User's Manual

Table Of Contents
Viking VM600 Mobile Radio Operating Manual 4-5
General Operation
4.1.3 Speaking into the Microphone
For best results, hold the microphone about 1-2 inches from your mouth and speak at a
normal conversational level. Do not shout since it distorts your voice and does not
increase range.
Note If excessive background noise consistently interferes with communications, Microphone
Sensitivity should be adjusted (using Armada).
Make sure that the PTT (push-to-talk) switch is pressed before you begin to speak and
released as soon as the message is complete.
4.1.4 Display Backlight Control
If the BKLHT option button is programmed, it can be used to select high, medium, or OFF
backlight modes. Otherwise, the keypad and display backlight is fixed in one of these
modes by programming. The backlight is totally disabled when the Surveillance mode is
programmed (see Section 5.10).
4.1.5 Display Viewing Angle and Contrast Adjust
If the display is difficult to read from the angle you normally view it, the viewing angle
can be adjusted as follows: Press and hold F2 and F6 to enter angle change mode. If you
do not rotate the select switch for three seconds, it times out and goes back to zone or
channel change.
Note If the display appears blank or all icons are continuously displayed, the viewing angle is
probably improperly adjusted.
Draft 4/29/2014