User’s Guide Instructions for Installation and Operation 900 MHz Stereo Audio Transmitter Model AT900-32 900 MHz Stereo Audio Receiver Model AR900-32 Long Range Wireless Applications
(This page intentionally left blank)
900 MHz Stereo Audio Transmitter Model AT900-32 900 MHz Stereo Audio Receiver Model AR900-32 Introduction / Product Descriptions Model AT900-32 from Applied Wireless, Inc. is a high quality transmitter designed to broadcast excellent quality low noise stereo audio from any line level source, to the Applied Wireless model AR900-32 receiver.
attaches with a BNC connector, enabling the use of an alternative antenna, (such as a directional flat panel or Yagi) to increase operating range (please contact Applied Wireless for a selection of available antennas). The AT900-32 transmitter and the AR900-32 receiver are well-suited for many diverse applications, including distribution of audio entertainment content throughout a building, home theater installations, commercial and industrial surveillance, monitoring, security, etc.
RCA phono-type jacks). To connect any of these to the transmitter, use the supplied adaptor in conjunction with the standard dual cable to make the connection. Figure 1 – AT900-32 Transmitter (Rear Panel) Note 1: If the audio source device provides only a single (mono) output, a “Y” adaptor (not supplied) may be used to feed the signal to both of the transmitter’s input jacks.
Figure 2 – AR900-32 Receiver (Rear Panel) Connecting Power to the Transmitter and Receiver The AT900-32 and the AR900-32 each require an external power source of between 7.5 and 18 volts DC. A plug-in 120VAC-to-9VDC power converter is supplied with each unit. Insert the power converter’s 2.1mm plug into the DC INPUT jack on the unit’s rear panel (refer to Figures 1 and 2). Plug each converter into a live 120VAC outlet. The transmitter’s red POWER indicator LED (on the front panel) should illuminate.
Set this selector to the “ones” digit of the desired channel Set this selector to the “tens” digit of the desired channel Figure 3 – AT900-32 Transmitter (Front Panel) Selecting the Channel of Operation (Receiver) The AT900-32 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.
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).
IMPORTANT! Properly setting the transmitter’s modulation level is CRITICAL to satisfactory operation of the transmitter, and receiver. If the level is set too low, the receiver will likely be plagued with objectionable background noise (hiss). If the level is set too high, distorted audio and/or interference on adjacent channels is likely to result. Note: The audio source device may have a volume control that adjusts the level of the audio signal(s) being fed to the transmitter’s inputs.
Adjusting Headphone Volume (Receiver) If desired, stereo headphones or earbuds equipped with a standard 3.5mm mini-phone plug may be used with the AR900-32 receiver. Insert the plug into the HEADPHONE jack on the rear panel. The output level at this jack may be adjusted using the VOLUME control on the front panel. Note: The receiver’s VOLUME control only affects the volume at the headphone jack. It does not affect the volume at the receiver’s line level audio output phono jacks.
Transmitter Connection Diagram For maximum range, the transmitter’s antenna must be oriented vertically. Rear panel of transmitter AC Adaptor Dual RCA phono jack to 3.5mm mini phone plug adaptor 3.5mm Stereo Output Jack Right Left Audio Outputs Audio Source Device with RCA phono jack outputs, for example: • CD player • DVD player • Tuner • Satellite radio receiver Audio Source Device with 3.
Receiver Connection Diagram For maximum range, the receiver’s antenna must be oriented vertically. Rear panel of receiver AC Adaptor Left Right Audio Inputs Audio Playback (or Recording) Device with RCA phono jack inputs, for example: • P.A. Amplifier • Stereo Receiver • Audio Recorder 10 Applied Wireless, Inc.
Internal Settings The AT900-32 transmitter and the AR900-32 receiver each have internal jumpers and/or switches (on their respective printed circuit boards) that are preset at the factory to provide the proper configuration for most applications. The following sections describe these settings, and provide guidelines for when it may be necessary or desirable to modify them.
Local/Distance (DX) Jumper (Receiver) The AR900-32 receiver has an internal jumper that determines the receiver’s RF sensitivity. The factory default position for this jumper is the Distance (DX) setting, configuring the receiver for maximum sensitivity. This is the appropriate setting for most applications (to allow for maximum reception range).
Noise Reduction (Transmitter and Receiver) The transmitter and receiver are each equipped with active noise reduction circuits that minimize objectionable background noise (or “hiss”) which might otherwise be noticeable during periods of silence, such as the pause between tracks on a CD. These circuits are normally enabled (factory default).
Technical Specifications AT900-32 Transmitter Operating Frequency (32 Channels) Operating Voltage Range Operating Current Audio Signal-to-Noise Ratio* Audio Frequency Response (+/-3dB)* Audio Channel (L/R) Separation (@ 1KHz)* Audio Distortion (@ 1kHzm +/-25KHz deviation)* Stereo Pilot Level RF Output Power Frequency Stability (over operating temp.range) FM Deviation Harmonic Suppression Antenna Output Impedance Operating Temperature Range Storage Temperature Range 902 – 928 MHz 7.
The following sections pertain exclusively to the Audio Transmitter, Model AT900-32: This product incorporates transmitter module FCC ID: QY4265 This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference and (2) This device must accept any interference received, including interference that may cause undesired operation.
ONE YEAR LIMITED WARRANTY (USA) Products manufactured by APPLIED This warranty is extended to the original WIRELESS, INC. (AW) and sold to purchasers purchaser of the product(s) only, and is not in the USA are warranted by AW according to transferable to any subsequent owner or the following terms and conditions. You should owners of the product(s). AW reserves the right read this Warranty thoroughly.
ONE YEAR LIMITED WARRANTY (USA), cont. • HOW TO OBTAIN WARRANTY SERVICE: If a product covered by this warranty and sold in the USA by AW proves to be defective during the warranty period AW will, at its sole option, repair it or replace it with a comparable new or reconditioned product without charge for parts and labor, when said product is returned in compliance with the following requirements: 1. You must first contact AW at the following address/phone for assistance: APPLIED WIRELESS, INC.
Applied Wireless products are designed and manufactured with pride in the United States of America © Copyright 2007 by Applied Wireless, Inc. All rights reserved. Specifications subject to change without notice. APPLIED WIRELESS, INC. 1250 Avenida Acaso, Camarillo, CA 93012 Phone: 805-383-9600 Fax: 805-383-9001 Email: info@appliedwireless.com www.appliedwireless.com Pub. # UG-ATR90032 Rev.
