He kept his eyes glued on the screen and repeated the information over the secondary channel.

But broadcasters pointed out that in some markets the secondary channel is already used for Spanish and other foreign-language audio.

On the right walls were arranged small secondary channels, ensuring water evacuation.

When in 40 MHz mode, the center frequency is actually the mean of the primary and secondary channels.

"Looks like Ross wants earpiece communications for the ground operators, with a secondary channel to reach the ship."

The hydroelectric station is located in this secondary channel.

The secondary channel has accumulated over 220,000 subscribers and 17.3 million video views as of March 30, 2013.

On weekends, if sports games ran long, the news could be found on the secondary channel, though that practice ended in recent years.

Tuning in secondary multicast channels, however, required use of the remote control and was awkward.

In some markets, however, the secondary channel is used for Spanish and other foreign language audio, a potential conflict.