Which of the following is required when using FT8?
A special hardware modem
Computer time accurate to within approximately 1 second✓الإجابة الصحيحة
Receiver attenuator set to -12 dB
A vertically polarized antenna
الشرح
FT8 decodes by aligning to fixed 15-second windows, so the software has to know when a transmission began. A clock error much beyond a second pushes the signal outside the decoder's search window, which is why FT8 users synchronize their computers to internet time.