User Manual
Challenging Wireless Environments
Some environments are more difficult than others for 2.4 GHz wireless system
performance. Additionally, body absorption has a greater impact in the 2.4
GHz spectrum, compared to the UHF spectrum. 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:
• Areas with few reflective surfaces such as:
⁃ Outdoors
⁃ Buildings with very high ceilings
• 3 or more GLX-D receivers in use
• Strong Wi-Fi presence
• Competitive 2.4 GHz systems in use
Note: Unlike analog TV band wireless which typically uses the same type of
transmissions across manufacturers, all 2.4GHz wireless currently on the
market use different variations of wireless transmission. These differences
make it more difficult to mix and match 2.4 GHz from multiple manufacturers
successfully, as can be done with TV band wireless solutions.
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).
• Reduce transmitter to receiver distance - for example, place receivers
on stage with a line of sight to the front of the receiver.
• Change the group for all GLX-D systems:
⁃ Single-Chanel System: use Group 4, which is optimized for single-
channel use
⁃ Multi-Channel System: use Group 2, which is the most robust wireless
group
• Move receiver further away from Wi-Fi access points, computers, or
other active 2.4 GHz sources. Recommended distance is a minimum of
3 meters (10 feet).
• Disable non-critical Wi-Fi on computers, cell phones, and other portable
devices
⁃ If you plan to use Wi-Fi during a performance, turn on Wi-Fi prior to
turning on GLX-D and scanning for the best channel.
• Keep the transmitter and receiver more than 2 meters (6 feet) apart
• Avoid heavy Wi-Fi traffic activities such as downloading large files or
viewing a movie.
• Locate competitive 2.4 GHz receivers away from each other
• Avoid placing transmitter and receiver where metal or other dense mate-
rials may be present
• Move the receiver to the top of the equipment rack
• 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
• If there is a known strong source of Wi-Fi and you specifically want to
use frequencies within that Wi-Fi channel, use the following
Group/Channel of GLX-D (best option listed first):
⁃ Wi-Fi 1: Group 3/Channel 8, Group 3/Channel 4
⁃ Wi-Fi 6: Group 3/Channel 7, Group 3/Channel 5
⁃ Wi-Fi 11: Group 3/Channel 2, Group 3/Channel 1
2.4 GHz Frequency Tables
The following tables list receiver channels, frequencies, and latency for each
group:
FrequenciesGroup/Channel
2424 2425 2442 2443 2462 24641/1
2418 2419 2448 2450 2469 24711/2
2411 2413 2430 2431 2476 24771/3
2405 2406 2436 2437 2455 24571/4
FrequenciesGroup/Channel
2423 2424 2443 2444 2473 24742/1
2404 2405 2426 2427 2456 24572/2
2410 2411 2431 2432 2448 24492/3
2417 2418 2451 2452 2468 24692/4
2437 2438 2462 2463 2477 24782/5
FrequenciesGroup/Channel
2415 2416 24433/1
2422 2423 24393/2
2426 2427 24573/3
2447 2448 24683/4
2409 2451 24523/5
2431 2462 24633/6
2404 2473 24743/7
2435 2477 24783/8
FrequenciesGroup/Channel
2404 2405 2410 2411 2417 2418 2423 2424
2426 2427 2431 2432 2437 2438 2443 2444
2448 2449 2451 2452 2456 2457 2462 2463
2468 2469 2473 2474 2477 2478
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Shure IncorporatedGLXD4 Wireless Receivers
2017/10/2310/19