HelixNet | User Guide
l Run auto-null. Auto-nulling helps to reduce echo while talking on a two-wire audio system.
You must run auto-null every time you change the cabling.
2. Physically connect the HMS-4X Main Station to the RTS intercom station (MCE325). The two
Channels of RTS TW intercom must be split prior to connection with either of the Two-wire
module ports. RTS Audio Pin 2 carries the power that is required for the Two-wire module.
Powering the connection:
You must power the connection between the systems using either a dedicated power
supply or an RTS power supply.
Connecting to the MCE325 device:
There are three 3-pin XLR connectors on the rear panel of the MCE325 device. In
two-wire mode:
l The left and right-hand connectors are used for intercom Channels 1 and 2 input/ output.
l The center connector is used for Channels 3 and 4 input / output.
l Connect to the selected Channel using standard microphone cabling.
Note: The MCE325 is designed for use with intercom lines with a 200-Ohm line
terminating impedance. A 200 Ohm termination plug is connected to the center 3-pin
XLR connector to prevent Channels 3 and 4 from oscillating when the MCE325 is in
two-Channel mode.
3. On the RTS device (in this case, the MCE325), adjust the nulling (if necessary) on the
Channel to which the HMS-4X Main Station is connected.
Nulling helps to reduce echo while talking on a two-wire audio system. A sidetone
nulling trimmer (control) is provided for each of the four Channels on the device.
To adjust a sidetone nulling trimmer:
a. Turn the speaker switch on (even if an external speaker is not connected). This
turns off the internal sidetone trimmer, which controls the sidetone level in
headsets.
b. Turn on the microphone. Activate the relevant Talk button and speak into the
microphone.
c. To minimize echo, adjust the sidetone nulling trimmer (located under the CH1
and CH2 rotary controls).
Note: The default setting for each trimmer is for maximum nulling of the
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