Shure GLXD4 Wireless Receiver User Manual download pdf (Page 12)

2.4 GHz Spectrum Overview

GLX-D operates within the 2.4GHz ISM band which is utilized by Wi-Fi, Bluetooth, and other wireless devices. The benefit of 2.4GHz is that it’s a global

band that can be used anywhere in the world, license free.

Overcoming the Challenges of 2.4GHz

The challenge of 2.4GHz is that Wi-Fi traffic can be

unpredictable. GLX-D meets these challenges in

the following ways:

• Prioritizes and transmits on the best 3

frequencies per channel (choosing from a

pool of 6 frequencies across the 2.4GHz

band)

• Repeats the most important information such

that one frequency can be taken out entirely

without audio interruption

• Continuously scans during usage to rank

all frequencies (both current and backup

frequencies)

• Seamlessly moves away from interference to

backup frequencies without audio interruption

Coexisting with Wi-Fi

GLX-D avoids continuous Wi-Fi traffic by

scanning the entire 2.4GHz environment and

selecting the 3 best frequencies to transmit

on. The result of this is reliable performance

for your GLX-D wireless system as well as

avoiding Wi-Fi transmissions which may be

important as well.

“Bursting” Wi-Fi is harder to detect as it is

periodic; however, because GLX-D repeats

the most important information, even bursts at

very high-levels don’t have an effect on your

audio performance.

Challenging Wireless

Environments

Some environments are more difficult

than others for 2.4 GHz wireless system

performance. The simplest solution in

many cases is to reduce the transmitter

to receiver distance such as placing the

receivers on the stage with a clear line

of sight.

Challenging environments include:

• Outdoors

• Very high ceilings

• 3 or more GLX-D receivers in use

• Strong Wi-Fi presence

• Non-Shure 2.4 GHz systems in use

Tips and Methods to Improve Wireless System Performance

If you encounter interference or dropouts, try the following suggestions:

• Scan for the best available channel (press the channel button)

• Reposition the receiver so there is nothing obstructing a line of sight

to the transmitter (including the audience)

• Change all GLX-D systems to Group 2, which is the most robust

wireless group

• Keep the transmitter and receiver more than 2 meters (6 feet) apart

• Keep transmitter to receiver distance within 60 meters (200 feet) -

place receivers on-stage within line of sight if possible

• Remove or relocate nearby sources of wireless interference, such as

Wi-Fi devices or hotspots, cell phones, two-way radios, computers,

media players, and digital signal processors

• Disable non-essential Wi-Fi/bluetooth devices and avoid heavy Wi-Fi

traffic activities such as downloading large files or viewing a movie.

• Locate GLX-D receivers away from non-Shure 2.4 GHz receivers

• Avoid placing transmitter and receiver where metal or other dense

materials may be present

• Move the receiver to the top of the equipment rack

• Recharge or replace the transmitter battery

• Keep transmitters more than 2 meters (6 feet) apart - this is less

critical at shorter receiver to transmitter distances

Note: If transmitters are within 6 inches of non-GLXD transmitters or

microphone cartridges, audible noise is possible.

• During sound check, mark trouble spots and ask presenters or

performers to avoid those areas

2.4 GHz Frequency Tables

The following tables list receiver channels, frequencies, and latency for each group:

Group 1: Channels 1-4 (latency = 4.0 ms)

Group/Channel Frequencies

1/1 2424 2425 2442

2443 2462 2464

1/2 2418 2419 2448

2450 2469 2471

1/3 2411 2413 2430

2431 2476 2477

1/4 2405 2406 2436

2437 2455 2457

Group 2: Channels 1-5 (latency = 7.3 ms)

Group/Channel Frequencies

2/1 2423 2424 2443

2444 2473 2474

2/2 2404 2405 2426

2427 2456 2457

2/3 2410 2411 2431

2432 2448 2449

2/4 2417 2418 2451

2452 2468 2469

2/5 2437 2438 2462

2463 2477 2478

Group 3: Channels 1-8 (latency = 7.3 ms)

Group/Channel Frequencies

3/1 2415 2416 2443

3/2 2422 2423 2439

3/3 2426 2427 2457

3/4 2447 2448 2468

3/5 2409 2451 2452

3/6 2431 2462 2463

3/7 2404 2473 2474

3/8 2435 2477 2478

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 95 96

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Shure GLXD4 Wireless Receiver User Manual Page 12

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