7
System Operation
(continued)
Squelch
The squelch function is used to minimize RF interference. If you experience RF
interference or cross talk between transmitters, increase the squelch level until
the interference is gone.
Please note that increasing the squelch level will decrease the operating range
of the system. For maximum operating range, make sure the squelch is turned
to the lowest position.
Frequencies
Each AT-ONE system comes with Group 1 and Group 2 frequencies available as
shown in the tables below.
The system has been designed in these groups to allow you to use up to four
channels in one group together, interference free (subject to national licensing
and regulations).
In an environment with two separated event areas (e.g., two separate
conference rooms) it is possible to use Group 1 in the first location and Group 2
in the second location.
All frequency usage is subject to national regulations, please check with your
local government authority for usage restrictions.
Troubleshooting
No Sound
• Check the power supply of the transmitter and receiver.
• Check that the transmitter and receiver are tuned to the same frequency.
• Check that the receiver is correctly connected to the mixer or amplifier.
• Check whether the transmitter is too far from the receiver or the Squelch
control is set too low.
• Check for obstructions between the transmitter and receiver.
Sound Interference
• Check the location for RF interference.
• When using two or more sets simultaneously, make sure the chosen
frequencies do not interefere with each other.
• Check whether the interference is coming from other wireless
microphones, TV, radio, etc. being used in the area.
• When using two or more sets keep the distance between the receiver
and the transmitter greater than 3 m and the distance between the two
transmitters greater than 1 m to avoid cross talk interference.
Distortion
• Check whether the receiver volume level is set too high or too low.
• Check whether the distortion is coming from other wireless microphones,
TV, radio, etc. being used in the area.
Rackmount Setup
To mount the receiver in a 19" standard rack using the included rack kit, attach
the L-shaped brackets to the opposite end of the unit and mount in the rack unit.
To connect two receivers in a 19" standard rack using the optional AT8677 rack
kit (sold separately), attach the short L-shaped brackets to the opposite end of
each unit, and connect the units together using two metal connecting plates.
Channel
MHz
11
482.625
12
486.825
13
488.225
14
491.550
Group 1
Channel
MHz
11
863.300
12
864.300
13
824.875
14
830.850
Group 1
Channel
MHz
21
495.775
22
506.300
23
507.700
24
511.375
Group 2
Channel
MHz
21
863.700
22
864.700
23
824.400
24
828.650
Group 2
DE3:
482 - 492 MHz,
495 - 512 MHz
HH2:
824 - 831 MHz
863 - 865 MHz
