Lectrosonics QUADUHFD User Manual
QUADUHFD
MULTI-CHANNEL WIRELESS SYSTEM
WITH RF/POWER DISTRIBUTION
OPERATING INSTRUCTIONS
and trouble-shooting guide
LECTROSONICS, INC.
Rio Rancho, NM USA
www.lectrosonics.com
INTRODUCTION
The design of Lectrosonics Quad Pak systems has evolved over the years as a
result of suggestions garnered during many conversations with industry sound
mixers and production engineers. These suggestions, together with meticulous
attention to design and construction details, have resulted in a system that offers
portability, versatility, and “bullet-proof” reliability of operation.
The QUADUHFD system is a high performance, 4-channel wireless microphone
receiver system designed primarily for motion picture and television production in
the studio and in the field. The QUADUHFD is a dual-antenna, diversity design for
up to four UCR195, UCR195D, UCR200D, UCR205D or UCR210D diversity receivers. The European specification UCR300 receivers can also be installed.
Complete QUADUHFD systems consist of a rugged mechanical assembly with builtin rechargeable batteries for up to four receivers, one or two RF/power multi-couplers (depending upon the receivers installed) and various options for antennas and
chargers to meet a wide variety of applications. The mechanical assemblies are
covered with a padded, naugahyde carrying case with reinforced, zippered and
hinged front and rear panels for easy access to controls and connectors.
Problems such as interaction of receivers, intermodulation and desensitization have
been eliminated with the use of proven design principles in the active antenna multicouplers.
TABLE OF CONTENTS
INTRODUCTION ................................................................................................... 2
GENERAL TECHNICAL DESCRIPTION ............................................................. 3
FRONT PANEL DESCRIPTION............................................................................ 4
REAR PANEL DESCRIPTION .............................................................................. 5
INSTALLATION ...................................................................................................... 6
OPERATING INSTRUCTIONS ............................................................................. 6
TROUBLESHOOTING ........................................................................................... 7
SPECIFICATIONS ................................................................................................. 8
SERVICE AND REPAIR ........................................................................................ 9
RETURNING UNITS FOR REPAIR ...................................................................... 9
WARRANTY ........................................................................................... Back cover
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Multi-channel Wireless System
GENERAL TECHNICAL DESCRIPTION
The QUADUHFD consists of three sub-systems; the housing which contains the gel-cell power supply, the UDM6
RF/power distribution module and the UDM6S RF distribution module.
The housing is constructed of machined aluminum. A strap handle is bolted directly to the top panel of the housing
for ease of carrying. The lead-acid gel-cell batteries are connected in series to provide 12 VDC (nominal) power to
all the modules installed into the system. These batteries were selected for their recharge characteristics and
reliability under extreme conditions. The batteries are also highly resistant to damage caused by prolonged deep
discharge.
The front end design places RF filtering before gain to minimize intermodulation (IM) products and prevent overload.
Two transmission line ceramic resonators at the input provide filtering with a 50 MHz bandwidth. Following the
resonators is a low noise, low gain RF amplifier designed to evenly compensate for splitter losses in the stage that
follows. A precision splitter/isolator divides the RF signal into four isolated signals, which prevents spurious RF
coupling between receivers. The splitter/isolator is also termination independent, which prevents mismatched or
disconnected RF outputs from affecting the other receivers.
Power can be supplied to the distribution module from four possible sources. The primary source is the gel-cell
battery pack built into the bottom of the housing. Secondly, power may also be provided through an external DC
power source of 12 to 16 VDC of either polarity. When an external source is connected, an internal relay automatically disconnects the internal battery pack. If that DC source fails or is disconnected, the system automatically
reverts to the internal batteries. AC power can be provided through the charger included with the unit. While operating in the AC mode, the internal batteries are also recharged. All power circuits in the distirbution module are
independently protected by internal auto-reset fuses. If the power to one receiver fails, the other receivers will
continue to operate.
120V AC
CH80
EXTERNAL
12V DC
ANTENNA
3
4
1
4
5A
THERMAL
FUSE
2
3
AUTO
SWITCHING
RELAY
FRONT-END
RESONATORS
CHARGING
CIRCUIT
CERAMIC
BUILT-IN
RECHARGEABLE
BATTERIES
RF
AMP
CONTROL
MAIN
SWITCH
SPLITTER
&
ISOLATOR
THERMAL
750mA
FUSES
RF TO
RECEIVERS
12V DC
POWER TO
RECEIVERS
12V DC TO
UDM6S
DISTRIBUTION
MODULE
UDM6 Block Diagram
Rio Rancho, NM – USA
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