> Because each channel had an effective base bandwidth of 10 MHz and a TV program used 4 MHz, it was possible to house a TV program and a small number of tele

> Because each channel had an effective base bandwidth of 10 MHz and a TV program used 4 MHz, it was possible to house a TV program and a small number of telephone lines on the same channel simultaneously Only a few telephone lines on 6MHz!!! How large guard bands do you need on a 3Khz telephone line? Edit: layout