+ * Given the bit period of the baseband, T, the bandwidth of the
+ * baseband signal is B = 1/(2T). The overall bandwidth of the
+ * modulated signal is then Channel bandwidth = 2Δf + 2B.
+ *
+ * 38400 -- 2 * 20500 + 38400 = 79.4 kHz
+ * 9600 -- 2 * 5.125 + 9600 = 19.9 kHz
+ * 2400 -- 2 * 1.5 + 2400 = 5.4 khz
+ *