©2020 CAE 905K351052 v1.1 83
Appendix B - Wireless Voice Link
APPENDIX B - WIRELESS VOICE LINK
The WVL is a radio pair that operates in the 2.4 GHz unlicensed radio band. The handset
communicates wirelessly with the base station located inside the simulator. The base station
converts the digitized microphone stream from the handset and outputs it via the base station to the
headphone and line out jacks. The output projects through the head speakers inside the simulator.
To accommodate multiple WVL pairs in close proximity, each WVL is assigned two RF channels on
which to operate. The RF channels divide up the 2.400 – 2.4835 GHz spectrum in 80 single
frequencies to prevent the WVLs from interfering with each other.
Due to the nature of the unlicensed 2.4 GHz band, there may be other devices such as Wi-Fi,
microwave ovens or Bluetooth® radios operating in the 2.4 GHz band as well. Therefore, two
channels are used to transmit the audio stream redundantly to avoid interference. In case there is an
interference in one channel, the other can be used to extract the audio stream.
To operate correctly, both the handset and base station should be set to the same frequency using
the DIP switches located in the devices. If the interference is too high, the WVL firmware has the
ability to change channels automatically to avoid interruption. This process occurs simultaneously in
both the handset and the base station without the need for user intervention. The units revert to the
original frequency set on the DIP switches when both devices are restarted using the power switch.
Cautions and Warnings
This device complies with part 15 of the FCC Rules and with Industry Canada licence-exempt
RSS standard(s). Operation is subject to the following two conditions:
1. This device may not cause interference
2. This device must accept any interference, including interference that may cause undesired
operation of the device
Recommendations for Use
To receive the best sound quality from the WVL, please note the following recommendations:
• Do not separate the WVL pair with more than two walls
• Use channels 0 through 11 for the best sound quality
• Use channels 12 through 31 if more than 12 simulators are present in one area
Wireless Voice Link Devices
There are two unique devices that make up a WVL pair: the handset device and the base station
device. The base station device is located inside the simulator, while the handset device is battery
powered and carried by the user. The handset transmits voice input through a microphone to the
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