She shifted communication frequencies again and set up a new security grid.

What if we don't hit the right communications frequency and it just ignores us?

No law against it, but they nevertheless remained silent on all communication frequencies.

Simultaneous to the camera system failure, all police communications frequencies in central Paris went down.

"Do you have the communications frequencies for the Warlock aircraft in the area?"

Some of the sectors cover extremely large geographic areas and on average use more communications frequencies per sector than any other facility.

As a mental exercise, she ran lists of security codes, communications frequencies, department numbers, and crew names through her head.

The comm-link can also scan police radios and other communication frequencies.

They tried hailing the ship on all kzinti communication frequencies.

I am recording and this message will automatically repeat on the two main communication frequencies, then the emergency frequency again.