Clear-Com HLI-FBS - Manual (Page 125)

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
microphone signal when a 200-ohm resistance terminates the channel.
However, you may have to adjust the nulling according to the system
configuration.
13.3 Connecting HelixNet Partyline to Tempest
®
13.3.1 About Tempest
Tempest is a digital wireless intercom system, comprising a basestation (Main Station) and
beltstations (beltpacks). There are two-wire and four-wire versions of Tempest available. The
system operates in either:
• The 2.4GHz ISM band (Tempest 2400 models).
• The 900 MHz ISM band (Tempest 900 models).
Tip:
For more information about Tempest, see your Tempest documentation or visit the wireless
intercom pages on the Clear-Com website: http://www.clearcom.com/product/wireless.
125 HelixNet Partyline User Guide