Applied Wireless AVT9003A Users Manual

Long Range Wireless Applications

USER’S MANUAL

900 MHz Audio / Video Transmitter
Model No. AVT900-3A

Product Description

Model AVT900-3A from Applied Wireless, Inc. is a high quality transmitter designed to
broadcast standard NTSC or PAL video signals, along with line-level audio signals, to an
appropriate receiver (such as Applied Wireless Inc.’s model AVR900-3). Conforming to
FCC Part 15 requirements for unlicensed use, Model AVT900-3A will transmit over
distances up to 750 feet.* The range may be increased substantially through the use of a
directional antenna (such as a flat panel or yagi) at the receiver.

The AVT900-3A transmitter provides three user-selectable channels of operation to
enable simultaneous operation of multiple transmitters in a common area. The transmitter
incorporates precise FM modulation and sophisticated filters to ensure stable,
interference-free high quality color or B/W video plus audio reception.

The AVT900-3A transmitter is housed in a small yet rugged aluminum extrusion
enclosure (dimensions: 3.25”W x 2.5”L). An AC power converter (12VDC) is supplied,
along with RCA phono-type video and audio cables, as well as a combination multi­conductor power/audio/video cable assembly, for connection to video and audio sources.

The AVT900-3A transmitter is well-suited for many diverse applications, including
distribution of AV entertainment content throughout a building, commercial and
industrial surveillance, monitoring, security, access control, etc.

Using the AVT900-3A in Non-Stationary Applications

If the AVT900-3A is to be used in an application in which it will be moving while
broadcasting (such as with a hand-held video camera, for example), it is strongly
suggested that the Applied Wireless Diversity Receiver (model DAV900-3) be utilized.
This advanced multi-antenna receiver will minimize the effects of multipath interference
to provide more stable video images and audio reproduction. The improvement in
performance is especially noticeable when the distance between the transmitter and
receiver is extended and/or obstructions exist between them.

* Unobstructed, straight line-of-sight range, whe n used with the transmitter’s standard quarter-wave
antenna (included).

Table 1

Specifications

Operating Frequency
Channel 1 907 MHz
Channel 2 915 MHz
Channel 3 923 MHz
RF Output Power 1 mW (0 dBm)
Operating Voltage 7.5 to 18VDC
Operating Current 65 mA
Video Frequency Response 0.5 – 5.0 MHz
Signal to Noise Ratio 60 dB
FM Deviation (@ 1V P-P input) +/- 3 MHz
Differential Gain Error 3% p-p (max)
Differential Phase Error 3% p-p (max)
Harmonic Suppression -45 dBc
Antenna Output Impedance 50 Ohms
Operating Temperature Range

Storage Temperature Range

-20°C to +70°C

-50°C to +150°C

Installation Instructions

Before Beginning the Installation

Plan the installation of the AVT900-3A transmitter carefully. The physical location and
orientation of the unit itself will have a significant influence on reception quality at the
receiver, particularly at longest ranges. The unit, and its standard antenna, should be
positioned vertically (pointing either up or down). If necessary, use double-sided foam
tape or hook & loop fasteners (not supplied) to secure the unit to a vertical surface. Also,
keep in mind that the RF signal from the transmitter will travel through most non-metallic
building materials (wood, stucco, brick, etc.), however maximum stated reception range

is based on unobstructed line of sight conditions.

Selecting the Channel of Operation

Referring to Figure 1, use a small flat-blade screwdriver to select the channel (frequency)
on which the transmitter will broadcast, by aligning the triangle-shaped pointer (not the
screwdriver slot) to the number of the desired channel. Be sure to set the receiver to the
matching channel. Channels are as follows:

Channel 1: 907 MHz
Channel 2: 915 MHz
Channel 3: 923 MHz
Any other setting of the channel selector (0, 4, 5, 6, 7, 8, 9) defaults to Channel 1.

Figure 1 - Front Panel

If two AVT900-3A transmitters are to be used simultaneously in a common area (so as to
broadcast two different audio & video sources), set one unit to Channel 1 and the other
unit to Channel 3. It is not advisable to attempt to use three units simultaneously.

Connecting Audio and Video to the AVT900-3A

Following the guidelines below, connect line level audio and video sources (outputs from
a DVD player, for example) to the corresponding line-level input jacks on the
transmitter’s rear panel (refer to Figure 2).

Audio – If a microphone is to be used as the audio source, an external microphone
preamp (not supplied) must be used to raise the microphone’s output signal to the
required line level.

Video – The AVT900-3A’s video input presents a terminated 75-ohm load to the output
of the video source device. Accordingly, no other device(s) besides the AVT900-3A
should be connected to the video source. If any additional device(s) must be driven by the
source device, a video distribution amplifier (not supplied) must be used.

Figure 2 – Rear Panel

Connecting Power to the AVT900-3A

The AVT900-3A requires an external power source of between 7.5 and 18 volts DC. A
plug-in power converter (12VDC) is supplied with the AVT900-3A. If preferred, a
battery (not supplied) may be used instead of the power converter. A 9volt alkaline
battery will operate the transmitter continuously for several hours.

CAUTION: Do NOT apply power to the AVT900-3A unless the
supplied antenna is attached to its mating jack on the front panel.
Powering the transmitter without an antenna may result in failure
of the transmitter’s RF output device and void the warranty.

To use the supplied power converter, insert its 2.1mm plug into the DC IN jack on the
transmitter’s rear panel (refer to Figure 2). Plug the converter into a live 120VAC outlet.
The transmitter’s red Power indicator LED (on the front panel, refer to Figure 1) should
illuminate.

To connect a battery, refer to Figure 3 and Table 2.

Using the Combination Power/Video/Audio Input Cable

As an alternative to the standard audio/video interconnect cable, the supplied
combination Power/Video/Audio cable assembly may be used to connect the
AVT900-3A. The red and black wires of the cable may be used to connect a suitable
battery (if the plug-in power converter will not be used). Connect the red wire to the
positive (+) terminal of the battery; connect the black wire to the negative (-) terminal of
the battery.

Plug the Combination cable’s audio (white) and video (yellow) plugs into the
corresponding line level output jacks on the source device.

Referring to Figure 3, the pinout of the transmitter’s Combination Power/Video/Audio
jack, and its mating plug on the Combination cable, is detailed in Table 1.

Combination Jack

(on Front Panel)

Combination Connector Pinout

Pin Circuit

1 DC Power In (+7.5 to +18 volts)
2 DC Ground
6 Video In (+)
3 Video Ground
5 Audio In (+)
4 Audio Ground

Figure 3

Combination Cable

Plug (rear view)

Table 2

INSTRUCTION TO THE USER (required by the FCC)

This equipment has been tested and found to comply with the limits for a class B digital
device, pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and if not installed and
used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following
measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the

receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

This equipment has been certified to comply with the limits for a class B computing
device, pursuant to FCC Rules. In order to maintain compliance with FCC regulations,
shielded cables must be used with this equipment. Operation with non-approved
equipment or unshielded cables is likely to result in interference to radio and TV
reception. The user is cautioned that changes and modifications made to the equipment
without the approval of manufacturer could void the user’s authority to operate this
equipment.

© Copyright 2006 by Applied Wireless, Inc. All rights reserved.

Specifications subject to change without notice.

Applied Wireless, Inc. 1250 Avenida Acaso, Camarillo, CA 93012

Phone: [phone] Fax: [phone]

Email: [e-mail]

www.appliedwireless.com