Professional UHF
Wireless Systems
ATW-A20 Ground-plane Antenna System
Installation and Operation
Audio-Technica U.S., Inc.,
1221 Commerce Drive, Stow, Ohio 44224 330/686-2600 www.audio-technica.com
Audio-Technica Limited,
Old Lane, Leeds LS11 8AG England 0113 277 1441 www.audio-technica.co.uk
P51448-01 ©2004 Audio-Technica U.S., Inc. Printed in Taiwan
The ATW-A20 consists of two base assemblies and twelve antenna rods. For
optimal reception, interchangeable antenna rods correspond to the operating
frequency of the wireless system being used.
To assemble, screw three of the silver-tipped antenna rods into the downward-
angled connectors of each base assembly. These bottom antennas are used for
all operating frequencies.
Using the table below, select the top antenna rods (distinguished by tip color)
that correspond with the operating frequency of the wireless system. Screw the
appropriate antenna rod into the top of each base assembly.
UHF Frequency Range
Antenna Tip Color
541-686 MHz
Brass
728-746 MHz
Silver
800-865 MHz
Black
Connect the ATW-A20 ground-plane antennas to the antenna inputs of either a
wireless receiver or an antenna distribution system. Use RG58 cable for cable
lengths of up to 25'. For cable lengths greater than 25', RG8 (low loss) RF cable
is recommended. RG8 cable lengths over 100' may cause significant signal loss.
For best performance, the two ground-plane antennas should be at least 3'
apart. Some experimentation with positioning may be required. For optimum
operation, at least one antenna should remain within sight of the wireless
microphone transmitter at all times.
The
5
/
8
"-27 threads in the end of the base assembly will mate with any standard
microphone stand or
5
/
8
"-27 stand adapter.
One-Year Limited Warranty
Audio-Technica brand products purchased in the U.S.A. are warranted for one year from date of purchase by Audio -Technica U.S., Inc. ( A.T.U.S.)
to be free of defects in materials and workmanship. In event of such defect, product will be repaired promptly without charge or, at our option,
replaced with a new product of equal or superior value if delivered to A.T.U.S. or an Authorized Service Center, prepaid, together with the sales
slip or other proof of purchase date.
Prior approval from A.T.U.S. is required for return.
This warranty excludes defects due to normal wear,
abuse, shipping damage, or failure to use product in accordance with instructions. This warranty is void in the event of unauthorized repair or
modification, or removal or defacing of the product labeling.
For return approval and shipping information,
contact the Service Dept., Audio -Technica U.S., Inc., 1221 Commerce Drive, Stow, Ohio 44224.
Except to the extent precluded by applicable state law,
A.T.U.S. will have no liability for any consequential, incidental, or special damages; any
warranty of merchantability or fitness for particular purpose expires when this warranty expires.
This warranty gives you specific legal rights, and you may have other rights which vary from state to state.
Outside the U.S.A., please contact your local dealer for warranty details.
Figure 1
ATW-A20 Ground-plane Antenna System
Antenna Rod
Antenna Cable
(not included)
BNC Connector
Base Assembly
5
/
8
"-27 Threads
