Samson DA-5L User manual

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

Introduction 1
System Features 3
Guided Tours 5
UR-5/UR-5D Front Panel 5
UR-5/UR-5D Rear Panel 8
UT-5 10
UH-5 13
Setting Up and Using the
UHF Synth System 16
About dbx®Noise Reduction and
Tone Squelch 20
Trouble-shooting 21
UHF Synthesized Frequency Chart 24
UT-5 Multi-pin Lavalier Wiring Guide
and Chart 25
About The DA-5L UHF Antenna
Distribution Amplifier 28
Guided Tour - DA-5L Front Panel 29
Guided Tour - DA-5L Rear Panel 30
Setting Up and Using the DA-5L 31
DA-5L Grounding Techniques 33
Glossary of Terms 34
Specifications 36

Introduction
Congratulations on purchasing the Samson UHF Synthesized True
Diversity Wireless System! Although this product is designed for easy
operation, we suggest 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 transmit-
ter and a receiver. The Samson UHF Synth System you have
purchased contains either our UT-5 belt-pack transmitter (for lavalier
microphone, headset microphone, and guitar applications) or our UH-5
hand-held microphone transmitter. The matching receiver is either our
UR-5 single diversity model (for reception of a single monophonic
signal), or our UR-5D dual diversity model (for reception of two mono-
phonic signals or a stereo signal). Here’s an illustration that shows an
overview of our system design:
1
SERVO- 240
SAMSON
SAMSON
UHF SYNTHESIZED DIVERSITY RECEIVER
ANTENNA - A
UHFSynth Series
5
4
3
210
67
8
9
UR-5
UR-5
GROUP 5
4
3
2
10
678
9
10
AF LEVEL
5
4
3
21
6
7
8
9
CHANNEL
0
ANTENNA - B
POWER
AVAILABLE / MUTE
12345
12345
AB
RFLEVEL
AFLEVEL
dbx
NOISE
REDUCTION
OPEN
OPEN
INPUT
UT-5
SAMSON
Beltpack Transmitter
UHFSynth Series SAMSON
MPL2242
MPL2242

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 continu-
ously scans the two receivers and determines which one has the clear-
est 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 cancella-
tion 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 Synthesized True Diversity System may also
optionally include a DA-5L UHF Antenna Distribution Amplifier. For
more information on this device, see pages 28 - 33.
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 Synthesized 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 origi-
nal 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 Synthesized True Diversity System utilizes state-of-
the-art technology in wireless communications. Here are some of its
main features:
•74 available channels organized in 10 different groups in both the
receiver and transmitter, with up to 11 channels available for simulta-
neous use. This makes our UHF Synth System the ideal choice in
multi-user environments such as stage productions and live band
performance. It is also specifically suited for systems that travel into
“hostile”RF environments (such as highly populated urban areas,
where large numbers of radio transmissions occur simultaneously
over broad bandwidth areas).
•The use of the UHF (Ultra High Frequency) band as opposed to VHF
(Very High Frequency), which 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.
•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.
•A clear, easy-to-read visual display that shows continuous RF
(Radio Frequency) level (indicating the strength of the received sig-
nal) as well as AF (Audio Frequency) level. The RF level display also
shows the clearest frequency to use in crowded wireless environ-
ments.
•Balanced and unbalanced audio outputs on both the UR-5 and
UR-5D receivers, making them compatible with all types of external
audio mixers and amplifiers.
3

System Features
•The UT-5 and UH-5 transmitters both accept standard 9-volt
alkaline batteries, and the UR-5 and UR-5D receivers can accept
any AC power voltage from 100 - 250 volts, without the need to
change a voltage selector switch (our special current and voltage
sensing circuitry does the job automatically for you).
•Tuned coaxial antennas are included, with options for rear-mounting
or remoting if extended range is required.
•The UR-5D dual receiver actually contains two separate true
diversity receivers in a single chassis for the reception of two dis-
crete monophonic signals or a stereo signal. It also provides an
option for output mixing, which combines the received signals from
both inputs into a single monophonic output—critical when using
audio mixers with limited numbers of channels.
•All components utilize an automatic tone squelch feature that
prevents the reception of unwanted signals.
•The UT-5 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 and headset mics 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-5 hand-held microphone transmitter features an all-brass
housing painted with a durable epoxy base. 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 SM87 Condenser
Shure SM85 Condenser
•Both the UT-5 and UH-5 transmitters provide “popless”muting,
which turns off the audio signal while leaving the carrier signal on.
•All components have rugged construction that ensures reliable
operation in even the most demanding performance environments.
4

Guided Tour - UR-5/UR-5D
Front Panel
1: Power switch - Use this to turn the main power on and off. When
the receiver is on, the display section (see #5 on the next page) is lit.
2: Antenna A and B mountings - Connect the supplied antennas to
these mountings. Third-party receiver antennas should not be substitut-
ed—use only the antennas provided with your receiver.
3: Group knob - Allows you to select any of ten frequency Groups
(numbered from 0 - 9). When using the Samson UHF Synth System in a
multiuser environment (that is, when there are two or more transmitters
and receivers in use at one location), all receivers must be set to the
same Group in order to avoid intermodulation distortion. Each individual
performer is then assigned an individual Channel within that Group
(up to eleven channels are available simultaneously*).
4: Channel knob - Allows you to select any of ten frequency Channels
(numbered 0 - 9) within the selected Group.* When a new channel is
selected, it takes approximately five seconds for audio signal to be
passed through to the receiver outputs.
* Only group 9 has more than seven available channels; all other groups
use channels 0 - 6. Refer to the UHF Frequency Chart on page 24 for
more details. 5
SAMSON
UHF SYNTHESIZED DIVERSITY RECEIVER
ANTENNA - A
UHFSynth Series
5
4
3
210
67
8
9
UR-5
UR-5
GROUP 5
4
3
2
10
678
9
10
AF LEVEL
5
3
21
6
7
8
9
CHANNEL
0
ANTENNA - B
POWER
AVAILABLE / MUTE
12345
12345
AB
RF LEVEL
AF LEVEL
dbx
NOISE
REDUCTION
1
23452
6
12345
AB
RF LEVEL
AF LEVEL
5a
AVAILABLE / MUTE
12345
5b 5d 5e 5c

Guided Tour - UR-5/UR-5D
Front Panel
5: Display section - Shows you information about the current status of
your receiver.
5a: “A”/“B” LEDs - When signal is being received, one of these LEDs
(which shows you whether the “A”or “B”channel is currently being
used) will be lit. A computer chip inside the receiver 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 virtually eliminating
potential interference and phase cancellation problems.
5b: “Available”LED - When lit, the selected Group and Channel (as
determined by the Group and Channel knobs) is available for use.
When off, the selected Group and Channel is unavailable and cannot be
used. See the reference chart on page 24 for more information.
5c: “Mute”LED - Lights to indicate the absence of carrier signal. As
described on page 20 of this manual, setting the UT-5 or UH-5 Audio
switch to the “on”position operates a tone squelch feature by causing
a 38.4 kHz signal to be added to the carrier. The illuminated word
“MUTE”in the UR-5 and UR-5D display is a visual representation of the
absence of this 38.4 kHz signal. When “MUTE”is lit, either the transmit-
ter Audio switch is in the “off”position or the currently selected Group
and Channel do not match that of the transmitter.
5d: RF (Radio Frequency) Level display - This “ladder”display (simi-
lar to the VU bar meter used on audio devices) indicates the strength of
the UHF signal being received. When all five segments are lit, the
incoming signal is at maximum strength; when only the left-most seg-
ment 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
and receiver are set to the same Group and Channel (see the “Trouble-
shooting”section on page 21 for more details).
6

Guided Tour - UR-5/UR-5D
Front Panel
5e: AF (Audio Frequency) Level display - This “ladder”display (simi-
lar to the VU bar meter used on audio devices) indicates the presence of
audio signal. When all five segments are lit, the outgoing signal is at
maximum strength; when only the left-most segment is lit, the outgoing
signal is at minimum strength. If no segments are lit, little or no signal is
being output; see the “Trouble-shooting”section on page 21 for more
details.
6: AF (Audio Frequency) Level - This knob determines the level of the
audio signal being output through both the balanced and unbalanced
output jacks on the rear panel.
NOTE: The UR-5D front panel (as shown below) is identical to that of the
UR-5 except that it provides two display sections and two group, chan-
nel, and AF level knobs—one for each of its two True Diversity receivers.
7
SAMSON
DUAL UHF SYNTHESIZED
DIVERSITY RECEIVER
ANTENNA - A
UHFSynth Series
5
4
3
210
67
8
9
UR-5DUR-5D
GROUP 5
4
3
2
10
678
9
10
AF LEVEL
5
4
3
21
6
7
8
9
CHANNEL
0
ANTENNA - B
POWER
AVAILABLE / MUTE
12345
12345
AB
RF LEVEL
AF LEVEL
dbx
NOISE
REDUCTION
5
4
3
210
67
8
9
5
4
3
2
10
678
9
10
AF LEVEL
5
4
3
21
6
7
8
9
CHANNEL
0
AVAILABLE / MUTE
12345
12345
AB
RF LEVEL
AF LEVEL
GROUP
1
23452
6345
5a
5b 5d 5e 5c
6
AVAILABLE / MUTE
12345
12345
AB
RF LEVEL
AF LEVEL
5a
5b 5d 5e 5c

8
Guided Tour - UR-5/UR-5D
Rear Panel
1: AC input - Connect the supplied standard 3-pin “EEC”plug here.
The UR-5 and UR-5D both contain automatic current and voltage
sensing circuitry and so can accept any mains current from 100 - 250
volts without the need to set a selector switch.
2: Balanced output* - Use this electronically balanced low impedance
(600 Ohm) XLR jack when connecting the UR-5 or UR-5D to profession-
al (+4) audio equipment. Pin wiring is as follows:
* If required, both the balanced and unbalanced outputs can be used
simultaneously.
SAMSON
SAMSON TECHNOLOGIES CORP.
HICKSVILLE, NEW YORK, U.S.A.
UHF SYNTHESIZED DIVERSITY RECEIVER 120V~ 50 / 60Hz 11W
POWER
RATING
UNBALANCED
OUTPUT
-10dBv.5KΩ
MODEL No.UR-5 AC INPUT
(120V-240V VOLTAGE SENSING)
BALANCED
OUTPUT
-10dBm.600Ω
1235
5
3 - SIGNAL
2 + SIGNAL
1 GROUND +

9
Guided Tour - UR-5/UR-5D
Rear Panel
3: Unbalanced output* - Use this unbalanced high impedance (5K
Ohm) 1/4”jack when connecting the UR-5 or UR-5D to consumer (-10)
audio equipment. Wiring is as follows:
4: Output Mixing switch (UR-5D receiver only) - When on, the outputs
from both receivers are mixed together equally into a single monophonic
signal which appears at both sets of balanced and unbalanced outputs.
5: 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
SAMSON
SAMSON TECHNOLOGIES CORP.
HICKSVILLE, NEW YORK, U.S.A.
UHF SYNTHESIZED DIVERSITY RECEIVER 120V~ 50 / 60Hz 17W
POWER
RATING
UNBALANCED
OUTPUT
-10dBv.5KΩ
MODEL No.UR-5D AC INPUT
(120V-240V VOLTAGE SENSING)
BALANCED
OUTPUT
-10dBm.600Ω
UNBALANCED
OUTPUT
-10dBv.5KΩ
BALANCED
OUTPUT
-10dBm.600Ω
RECEIVER 2 RECEIVER 1
OUTPUT MIXING
ON OFF
1235
523 4

10
Guided Tour - UT-5
INPUT
UT-5
SAMSON
Beltpack Transmitter
SAMSON
MIN MAX
MIN MAX
INST LEVEL
INPUT
0
1
2
3
4567
8
9
0
1
2
3
567
8
9
4
0
1
2
3
567
8
9
4
0
1
2
3
567
8
9
4
INST
MIC
UNAVAILABLE
MIC LEVEL
CHANNELGROUP
BATT AUDIO ANT
OFF ON
2 3 4 5
INPUT
POWER OFF
ON
1
5
8
6
710
11
9
12

11
Guided Tour - UT-5
1: Power on-off switch* - Use this to turn the UT-5 on or off (to
conserve battery power, be sure to leave it off when not in use).
2: Six-pin input connector - Connect your input device (lavalier mic,
headset mic or instrument cable) here, using the supplied six-pin
connector. A wiring diagram and chart (showing connections for many
popular lavalier and headset mics) is presented on pages 25 - 27.
3: Battery LED - This LED is an indicator of battery strength. If the
battery is sufficiently strong, when the UT-5 is first powered on, this LED
will light for about two-tenths of a second and then go off.** When bat-
tery voltage is low, this LED lights steadily, indicating that the battery
needs to be replaced.
4: Audio on-off switch - When set to the “on”position, audio signal is
transmitted. When set to the “off”position, the audio signal is muted.
Because the carrier signal remains during muting, no “pop”or “thud”will
be heard. Note that turning this off does not turn off the transmitter
power—it is simply a way to temporarily mute the transmission of audio
signal. If you don’t plan on using the transmitter for extended periods,
turn off the transmitter power by using the power on-off switch (see #1
above). As described on page 20 of this manual, setting the UT-5 Audio
switch to the “on”position operates a tone squelch feature by causing
a 38.4 kHz signal to be added to the carrier. The illuminated word
“MUTE”in the UR-5 and UR-5D display is a visual representation of the
absence of this 38.4 kHz signal. When “MUTE”is lit, either the transmit-
ter Audio switch is in the “off”position or the currently selected Group
and Channel do not match that of the transmitter.
5: Antenna - Connect the supplied transmitter antenna to this mount-
ing. Replacement antennas are available from Samson Technologies if
required.
* Be sure to mute the audio signal at your external mixer or amplifier
before turning transmitter power on or off, or an audible pop may result.
** However, if you turn on the UT-5 within five seconds of turning it off,
the Battery LED will not light. We recommend that you always leave at
least five seconds between turning off and turning on the UT-5.

12
Guided Tour - UT-5
6: Group selector - Use the supplied plastic screwdriver to set this to
the desired Group (this must match the Group setting of the receiver—
see the “Setting Up and Using the UHF Synth System”section on page
16 for more information).
7: Channel selector - Use the supplied plastic screwdriver to set this to
the desired Channel (this must match the Channel setting of the receiv-
er—see the “Setting Up and Using the UHF Synth System”section on
page 16 for more information).
8: Mic level control (trimpot) - If you are using the UT-5 with a lavalier
or headset microphone, use the supplied plastic screwdriver to set this
input sensitivity control to the optimum level. See the “Setting Up and
Using the UHF Synth System”section on page 16 for more information.
9: Input switch - Set this to either the “INST”position (if you are using
the UT-5 with an instrument such as an electric guitar or bass) or to the
“MIC”position (if you are using it with a lavalier or headset microphone).
10: Unavailable LED - This LED lights when the selected transmitter
Group and Channel (as determined by the Group and Channel controls)
is unavailable (see the reference chart on page 24). If this lights, it is an
indication that you must choose a different Group and/or Channel for
both the UT-5 and the receiver. NOTE: It takes approximately two
seconds for this to light if an unavailable channel is selected.
11: Instrument level control (trimpot) - If you are using the UT-5 with
an instrument such as an electric guitar or bass, use the supplied plastic
screwdriver to set this input sensitivity control to the optimum level.
See the “Setting Up and Using the UHF Synth System”section on page
16 for more information.
12: Battery holder - Insert a standard 9-volt alkaline battery here, being
sure to observe the plus and minus polarity markings shown.
13: Plastic screwdriver - Specially designed for use in setting the
Group and Channel selectors (see #6 and #7 above) and for adjusting
the Mic and Instrument level trimpots (see #8 and #11 above). See the
“Setting Up and Using the UHF Synth System”section on page 16 for
more information.

Guided Tour - UH-5
13
SAMSON
PULL
TO
OPEN
+
-
0
1
2 3
567
8
9
4
0
1
2 3
567
8
9
4
GROUP CHANNEL
UNAVAILABLE
POWER MIC
LEVEL
MIN MAX
ON
OFF
dbx
NR
AUDIO ONOFF
BATT
SAMSON
2
UHF SYNTHESIZED
WIRELESS MICROPHONE UH-5
FCC ID CCRUH-5
MADE IN JAPAN
6
3
1
5
4
3
1
7
8

14
Guided Tour - UH-5
1: Power on-off switch* - Use this to turn the UH-5 on or off (to
conserve battery power, be sure to leave it off when not in use).
2: Mic level control (trimpot) - Use the supplied plastic screwdriver to
set this to the optimum microphone output level. See the “Setting Up
and Using the UHF Synth System”section on page 16 for more
information.
3: Battery holder - Insert a standard 9-volt alkaline battery here, being
sure to observe the plus and minus polarity markings shown.
4: Group selector - Use the supplied plastic screwdriver to set this to
the desired Group (this must match the Group setting of the receiver—
see the “Setting Up and Using the UHF Synth System”section on page
16 for more information).
5: Channel selector - Use the supplied plastic screwdriver to set this
to the desired Channel (this must match the Channel setting of the
receiver—see the “Setting Up and Using the UHF Synth System”
section on page 16 for more information).
6: Unavailable LED - This LED lights when the selected transmitter
Group and Channel (as determined by the Group and Channel controls)
is unavailable (see the reference chart on page 24). If this lights, it is an
indication that you must choose a different Group and/or Channel for
both the UH-5 and the receiver. NOTE: It takes approximately two
seconds for this to light if an unavailable channel is selected.
* Be sure to mute the audio signal at your external mixer or amplifier
before turning transmitter power on or off, or an audible pop may result.

15
7: Audio off-on switch - When set to the “on”position, audio signal is
transmitted. When set to the “off”position, the audio signal is muted.
Because the carrier signal remains during muting, no “pop”or “thud”will
be heard. Note that turning this off does not turn off the transmitter
power—it is simply a way to temporarily mute the transmission of audio
signal. If you don’t plan on using the transmitter for extended periods,
turn off the transmitter power by using the power on-off switch (see #1 on
the previous page). As described on page 20 of this manual, setting the
UT-5 Audio switch to the “on”position operates a tone squelch feature
by causing a 38.4 kHz signal to be added to the carrier. The illuminated
word “MUTE”in the UR-5 and UR-5D display is a visual representation
of the absence of this 38.4 kHz signal. When “MUTE”is lit, either the
transmitter Audio switch is in the “off”position or the currently selected
Group and Channel do not match that of the transmitter.
8: Battery LED - This LED is an indicator of battery strength. If the bat-
tery is sufficiently strong, when the UH-5 is first powered on, this LED will
light for about two-tenths of a second and then go off.* When battery
voltage is low, this LED lights steadily, indicating that the battery needs
to be replaced.
* However, if you turn on the UH-5 within five seconds of turning it off,
the Battery LED will not light. We recommend that you always leave at
least five seconds between turning off and turning on the UH-5.
Guided Tour - UH-5

The general procedure for setting up and using your UHF Synth System
is basically the same regardless of the particular components you are
using (i.e. UT-5 or UH-5; UR-5 or UR-5D):
1. Remove all packing materials (save them in case of need for future
service) and mount the supplied “A”and “B”antennas to your receiver
by inserting the BNC connector and twisting clockwise until snug.
1a. If you are using the UT-5 beltpack transmitter, connect its antenna
by inserting the wire and turning it clockwise until snug and then make
the physical connection between its 6-pin plug and the lavalier micro-
phone, headset microphone or instrument cable you are using (be sure
to correctly set the “Mic/Instrument”switch). Because the 6-pin
plug is “keyed,”you’ll need to rotate it a certain way to get it to “mate”
with the connector mounted on the UT-5; then push straight down until
you hear a click. To remove the 6-pin connector, lift up the outer sleeve
and pull straight out (do not use force!). We recommend that you never
pull on the wire, only the plug itself (with the outer sleeve lifted). If you
are using a lavalier microphone, correct placement is critical to sound
quality. We recommend that you place it as shown in the illustration
above—as close to your mouth as possible but off to one side (to
minimize nasality) and unobstructed by clothing. Bear in mind also that
omni-directional microphones (mics which pick up signal from all direc-
16
OPEN
OPEN
OPEN
INPUT
UT-5
SAMSON
Beltpack Transmitter
UHFSynth Series
Setting Up and Using the
UHF Synth System

17
Setting Up and Using the
UHF Synth System
tions) are more prone to feedback problems than unidirectional (cardioid
or supercardioid) ones; in general, you can avoid feedback by taking
care not to use any microphone directly in front of a PA speaker (if this
is unavoidable, you can try using an equalizer to attenuate those high
frequencies which are causing the feedback “squealing”).
2. Place a fresh 9-volt alkaline battery (not supplied) into your UT-5 or
UH-5 transmitter, taking care to observe the polarity markings. We
recommend the Duracell MN 1604 type or equivalent. We do not
recommend the use of rechargeable Ni-Cad batteries because they do
not supply adequate current for any significant time period. For the
moment, leave the transmitter turned off.
3. Make the physical cable connections between the output of your
UR-5 or UR-5D receiver (using either the balanced or unbalanced
jacks)* and the input of your amplifier or mixer. If you are using
professional (+4) equipment, the balanced jack is preferable since it will
deliver an electromagnetically cleaner signal. Leave the amplifier
(and/or mixer) off at this time.
4. Connect the supplied 3-pin “EEC”plug into the UR-5 or UR-5D rear
panel AC connector and plug the other end into any grounded AC
socket.
5. Turn the AF Level knob on the UR-5 receiver (or both AF Level
knobs on the UR-5D receiver) completely counterclockwise (to the “0”
position) and depress the power switch to turn the unit on. The display
section will light up.
6. Before utilizing the UR-5 or UR-5D Group and Channel knobs to
select a frequency, determine how many transmitters and receivers you
will be using in one location. As shown in the chart on page 24, Groups
0 through 8 provide seven available Channels each (0 through 6), while
Group 9 provides eleven available Channels (0 through 9, plus Group 7,
Channel 5). When two or more transmitters and receivers are being
* If required, both the balanced and unbalanced outputs can be used
simultaneously.

18
Setting Up and Using the
UHF Synth System
used at the same location, all devices must be set to the same Group
(though each will use its own Channel) or intermodulation noise may
occur. If you are using the UR-5D receiver for the reception of a stereo
signal (or for the reception of two simultaneous monophonic signals),
both sides (Receiver 1 and Receiver 2) must be set to the same Group.
If you are only using a single transmitter and receiver, you can select any
Group and available Channel with a sufficiently strong signal (see #6
below). Start with Group 0 and scan through all available Channels
while observing the RF Level display in the receiver. If any segments
glow with the transmitter off, the selected Channel may be receiving
interference and is probably unsuitable for use (one segment glowing is
insignificant). Select a Group that has the greatest number of suitable
Channels (that is, Channels where no segments light or glow with the
transmitter off).* When you have decided which Group and Channel
you wish to utilize, use the supplied plastic screwdriver to set the same
Group and Channel on the appropriate UT-5 or UH-5 transmitter.
7. Turn on the power to the UT-5 or UH-5 transmitter (using its Power
on-off switch) and observe the RF Level display in the UR-5 or UR-5D
receiver; all segments should light up. When first setting up the UHF
Synth System in a new environment, it’s always a good idea to do a
walkaround while experimenting with different Group and Channel
settings—you may find that some cause more RF Level segments to
light up than others (the more segments light, the stronger the signal).
Always pick the Group that has the greatest number of clear Channels
and the Channel providing the strongest signal. Note that whenever a
new channel is selected, it takes approximately five seconds for audio
signal to be passed through to the receiver outputs.
8. Once you’ve settled on your Group and Channel assignments, it’s
time to set the audio levels. If you are using the UH-5 transmitter or the
UT-5 transmitter with a connected lavalier or headset microphone, speak
or sing into the mic at a normal performance level while slowly raising
the equivalent AF Level knob on the receiver to a level of approximately
“8.”. Observe the receiver’s AF level display as you do so; one or more
* If your installation requires more than seven simultaneous Channels,
you’ll have to use Group 9.