Zulu 3 DIP Switch and Their Recommended Use
Using Your Zulu 3 Headset
11
DIP switch
OFF position
ON position
Recommendations
Stereo/Mono
Stereo
Mono—Factory
setting
Affects audio from the panel only and should be set to Mono
in most cases. Set to Stereo only if you are using a stereo
panel. If your audio panel produces a mono signal but the
switch is set to Stereo, you will hear audio communications in
only one ear.
Leave off
Leave set to OFF
Test mode; for factory use only.
Cell mic bias—two
switches that must
both be in the
same position
Cell mic bias off—
Factory setting
for helicopter and
panel-powered
headsets
Cell mic bias on—
Factory setting for
battery-powered
airplane headset
Lets you make phone calls with the headset when it is not
plugged into a cockpit audio panel. Available for battery-
powered headsets only. Note to helicopter pilots: The
ON setting for these switches is incompatible with some
helicopter audio panels. If you plan to use this feature and
keep the switches set to ON, test the headset in the cockpit
before takeoff.
Noise gating
Factory setting
When enabled, Noise Gating eliminates a low level threshold
of sound (example: noisy intercoms). Test before using to
avoid missed communications from softer radio signals.
FlightLink
Factory setting
Enables FlightLink
For FlightLink to work properly, it must be in the ON position.
This will also affect cell phone usage — when in the ON
position, the recipient of a cell phone call will hear all sounds
on the intercom. To avoid this, unplug your headset from the
panel during phone calls.
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