Channel 9, channel can be selected from 0 – 9 where each channel has the same transmission characteristics, so opt for channel 0.
can select a channel by channel 9 from 0-9, where each channel has the same transmission characteristics, so opt for channel 0.
Can choose the channel channel since 9 0 - 9 which each channel has a transmission characteristic, too, so choose to use 0 channel.