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The RMS 2020 System is noted for its ease of use. If
however you need advice or technical support at any
time please contact Audio Ltd.
All products come with free lifetime technical support,
and we are also always pleased to help users of our
equipment, whatever the application.
Audio Ltd,
Audio House
Progress Road
High Wycombe
Bucks, HP12 4JD
U.K.
Tel: +44 (0)1494 511711
Fax: +44 (0)1494 539600
email: info@audioltd.com
World Wide Web: http://www.audioltd.com
Copyright © 1999 Audio Limited
Part no: RMS 2020U/1
This guide was produced by
Human Computer Interface Limited,
http://www.interface.co.uk
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Contents
Introduction 4
The RMS 2020 System ......................................................... 4
Diversity reception ............................................................... 6
Selecting frequencies ......................................................... 6
DX 2020 Receiver 7
Controls, displays, and connections ................................. 7
Setting up the DX 2020 ......................................................... 8
Technical specification ..................................................... 10
TX 2020 Pocket Transmitter 11
Controls, displays, and connections ............................... 11
Setting up the TX 2020 ....................................................... 12
Technical specification ..................................................... 13
HX 2000 Hand Held Transmitter 14
Controls, displays, and connections ............................... 14
Setting up the HX 2000 ....................................................... 15
Holding the HX 2000 ........................................................... 16
Technical specification ..................................................... 17
RK␣ 2 Minirack 18
Controls, displays, and connections ............................... 18
Setting up the RK␣ 2 ............................................................. 19
Setting the output phase ................................................... 20
Technical specification ..................................................... 20
DK 2000 Rack 21
Controls, displays, and connections ............................... 21
Setting up the DK 2000 ....................................................... 23
Audio monitoring ................................................................ 24
Bargraph display ................................................................ 24
Technical specification ..................................................... 24
Troubleshooting 25
Cable wiring diagrams 27
Index 30
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CHAPTER
1
Introduction
This chapter gives a general introduction to radio
microphones, and shows how the RMS 2020 Series
products interrelate.
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Audio Limited
Audio Limited has been designing and manufacturing
broadcast quality radio microphone systems for over
thirty-five years and over this period they have become
the choice of professional sound mixers around the
world.
Audio Limited’s systems have acquired an acclaimed
reputation for reliability and transparent sound quality
through our commitment to designing products with
maximum input from the customer.
All products designed by Audio Limited are a result of
listening to our customers.
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The RMS 2020 System
The RMS 2020 is a 32-channel synthesised diversity
radio microphone system designed to give extremely
clear sound combined with world wide compatibility.
The illustration opposite shows the products in the
RMS 2020 System.
TX 2020
The small battery-powered pocket transmitter for use
with a range of lapel microphones.
HX 2000
A hand-held transmitter for use with a range of highquality Schoeps microphone capsules.
DX 2020
The diversity receiver in the RMS 2020 System, it can be
used as a portable receiver, with a camcorder, or
mounted in an RK 2 or DK 2000 rack.
RK 2 Minirack
Allows two DX 2020 receivers to be mounted in a
compact portable rack.
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TX 2020
HX 2000
DX 2020
Receiver
Rk2 Mini-Rack
Receivers
Receivers
DK 2000 Rack
Aerial
Introduction
DK 2000 Rack
Allows up to four DX 2020 receivers to be mounted and
powered in a portable rack, with visual and headphone
monitoring.
All the UHF products from the RMS 2000 range are
directly compatible with the RMS 2020 range.
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Diversity reception
When electromagnetic waves are radiated by a moving
transmitter, the receiver picks up reflected signals from
surrounding structures as well as the directly radiated
signal. These reflected signals combine with the direct
signal, and in the case where the combining signals are
out of phase with each other, a drop-out or loss of signal
results.
To eliminate this cancellation effect Audio Limited
employ the true diversity technique in the DX 2020
receiver.
The DX 2020 receiver incorporates two separate
receivers fed by separate antennae. A comparator
circuit compares the RF levels from the two receivers
ensuring that the receiver will always switch to the
strongest signal. A noiseless switching circuit takes full
advantage of the accurate level detection to allow
switching as often as needed without noise or clicks.
The result is a reliable, dropout free, broadcast-quality
audio signal indistinguishable from a line microphone.
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Selecting frequencies
The RMS 2020 System provides a choice of 32 operating
frequencies, in two banks in the UHF 470MHz to
1000MHz range. This gives the flexibility of allowing
several sets of receivers and transmitters to be
operated in the same area without interference.
Introduction
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CHAPTER
2
DX 2020 Receiver
The DX 2020 diversity receiver in the RMS 2020
range can be used, in conjunction with a TX 2020 or
HX 2000 transmitter. Alternatively, up to four DX 2020
receivers can be rack mounted for applications
where multiple wireless microphone systems are
required.
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Controls, displays, and connections
Bottom panel
Headphone
level
Battery
compartment
RX1
RX2
TX low
battery
RX low
battery
No
signal
On
Off
F1
F2
Batteries
Holds three DL123A 3 volt Lithium batteries.
RX1/RX2 indicators
Indicate which of the unit’s two built-in receivers is
active at any time.
TX/RX low battery indicators
Illuminate when the unit detects low battery power in
either the TX 2020 Pocket Transmitter or DX 2020
Receiver. The units should not be used when a low
battery power indicator is illuminated as poor operation
may result.
No-signal indicators
Illuminated when no carrier signal is being received,
such as when the transmitter is switched off or set to an
incorrect frequency.
On/Off
Switches the power on or off. Additionally the output
cable includes a link which disconnects power when
the Lemo plug is removed, in which case the switch can
be left on.
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F1/F2
Selects between the two banks of 16 frequencies; see
Selecting the operating frequency
, page 9.
Headphone level
Adjusts the headphone level output. Use a small
screwdriver to turn the control.
Top panel
Antenna 2
Rack connector
Audio
output
Antenna 1
Audio output
Provides balanced microphone level and adjustable
headphone outputs.
Antenna 1/Antenna 2
SMA sockets to which the antennae are connected.
Rack connector
The multiway connector is for use with the DK 2000 and
the RK 2 rack systems.
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Setting up the DX 2020
To set up the DX 2020 in conjunction with a TX 2020 or
HX 2000:
• Fit the batteries.
• Set the transmitter and receiver to the same
operating frequency.
• Connect the RX1 and RX2 antennae.
• Switch on.
• Connect the audio output cable.
• Check that one of the RX1 and RX2 indicators is
illuminated, and that the ‘No signal’ indicators are not
illuminated.
These steps are explained below:
Fitting the batteries
To open the battery compartment, press the release
button and flip the cap. Insert three DL123A 3 volt
Lithium batteries, negative contact first as shown on the
side of the unit, and close the cover. Do not use
excessive force.
DX 2020 Receiver
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Selecting the operating frequency
Select the operating frequency you want to use from the
label on the side of the DX 2020. Set the F1/F2 switch to
F1 (first column of frequencies) or F2 (second column of
frequencies). Rotate the switch on the side of the DX
2020 using a small screwdriver to select the frequency, 1
to 16.
Switch the DX 2020 off and back on again to enable the
change in frequency.
Connecting the antennae
Connect the antennae to the SMA connectors marked
RX1 and RX2. Connect the straight antenna to one
socket and the right-angled antenna to the other socket.
Indicators during correct operation
The DX 2020 should switch between the RX1 and RX2
receivers for best reception, as indicated by the RX1
and RX2 indicators:
RX1 RX2
The ‘No signal’ indicators will not be lit if the
corresponding TX 2020 transmitter is on.
External powering
If the DX 2020 receiver is to be externally powered,
ensure that the appropriate cable is used.
DX 2020 Receiver
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Technical specification
Size 147 x 64 x 20mm
Weight 250g
Temperature range -20˚C to +55˚C
Frequency range 470MHz–1000MHz
Number of frequencies 32
Balanced output level -26dBm
Batteries 3 x 3V DL123A Lithium
Battery life Approximately 10 hours
External power 9–14V DC via
6-pin Lemo™ socket
Certified
DX 2020 Receiver
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