INSTALLATION AND USERS GUIDE
3019 Alvin DeVane Blvd.
Ste. 560
Austin, TX 78741
Phone: (650) 965-8020
CORPORATION
®
TECH SUPPORT: 650-965-8020 ext. 703
The Setcom MS-900SPW4 is a Wireless Radio Interface for use
with up to 7 LibMAX Series Wireless Headsets:
Radio Transmit Headsets:
CSB-900MAX (standard)
CSB-902MAX (vented)
Intercom-Only Headsets:
CSB-901MAX (standard)
CSB-905MAX (vented)
The MS-900MAX is typically connected to a single mobile radio
through use of the proper radio cable.
Adding an RRC-950 Radio Routing Controller and a
25-0108 connecting cable will allow operation with two radios. One
radio cable will be required for each radio. The RRC-950 has a
toggle switch that allows for switching TX, RX, and PTT functions
between the two radios (RX can be either summed or switched).
The MS-900MAX can be powered from 12 to 24 VDC, supplied by
a vehicle power system. The unit has an internal 1 Amp ATO-type
fuse, but it is recommended that the vehicle power source also be
fused (at least 1 A).
The system starts up as soon as power is applied.
No “pairing” is required to use headsets with the base unit, the
headsets only need to be on the same channel as the base unit
(displayed in the CHANNEL indicator).
Changing channels is accomplished by pressing the CHANNEL
SELECT button.
Typically no adjustments are required, but if transmit or receive
audio levels to and from the radio need adjustment, see page 3.
Questions or technical issues? Please call:
Page 1 of 5
5/30/16 SBH
MS-900MAX_UserGuide_REV_X2.pdf
To install antenna, carefully
thread it onto the gold connector
on top of the MS-900SPW4
28-2031
Wireless Antenna
NC
S12S1
212C
P3
BT
N
AN
T
RADIO
POWER
RRC
CHANNEL
SELECT
CHANNEL
Instructions for operating the LiberatorMAX Series headsets
can be found in the LiberatorMax Fire Users Guide
