ATW-A49
UHF Wideband LPDA Antennas, 440-990 MHz
CAUTION!
• For personal safety and reliable system operation, make certain
that (1) the antennas are mounted clear of any physical contact
with individuals, (2) any supporting structures used are stable,
even if moved or bumped, and (3) the antennas are securely
attached to the supporting structures.
• In addition, to reduce the risk of electric shock, do not allow the
antennas or their supporting structures to come in contact with
any exposed wiring or other sources of electricity.
Description
Audio-Technica ATW-A49 UHF wideband LPDA (Log Periodic Dipole Array)
antennas provide enhanced signal pickup for UHF wireless systems
operating over 440–990 MHz, a remarkable 2-to-1 frequency range. This
bandwidth includes all UHF TV channels globally (14–69, 470–806 MHz).
Supplied in pairs, these directional antennas are ideal for extending the
operating range and reliability of diversity UHF wireless systems. They
also eliminate the need for multiple frequency-specific antennas.
The ATW-A49 is designed for applications requiring increased distance
between the transmitter and the receiver—as in stadiums, concert tour
venues, theater and large performance areas, or any area where line-of-
sight may be obstructed. This ruggedly constructed paddle-style antenna
is equally suited for installed and portable applications.
The antennas are compatible with virtually all UHF wireless receivers
and provide a directional coverage pattern with a typical beamwidth of
90 degrees. They offer approximately 6 dB of RF gain improvement over
standard receiver whip antennas. Antenna impedance is 50 ohms.
The antennas are constructed of industrial-grade copper-clad epoxy
fiber-glass. This heavy-duty, durable construction is engineered to resist
the effects of corrosion, UV degradation and vibration, providing long life
and stable performance under difficult operating conditions. High-quality,
low-loss BNC connectors are positioned to minimize RF cable strain. The
antennas are supplied completely assembled.
Installation and Operation
Location
• For best performance, the antennas should be mounted:
• Above head-height,
• In direct line-of-sight to the likely transmitter location(s),
• At least 3' (1 m) away from each other, and
• At least 3' (1 m) away from any large metal objects or sources
of interference.
In addition, the length of RF cable run to the receiver should be
minimized. Some experimentation with antenna positioning may be
required to determine the best locations under typical conditions.
Important: While the antennas themselves are weather resistant, outdoor
use should be temporary only and under dry conditions. Any moisture or
corrosion in BNC cable connectors or associated cables can greatly affect
RF performance at these frequencies.
Mounting
The ATW-A49 mounts to a
5
/
8
"-27 threaded fitting. The antenna mount
is designed to allow for vertical tilt adjustment through a 90°range.
Horizontal adjustment is accomplished by rotating the antenna in the
mounting fitting. For portable applications, the antenna may be installed
on a standard
5
/
8
"-27 thread microphone stand.
Connections
After the antennas have been installed, connect them to the antenna
inputs of either a wireless receiver or an antenna distribution system.
Use RG58-type cable for cable lengths of up to 25' (8 m). For cable
lengths greater than 25', RG8-type low-loss RF cable is recommended.
RG8-type cable lengths over 100' (30 m) may cause significant signal
loss. Because cable requirements vary considerably from one installation
to another, RF cables are not included. High-quality, pre-terminated RF
cables available from Audio-Technica will be found listed on the back page
under “Optional Accessories.”
Optional Accessories
AC12
RG58-type antenna cable, 12' (3.65 m) long, terminated with
BNC connectors.
AC25
RG8-type low-loss antenna cable, 25' (7.62 m) long, terminated
with BNC connectors.
AC50
RG8-type low-loss antenna cable, 50' (15.24 m) long, terminated
with BNC connectors.
AC100
RG8-type low-loss antenna cable, 100' (30.48 m) long, terminated
with BNC connectors.
