Samson UHF Series One User manual

SAMSON®
•dbx® Noise Reduction
TRUE
DIVERSITY
WIRELESS
SYSTEM
UR-4 RECEIVER
UT-4 BELT PACK TRANSMITTER
UH-4 HAND-HELD MICROPHONE TRANSMITTER
UHF
SERIES
DA-5H UHF ANTENNA DISTRIBUTION AMPLIFIER

Introduction 1
System Features 3
Guided Tours 5
UR-4 Front Panel 5
UR-4 Rear Panel 7
UT-4 9
UH-4 12
Setting Up and Using the
UHF Series System 15
About dbx®Noise Reduction 19
Trouble-shooting 20
UT-4 Multi-pin Lavalier Wiring Guide
and Chart 23
About The DA-5H UHF Antenna
Distribution Amplifier 26
Guided Tour - DA-5H Front Panel 27
Guided Tour - DA-5H Rear Panel 28
Setting Up and Using the DA-5H 29
DA-5H Grounding Techniques 31
Glossary of Terms 32
Specifications 34

Introduction
Congratulations on purchasing the Samson UHF Series True Diversity
System! Although this product is designed for easy operation, we sug-
gest you take some time out first to go through these pages so you can
fully understand how we’ve implemented a number of unique features.
Every wireless system consists of at least two components—a receiver
and a transmitter, both of which must be tuned to the same channel (that
is, the same radio frequency) in order to operate correctly.* The UHF
Series System you have purchased contains a UR-4 receiver and either
our UT-4 belt-pack transmitter (for lavalier microphone, headset micro-
phone, and guitar applications) or our UH-4 hand-held microphone trans-
mitter. The illustration below shows an overview of our system design:
* Your receiver and transmitter have been factory preset to utilize the
same channel. A listing of the six available channels and their corre-
sponding UHF frequencies can be found on page 34 of this manual.
1
SERVO- 240
SAMSON
OPEN
OPEN
INPUT
UT-4
SAMSON
Beltpack Transmitter
UHFSynth Series SAMSON
MPL2242
MPL2242
SAMSON
UHFWirelessReceiver
ANT-A50 Ω
938-952MHz
UHF Series
5
4
3
2
1
0
6
7
8
9
10
10
9
8
7
6
5
4
3
2
1
A B +6
+3
0
-3
-6
-10
-15
-20
-25
-30
dB
Channel
AB
DIVERSITY
Mute
Power
dbx
NOISE
REDUCTION
UR-4
UR-4
A-1947.125MHz
ANT-A50 Ω
938-952MHz
ON
OFF
VOLUME RFLEVEL AFLEVEL

Introduction
The concept behind a “true diversity”wireless system is that a single
chassis houses two discrete receivers (called “channel A”and “channel
B”) instead of one, with both tuned to the same frequency but with each
using an independent antenna. A built-in computer chip then
continuously scans the two receivers and determines which one has the
clearest and strongest reception, automatically (and silently) switching to
that channel. This allows you to maintain the wireless communication
link over a much broader area range than would be allowed by a single
receiver and also virtually eliminates interference and phase cancellation
problems. In addition, our special circuitry, which utilizes the UHF (Ultra
High Frequency) band, delivers the highest-quality sound available in
any wireless system. Finally, the provision of dbx®noise reduction*
produces crystal-clear sound with minimized background noise and hiss.
Your UHF Series True Diversity System may also optionally include a
DA-5H UHF Antenna Distribution Amplifier. For more information on this
device, see pages 26 - 31.
In this manual, you’ll find a more detailed description of the features of
this system, as well as a guided tour through all components, step-by-
step instructions for setting up your system, trouble-shooting tips, wiring
diagrams and tables, a glossary of terms, and full specifications. You’ll
also find a warranty card enclosed—don’t forget to fill it out and mail it!
This will enable you to receive online technical support and will allow us
to send you updated information about these and other Samson prod-
ucts in the future.
SPECIAL NOTE: Should any component of your UHF Series True
Diversity Wireless System ever require servicing, a Return Authorization
number (RA) is necessary. Without this number, the unit will not be
accepted. Please call Samson at 1-800-372-6766 for a Return
Authorization number prior to shipping your unit. Please retain the
original packing material and, if possible, return the unit in its original
carton and packing materials.
* dbx is a registered trademark of Carillon Industries.
2

System Features
The Samson UHF Series True Diversity System utilizes state-of-the-art
technology in wireless communications. Here are some of its main
features:
•The use of the UHF (Ultra High Frequency) band as opposed to VHF
(Very High Frequency). This yields better signal-to-noise ratio and
improved frequency response—in plain English, superior sound
quality. The UHF band is also considerably less crowded than VHF,
thus minimizing potential interference problems. In addition, our
special dielectric filtering circuitry (which, incidentally, is based upon
cellular phone technology) provides extra narrow bandwidths, thus
further reducing interference.
•Six available channels that can be used in the same location
simultaneously. This maximizes the system’s effectiveness in UHF
multi-system venues and ensures noise-free performance when
used side by side with VHF systems in crowded RF environments.
•True Diversity technology, which greatly extends the effective range
of the system and also virtually eliminates interference and phase
cancellation problems.
•Built-in dbx®noise reduction circuitry in both the transmitter and
receiver. This ensures clear, transparent sound with an absolute
minimum of background noise and hiss.
•The UR-4 receiver provides a clear, easy-to-read visual display that
shows continuous RF (Radio Frequency) level (indicating the
strength of the received signal) as well as AF (Audio Frequency)
level.
•The UR-4 receiver offers both balanced and unbalanced audio out-
puts, making it compatible with all types of external audio mixers and
amplifiers.
•Tuned coaxial receiver antennas are included, with options for rear-
mounting or remoting if extended range is required.
•The UT-4 and UH-4 transmitters both accept standard 9-volt alkaline
batteries.
3

System Features
•The UT-4 belt-pack transmitter is extremely light-weight (less than 4
ounces with a 9-volt battery installed) and is suited for a wide range
of lavalier microphones, headset microphones and instruments
such as electric guitar and bass. It also provides phantom
powering, making it compatible with professional condenser lavalier
and headset microphones.
•The UH-4 hand-held microphone transmitter features an all-brass
housing painted with a durable epoxy base. The unit is finished in a
smooth, non-glare black neoprene covering to ensure a firm, com-
fortable grip. A selection of mic capsules are available, including:
Electro Voice 757 N/DYM Dynamic
Electro Voice 857 N/DYM Dynamic
Sennheiser MKE-4032 Condenser
Shure SM58 Dynamic
Shure SM85 Condenser
Shure SM87 Condenser
•Both the UT-4 and UH-4 transmitters provide “popless”muting,
which turns off the audio signal while leaving the carrier signal on.
•Both the UT-4 and UH-4 transmitters offer Sensitivity controls that
adjust the transmitter input level for different user sound pressure
levels and different mic capsules or lavalier/headset microphones.
•All components have rugged construction that ensures reliable
operation in even the most demanding performance environments.
4

Guided Tour - UR-4 Front Panel
1: Power switch - Use this to turn the main power on and off. When
the receiver is on, both the “Power”and “Diversity”LEDs in the display
section (see #4d and #4f on the following page) will be lit.
2: Antenna A and B mountings - Connect the supplied antennas to
these mountings. Third-party receiver antennas should not be
substituted—use only the antennas provided with your receiver.
3: Volume control - This knob determines the level of the audio signal
being output through both the balanced and unbalanced output jacks on
the rear panel.
4: Display section - Shows information about the current status of the
receiver.
4a: RF (Radio Frequency) Level “A”/“B” display - This “ladder”
display (similar to the VU bar meter used on audio devices) continuously
indicates the strength of the UHF signal being received by antennas A
and B. When all ten segments are lit, the incoming signal is at maximum
strength; when only the lowest segment is lit, the incoming signal is at
minimum strength. If no segments are lit, no signal is being received;
check to ensure that the transmitter is on and that the transmitter and
receiver are set to the same channel (see the “Trouble-shooting”section
on page 20 for more details). 5
1
2342
SAMSON
UHF Wireless Receiver
ANT- A 50 Ω
938 - 952MHz
UHF Series
5
4
3
2
1
0
6
7
8
9
10
10
9
8
7
6
5
4
3
2
1
A B + 6
+ 3
0
- 3
- 6
-10
-15
-20
-25
-30
dB
Channel
AB
DIVERSITY
Mute
Power
dbx
NOISE
REDUCTION
UR-4
UR-4
A-1 947.125MHz
ANT- A 50 Ω
938 - 952MHz
ON
OFF
VOLUME RF LEVEL AF LEVEL
10
9
8
7
6
5
4
3
2
1
A B + 6
+ 3
0
- 3
- 6
-10
-15
-20
-25
-30
dB
Channel
AB
DIVERSITY
Mute
Power
dbx
NOISE
REDUCTION
4a 4b
4c
4d 4e 4f

Guided Tour - UR-4 Front Panel
4b: AF (Audio Frequency) Level display - This “ladder”display
(similar to the VU bar meter used on audio devices) indicates the
strength of audio output signal. For optimum signal-to-noise ratio,
adjust the Volume knob (see #3 on the previous page) so that the “0”
segment (third from the top) lights frequently, with only occasional
excursions into the “+3”and “+6”segments. If none of these segments
are lit, little or no signal is being output; see the “Trouble-shooting”
section on page 20 for more details.
4c: “A”/“B”LEDs - These LEDs show you whether signal from the “A”
or “B”receiver is currently being used; when signal is being received,
one of them will be lit. A computer chip inside the UR-4 constantly
scans the two and automatically selects whichever is receiving the
strongest, clearest signal. This “true diversity”switching is completely
inaudible, but it effectively increases overall range while reducing poten-
tial interference and phase cancellation problems.
4d: “Diversity”LED - Lights whenever the UR-4 is powered on.
4e: “Mute”LED - Lights to indicate the absence of carrier signal.
When “MUTE”is lit, either the transmitter Mute switch is in the “on”
position or the transmitter’s channel does not match that of the receiver.
4f: “Power”LED - Lights whenever the UR-4 is powered on.
6

7
Guided Tour - UR-4 Rear Panel
1: AC input - Connect the supplied standard 3-pin “EEC”plug here.
2: Balanced output* - Use this electronically balanced low impedance
(600 Ohm) XLR jack when connecting the UR-4 to professional (+4)
audio equipment. Pin wiring is as follows:
* If required, both the balanced and unbalanced outputs can be used
simultaneously.
12
344
DISTRIBUTOR A
SAMSON
SAMSON TECHNOLOGIES CORP.
HICKSVILLE, NEW YORK, U.S.A.
UHF RECEIVER MODEL No.UR-4
ANT - A
120V~60Hz 15W
POWER
RATING
!
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION
ATTENTION: RISQUE DE CHOC
ELECTRIQUE NE PAS OUVRIR.
ATTENTION: ANTENNA CONNECTIONS ARE POWERED BY DC 9V
MANUFACTURED UTILIZING TECHNOLOGY, LICENSED FROM CARILLON TECHNOLOGY INC.
DBX IS A REGISTERED TRADEMARK OF CARILLON ELECTRONICS CORPORATION.
ANT - A BALANCED OUTPUT
-60dBm.600Ω
UNBALANCED
OUTPUT
-10dBv.5KΩ
GND
HOT
COLD
1
2
3
FCC ID 8GPUR - 4
MADE IN JAPAN
3 - SIGNAL
2 + SIGNAL
1 GROUND +

8
Guided Tour - UR-4 Rear Panel
3: Unbalanced output* - Use this unbalanced high impedance (5K
Ohm) 1/4”jack when connecting the UR-4 to consumer (-10) audio
equipment. Wiring is as follows:
4: Rear-mount antenna knockouts - The receiver antennas can
optionally be mounted at these areas of the rear panel. Contact
Samson Technologies for information about our rear-panel antenna
mounting kit.
* If required, both the balanced and unbalanced outputs can be used
simultaneously.
+ SIGNAL
GROUND
+ SIGNAL GROUND