Data communication
15 sec
One thing about losing 3 dB
One thing about decibels
Quick check · tap an answer to continue
Lesson notes
Key points
- Every 3 dB of attenuation halves your signal power, so a 30 dB loss leaves just one thousandth of what you sent.
Takeaway: Lose 3 dB, lose half your power.
Quick check: A 3 dB loss does what to signal power?
- Doubles it
- Halves it
- Cuts it by 3%
10 log₁₀(0.5) ≈ −3 dB, so 3 dB loss means half the power.
3 dB = half
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