Answer 2.11

Applying the Shannon–Hartley equation we obtain:

3500000 = 1400000.log2(S/N + 1)

Thus, for error free transmission, the S/N ratio must exceed:

S/N = 23.5 / 1.4 – 1 = 4.656 or 10log10(4.656) = 6.7 dB