High Density Mode; Frequency Diversity - Shure ULX-D Quad Manual

When interference is identified, the RF LEDs illuminate red and the following warning displays on the receiver LCD panel.
If the warning display persists or the audio drops out repeatedly, perform a Scan and Sync at the first opportunity to find a clear
frequency.

High Density Mode

High Density mode creates additional bandwidth for more channels in crowded RF environments. Frequency efficiency is opti­
mized by running at 1 mW RF transmit power and narrowing the modulation bandwidth, allowing for the channel spacing to be
reduced from 350 kHz to 125 kHz. Transmitters can be positioned on adjacent channels with unsubstantial intermodulation dis­
tortion (IMD).
High Density mode is ideal for applications where many channels are needed in a confined area, transmission distances are
short, and the number of available frequencies is limited. Up to 30 meters of range is available in High Density mode.
Setting the Receiver to High Density Mode
To set the receiver to High Density mode:
DEVICE UTILITIES > ADVANCED RF > HIGH DENSITY
Use the control wheel to set HIGH DENSITY to ON.
When prompted, sync the transmitter and receiver to enable HIGH DENSITY mode.
Note: When the receiver is in HIGH DENSITY mode, the following indicators are shown on the receiver display:
• The HD icon will appear on the receiver display
• The receiver band name will be shown with an "HD" added. (example: The G50 band will appear as G50HD)
• The transmitter group and channel are assigned letters instead of numbers (example: G:AA CH:AA)
Best Practices for High Density Mode
• When band planning, position ULX-D High Density channels in a range of frequencies separated from other devices.
• Use a separate RF zone for ULX-D High Density channels to prevent intermodulation distortion from other devices.
• During High Density channel scanning, turn on all other transmitters and move them to their intended position.
• Perform a walk test to verify transmitter range
• If using custom groups, the groups loaded into the receiver must be compatible with High Density mode

Frequency Diversity

Frequency Diversity is an advanced ULX­D receiver feature that safeguards against loss of audio signal caused by RF interfer­
ence or by power loss in a transmitter.
In Frequency Diversity mode, the signals from two transmitters from a common audio source are routed to the outputs of 2 re­
ceiver channels. In the event of interference or power loss, the audio from the good channel is switched to both outputs to pre­
serve the audio signal. Switching between channels is seamless and inaudible.
When the receiver senses that the signal quality has improved, audio routing is restored without interrupting the audio signal.
Note: WWB6 software offers an option to selectively lock the diversity audio source to a specific transmitter (see Wireless Workbench 6 section).
Best Practices for Frequency Diversity
• Use the same microphone type and model for each transmitter
• Place microphones within close proximity to the source
• Use the gain controls to match the output levels for each receiver channel
• If Audio Summing is active, use a Y-cable (Shure AXT652) to connect the bodypacks to a single audio source to prevent
comb filtering
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