The automatic frequency checker sounds like a visual thing.

From the manual

Press [REV] (1s) to turn the ASC ON.

When the ASC is ON, the icon will appear on the display.

· While direct contact is possible, without the use of a repeater, the icon 
will

begin blinking.

· To exit ASC, press [REV].

Note:

Pressing [PTT] will cause the icon to stop blinking.

ASC does not function if you are using simplex operation.

ASC does not function while scanning.

Activating ASC while using Reverse will switch the Reverse function OFF.

If you recall a Memory channel or the Call channel, and those channels are 
set

up with the

Reverse function switched ON, the ASC will switch OFF.

A





display and blinks. Press any key other than the Tuning control while the

I wonder what "press "rev" means, I think they are talking about menu setup, 
but am not sure about the manual's translation, or my understanding.