jotron Tron TR30 AIR, User Manual

Page: 29 / 44

Doc. No.: 101770 Rev. B
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Page 29 of 44
When the receiver signal is too distorted (by radio noise)
to be readable, the loudspeaker or speaker mic is
automatically muted. This is indicated by the Noise
Cancel (NC) symbol that appears in the display.
8.7 Key lock and unlock
1. Press and hold the key lock/unlock button for 2 seconds to lock or
unlock the buttons on the front.
A key symbol appears when the radio is locked. PTT,
instant access 121.5MHz, volume and squelch are still
available when the radio is locked.
8.8 Menus
1. Press the up and down arrow buttons at the same time to enter
or exit the menu system.