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.