NC
S1
2S
12
12
C
OFF
IM-977W4 Adjustments
RX Audio, Muting Control
RX LEVEL
VR1
RX RANGE
SW4
RX RANGE
SW4
(shown enlarged)
ON
OFF
N
O
1
2
·
To increase RX Level,
set S1 to ON
·
To decrease RX level,
set S2 to ON
·
Do not set both sections
to ON, use only one
section or the other
RX Audio level is normally set by the volume control on the mobile radio.
If further adjustment is needed, RX LEVEL control VR1 can be used to
adjust RX volume.
If more adjustment range is needed, the RX RANGE switch SW4 can be set
to allow higher or lower level settings.
3019 Alvin DeVane Blvd.
Ste. 560
Austin, TX 78741
Phone: (650) 965-8020
CORPORATION
TECH SUPPORT: 650-965-8020 ext. 703
Questions or technical issues? Please call:
MUTING
CONTROL
SW2
MUTING CONTROL
SW2
(shown enlarged)
ON
OFF
N
O
1
2
Normally, muting control is factory preset to
mute Aux Audio when either a PTT button is
pressed, or when RX audio from a radio is
detected.
·
To turn off RX muting set S1 to OFF
·
To turn off PTT muting set S2 to OFF
S1
S2
S1
S2
Page of
7
8
Loosen top cover screws and carefully
remove cover to make adjustments
S
