User’s Guide – 900MHz Stereo Audio Transmitter & Receiver
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the channel to “00” is the same as channel “01.” Similarly, setting
the channel to any number from “33” to “99” is the same as
channel “32.”
If several AT900-32 transmitters are to be used
simultaneously in a common area (so as to broadcast
multiple audio programs), each transmitter must be set to
its own unique channel.
Selecting the Channel of Operation (Receiver)
The AR900-32 provides 32 user-selectable channels. Referring to
Figure 4 and Table 1, use the
DOWN
and
UP
buttons on the unit’s
front panel to select the desired channel. Momentarily pressing
either button will raise or lower the displayed channel by one;
holding either button continuously will rapidly cycle the channels
up or down as appropriate. If multiple AT900-32 transmitters are
operating in a common area to broadcast multiple audio programs,
the AR900-32 receiver can receive any of the desired programs
simply by selecting the corresponding channel.
Figure 3 – AT900-32 Transmitter (Front Panel)
Set this selector
to the “tens” digit
of the desired
channel
Set this selector
to the “ones” digit
of the desired
channel
Figure 4 – AR900-32 Receiver (Front Panel)
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Applied Wireless, Inc.
If you encounter sporadic noises, dropouts, fading, etc., it may be
due to interference from another 900MHz device (such as an older
cordless phone or baby monitor) operating nearby. To alleviate the
problem, try selecting a different channel for the transmitter and
receiver – ideally one that is at least 9MHz above or below the
originally selected channel (see Table 1).
Please note: Wireless devices that operate outside of the 902 –
928MHz frequency band, such as modern cordless phones and
computer networks operating at 2.4 or 5.8GHz, will not generally
interfere with, or be affected by, the AT900-32 transmitter and/or
the AR900-32 receiver.
Table 1 – Channel / Frequency Allocations
Channe
l
Number
Frequenc
y (MHz)
Channe
l
Number
Frequenc
y (MHz)
Channe
l
Number
Frequenc
y (MHz)
Channe
l
Number
Frequenc
y (MHz)
01
905.0 09 914.2 17
905.6 25 915.0
02
906.2 10 915.4 18
906.6 26 916.2
03
923.6 11 917.0 19
907.6 27 917.4
04
924.4 12 917.8 20
908.8 28 918.4
05
925.6 13 919.0 21
910.0 29 919.6
06
910.6 14 920.6 22
911.2 30 921.0
07
911.8 15 921.4 23
912.4 31 921.8
08
913.4 16 922.6 24
913.8 32 923.0
NOTE 1:
Setting the transmitter to channel “00” is the same as channel 1. Similarly, setting
the transmitter’s channel to any number from “33” to “99” (inclusive) is the same as channel
32.
NOTE 2:
If the AT900-32 and AR900-32 will be used along with an Applied Wireless video
transmitter and receiver (models VT900-3 and VR900-3), the channel for the audio units
must be at least 9MHz above or below the channel of the video units, to prevent
interference between the RF signals. For example, if the video units are set to channel 1
(907MHz), set the audio units to channel 32.
