Clear-Com HLI-FBS - Manual (Page 92)

3. On the Encore (MS-704) Main Station, adjust nulling for the selected channel (either channel A,
B, C or D on the MS-704). Nulling helps to reduce echo while talking on a two-wire audio system.
Tip: The amount of null that is required changes when you add or remove devices, or alter the
length of the cabling. For optimum performance, Clear-Com recommends that you adjust the
nulling every time you make a change to the system configuration.
Note:
Ensure that all Talk keys/routes are disabled before auto-nulling commences.
To adjust nulling on a channel on the Encore Main Station (MS-704):
a. Turn the screwdriver-adjustable Sidetone Adjust control (just below the headset
connector) [ ] to the appropriate level.
b. Turn the screwdriver-adjustable Listen level control (the null control, located just below
the channel Talk button and Call LED) [ ] for the channel to the appropriate level.
Tip: If the headset microphone is being used, hum or gently scratch the mic for a
continuous signal source to null on. If a good null is not attainable, switch the Long /
Short DIP switch for the channel to its opposite setting. Use the setting that produces
the best audio quality.
To optimize audio quality, you may also want to adjust the Audio Settings on the
HMS-4X Main Station. For more information, see 5.2 Configuring the Audio settings.
9.1.4 Connecting to Encore remote stations
Connecting to an Encore remote station (for example, the RM-704) is similar to connecting to an Encore
Main Station (see 9.1.2 Quick reference: Connecting to Encore ).
However, you will require a separate power supply (for example, the PS-702 (two channel) or
PS-704 (four channel) power supply) to power the remote station (which is unpowered) and any
connected wired beltpacks.
9.2 Connecting HelixNet Partyline to RTS (Telex) two-wire
systems
9.2.1 About RTS two-wire systems
HelixNet Partyline is also designed for interoperability with RTS (Telex) TW (two-wire) analog partyline
systems from Telex.
RTS two-wire systems include fully programmable intercom (main) stations, remote speaker stations, two-
wire beltpacks, and two-wire power supplies.
90 HelixNet Partyline User Guide