User's Manual
9
2.4 GHz Spectrum Overview
GLX-D operates within the 2.4GHz ISM band which is utilized by for Wi-Fi, Bluetooth, and other wireless. The benefit of 2.4GHz is that it’s one 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 if these bursts are very high-level,
they 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 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)
• 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
• Recharge or replace the transmitter battery
• Keep transmitters more than 2 meters (6 feet) apart
Note: GLX-D transmitters closer than 6 inches (15 cm) to other non-GLX-D
transmitters may cause audible noise in that transmitter
• During sound check, mark trouble spots and ask presenters or
performers to avoid those areas
2.4 GHz Frequency Tables
The following table lists receiver frequencies, channels, and latency for each group:
Group 1: Channels 1-4 (latency = 3.9 ms)
1/1 1/2 1/3 1/4
2424 2418 2411 2405
2425 2419 2413 2406
2442 2448 2430 2436
2443 2450 2431 2437
2462 2469 2476 2455
2464 2471 2477 2457
Group 2: Channels 1-5 (latency = 7.3 ms)
2/1 2/2 2/3 2/4 2/5
2423 2404 2417 2417 2437
2424 2405 2418 2418 2438
2443 2426 2451 2451 2462
2444 2427 2452 2452 2463
2473 2456 2468 2468 2477
2474 2457 2469 2469 2478
Group 3: Channels 1-6 (latency = 7.3 ms)
3/1 3/2 3/3 3/4 3/5 3/6
2415 2422 2426 2447 2409 2431
2416 2423 2427 2448 2451 2462
2443 2439 2457 2468 2452 2463
DRAFT
3.4.13