Setcom IM-977 Installation And User Manual page 4

RX RANGE
SW4
(shown enlarged)
S1
S2
OFF ON
· 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
MUTING CONTROL
SW2
(shown enlarged)
S1
S2
OFF ON
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
IM-977 Adjustments
RX Audio, Muting Control
RX LEVEL
VR1
RX RANGE
SW4
OFF
MUTING
CONTROL
SW2
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.
Questions or technical issues? Please call:
TECH SUPPORT: 650-965-8020 ext. 703
3019 Alvin DeVane Blvd.
Ste. 560
Austin, TX 78741
CORPORATION
Phone: (650) 965-8020
Loosen top cover screws and carefully
remove cover to make adjustments
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