Questenaتدريب يوضح لك ما ينبغي مراجعته لاحقًا
السؤال 474

What is the bandwidth of an FT8 signal?

  1. 10 Hz
  2. 50 Hzالإجابة الصحيحة
  3. 600 Hz
  4. 2.4 kHz

الشرح

FT8 uses eight-tone FSK at a symbol rate of 6.25 baud and 6.25 Hz between adjacent tones. Eight tones spaced that way occupy about 8 × 6.25 = 50 Hz, which is why many FT8 signals fit side by side inside a single SSB passband.

تابع هذا الاختبار

بدء التدريب
السؤال 474: What is the bandwidth of an FT8 signal? · FCC Amateur Extra Class (Element 4) · Questena