The data is scrambled to a V.35 format. The purpose of the scramble is not for security, but rather to create a data stream that never stays in a one or zero state longer than five bit times.

Synchronous data receivers, because of constantly changing data polarity, can create a clock signal that samples the center of each data bit to determine the bit value. Thus the leading edges of the data stream need not be free from noise, as is the case with asynchronous data.

Once the receiver reforms the data stream from the clock sample process, it is descrambled. The original data stream is thus recreated.

The WX-96ENC prepares the scrambled data for FM transmission. This is typically accomplished by Direct Frequency Shift Keying (DFSK) the RF carrier signal. The final section of the encoder processes the data stream by removing modulation components that could cause the trasmitted carrier to splatter out of it's assigned bandwidth.

The ouput of the encoder is adjustable to permit a proper deviation fof the transmitter. The Zephyrus technique deviates the carrier plus and minus .35 times the baud rate. This results in an occupied bandwidth equal to the baud rate.

It is vital that this deviation level not be exceeded if a 9600 baud signal is to occupy the bandwidth normally allocated for standard voice communications channels.

This is easily verified with a Zephyrus WX-3 receiver with deviation monitor option.