????? ?????