E F Johnson Company 2425M80 Benutzerhandbuch
Draft 02 - Sep 1 2015
3-5
General Operation
3.1.4
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.
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
Levels can be adjusted by programming.
Levels can be adjusted by programming.
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.
released as soon as the message is complete.
3.1.5
Display Backlight Control
If the Backlight function is programmed, it can be used to select Bright, Dim, 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 4.10).
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 4.10).
3.1.6
Display Viewing Angle & Contrast Adjust (Standard Control
Head Only)
Head Only)
If the display on the standard head 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.
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.
probably improperly adjusted.