General Technical Description ..............................................................................................................................................................4
RF/Power Distribution Module Block Diagram ......................................................................................................................................4
Power Supply ........................................................................................................................................................................................5
Assembly and Installation .....................................................................................................................................................................6
Installing the Receivers .........................................................................................................................................................................6
Installing the Wire Cover .......................................................................................................................................................................7
Installing the Assembled Unit ................................................................................................................................................................7
Antenna Types and Bandwidth ..............................................................................................................................................................8
Antenna Use and Placement .................................................................................................................................................................9
Service and Repair ...............................................................................................................................................................................11
Returning Units for Repair ..................................................................................................................................................................11
Rio Rancho, NM3
UMCWB
RF FILTERING & DISTRIBUTION
POWER SUPPLY & DISTRIBUTION
Polyfuses
RF
Amp
Splitter
&
Isolator
RF to
Receivers
12V DC
Power to
Receivers
RF
Amp
Diversity RF/Power Distribution Module
11-18 VDC
>2 Amps
A
Antenna
B
Antenna
Ceramic Filters
Main
Polyfuse
Splitter
&
Isolator
General Technical Description
The purpose of wideband architecture is to provide
the flexibility needed to deal with a changing RF environment, and for mobile productions that cover broad
geographic areas. The UMCWB provides a mechanical
rack mount with power and RF signal distribution for
four diversity compact receivers in a single rack space.
The standard version covers frequency blocks from 21
through 29. The wideband low version covers frequency
blocks from 470 through 26.
The RF multicoupler preserves the sensitivity and
overload performance of the finest receivers. Selective
filtering in the front end attenuates RF signals above
and below the passband to suppress intermodulation
and noise. Following the filters is a low noise RF amplifier with gain matched to compensate for the losses in
the splitter that follows.
RF/Power Distribution Module Block Diagram
A precision strip line splitter/isolator divides the RF
signal into four isolated signals preventing spurious
RF coupling between receivers. The splitter/isolator is
termination independent which prevents mismatched
or disconnected RF outputs from affecting the other
receivers.
The assembly is powered from an external source of
11 to 18 VDC with individual auto-reset fuses for each
receiver in the RF/power distribution module. This architecture eliminates ground loops and AC hum that can
occur when the receiver outputs are connected to other
audio equipment operating from a different AC source.
LECTROSONICS, INC.4
Antenna Input
Center pin (+)
Pin diameter .075” (1.8 mm)
Standard 50 ohm BNC connectors are used for the antenna inputs and signal distribution. The RF signals are
fed to the receivers via coaxial cables that loop through
the front panel to the receiver inputs. The leads are
labeled as “A” and “B” and routed so that each receiver
has one of each connected for diversity reception.
“B” leads
U-Channel Wire Cover
UHF Diversity Multicoupler
“A” leads
Antenna Inputs
12VDC IN
Power Supply
The multi-coupler is powered by external 12 VDC (11 to
18 VDC is acceptable). The center pin of the input jack
is positive. The power supply must be capable of handling up to 2 amps of current. DC power is distributed to
the receivers via rear panel pigtail connectors.
Serial Number
and Frequency
12VDC Receiver Power Plugs
The Lectrosonics PS70 is a switching power supply with
coaxial connector matched to the 12VDC power jack
on the multicoupler. The AC receptacle is a standard,
grounded IEC 60320 C14 inlet socket that will accept
common cords like those used on computer equipment
(AC cord is not included). Output cable is 6 ft. long.
Rio Rancho, NM5
UMCWB
Assembly and Installation
Assembly of the unit consists of installing the receivers in the frame and connecting the antenna leads and
power cables to each receiver.
“B” Antenna Leads
Power Supply Leads
“A” Antenna Leads
3. Route the antenna leads through the slots on the
front of the frame before mounting the receivers.
Start with the shortest “A” lead and the shortest “B”
lead for the receiver closest to the power supply,
then the next shortest A and B leads for the next receiver, and so forth. Each diversity receiver must be
connected to an “A” lead and a “B” lead for diversity
reception.
Installing the Receivers
1. Remove the U-channel wire cover by completely removing the four counter-sunk phillips head screws
from the top of the unit. Underneath the U-channel
wire cover is a rectangular metal bar held down
by five counter-sunk phillips head screws. Loosen
these five screws five to seven turns (it’s not necessary to remove them completely.)
Note: Before installing the receivers, be sure to
record the serial numbers and frequencies. This
information is printed on the side panel labels
which won’t be visible after installation.
2. Route the three longest “B” antenna leads behind
the post nearest the housing as shown here. Remove the screw from the post next to the housing if
necessary to route the longer “B” leads. The shortest “B” lead should be routed along the housing
directly to the front panel.
Three longest “B” leads
“A” leads
Shortest “A” lead
Shortest “B” lead
4. Insert the first receiver into the slot nearest to the
power switch by sliding it under the wiring harness
and the rectangular metal bar. Be sure the front
panel of the receiver is fully inserted into the cutout
on the inside of the front panel. Install the remaining
receivers in the same manner.
Power cables
Cable routing prior to assembly
5. Secure the receivers into the frame by tightening
the five counter-sunk phillips head screws in the
rectangular metal rod. Don’t overtighten!
Shortest “B” lead
With each receiver, route the
“B” antenna cable under the
bar and place it in the gap
next to the screw.
LECTROSONICS, INC.6
UHF Diversity Multicoupler
6. The power cables can be routed outside of the Uchannel cover, or routed under the U-channel cover
alongside the antenna leads.
Note: If you opt to run the power cords outside of
the U-channel along the back of the receivers, they
might be unplugged accidentally.
Installing the Wire Cover
Installing the U-channel wire cover can be difficult if the
power cables are routed with the antenna leads under
the U-channel wire cover. The cables must lay flat and
straight, and not overlap to allow the wire cover to lay
flush with the rack mount. The technique described here
is the easiest way to install the U-channel wire cover,
A) Dress the antenna and power cables so that the
bundle is as flat as possible. Make sure no wires
are on top of the metal bar.
B) Starting at the end opposite the power supply, care-
fully place the U-channel wire cover over the wiring
bundle and press down.
C) While keeping downward pressure on the U-chan-
nel, slide it to the left over the wire bundle.
D) As you move the U-channel across the bundle,
dress the cables with your other hand to make sure
the wires remain as flat and neatly aligned as possible. The power cords in particular need to lie flat
and not overlap each other.
E) While holding the U-channel down, insert the four
phillips head screws and tighten them slowly while
watching the wires to make sure none are pinched.
A:
B:
C:
D:
E:
Installing the Assembled Unit
Mount the assembled frame into the rack, connect the
antenna and an appropriate power supply. There are no
special ventilation requirements.
Rio Rancho, NM7
UMCWB
Antenna Types and Bandwidth
While the wide bandwidth of the multi-coupler is very
convenient, it also requires that the antennas used
with it also have a bandwidth wide enough to cover the
range of the receivers that are installed. If the entire
bandwidth from block 21 through block 29 is to be used,
the best antenna would be one of the ALP Series log
periodic models.
ALP620 Log-periodic antenna
The ALP Series antennas are ideal for use with wideband multicouplers, offering a directional coverage pattern and a gain of 4.5 dBd. Three different models are
available to suit your specific needs.
Whip antennas can only be used if the frequency block
of the antennas is the same as the installed receivers,
or one block higher or lower. For example, block 24, 25
and 26 receivers can be used with block 25 antennas.
The SNA600 dipole antenna folds for storage
To achieve wideband, circular coverage, two SNA600
antennas tuned to different frequency ranges can be
used with an external combiner, however, loss could
occur depending upon how they are positioned and how
much overlap exists in their tuning ranges.
To reduce the interaction between two SNA600 antennas, mount them in a vertical orientation, about a half
wavelength apart, so they will be in each other’s null.
In theory, there will be some noise generated by mixing the signal from the “out of band” antenna with the
intended one, but it is likely to be inconsequential in
actual use.
Whip antennas can be used as long as the frequency band
matches the receivers installed in the multi-coupler.
If a circular pattern is needed, the SNA600 dipole
model is an excellent choice, however, it is limited to
a 100 MHz bandwidth (about 4 blocks). It is tuned to
match the frequencies of the installed receivers by
adjusting the length of the elements according to the
scale on the body of the antenna. It is supplied with
a mounting strap, hardware and a rotatable mounting
block, and folds for storage.
2-way
combiner
Output to
multicoupler
High freq tuning range
Low freq tuning range
LECTROSONICS, INC.8
Antenna Use and Placement
DIRECT SIGNAL
INDIRECT SIGNAL
DIRECT SIGNAL
INDIRECT SIGNAL
TRANSMITTER
PHASE
CANCELLATION
REFLECTIVE SURFACE
UHF Diversity Multicoupler
Try to position the antennas so that they are not within 3
or 4 feet of large metal surfaces. It is also good to maintain a direct “line of sight” between the transmitter and
the receiver antennas. In situations where the operating
range is less than about 50 feet, the antenna positioning is much less critical.
A wireless transmitter sends a radio signal out in all
directions. This signal will often bounce off nearby walls,
ceilings, metal surfaces, etc. and a strong reflection can
arrive at the receiver antenna along with the direct signal. If the direct and reflected signals are out of phase
with each other a cancellation will occur as the signals
mix at the antenna input. The result will be a “drop-out.”
A drop-out usually sounds like a brief noise burst, click,
pop, or something similar. In severe cases, it may result
in a complete loss of the carrier and the sound. A dropout situation may be either better or worse as a crowd
fills and/or leaves the room, or when the transmitter and
receiver antennas are moved to different locations.
Diversity receiver designs include a method of selecting or combining two antennas to reduce or eliminate
drop-outs. The antennas must be placed at least a half
wavelength apart to achieve a noticeable reduction in
drop-outs, or better yet, several feet apart.
It is generally best to use two of the same type antennas on a diversity receiver, as some designs combine
both antenna signals into a single receiver with a phase
correction between them to maximize the resultant RF
signal. If one antenna signal is significantly stronger
than the other, the signal from the weaker antenna will
do little to prevent multipath drop-outs that occur at the
stronger antenna.
The diagram below depicts a classic multipath drop-out
situation. In some diversity designs, a second antenna
in a different location is selected instead of the first antenna, following the logic that a multipath drop-out is not
likely to occur simultaneously at both antennas. Other
designs combine the two antenna signals and control
the phase of one them to make sure they always add to
each to provide a stronger signal.
Rio Rancho, NM9
UMCWB
Accessories
ARG2 RF coaxial cable assembly, 2ft length,
BNC male connectors
ARG15 RF coaxial cable assembly, 15 ft. length,
BNC male connectors
ARG25RF coaxial cable assembly, 25 ft. length,
BNC male connectors
ARG50RF coaxial cable assembly, 50 ft. length,
BNC male connectors
ARG100RF coaxial cable assembly, 100 ft.
length, BNC male connectors
ALP500Log periodic dipole array (“shark fin”)
antenna; standard version
ALP620Log periodic dipole array (“shark fin”)
antenna; “skeletal” body reduces wind
loading in outdoor use
ALP650Log periodic dipole array (“shark fin”)
antenna; built-in RF amplifier with
adjustable gain
SNA600Tunable dipole antenna; 100 MHz
bandwidth
PF25 Passive inline filter; 30 MHz bandwidth;
BNC to BNC connectors; bidirectional
PF50 Passive inline filter with bias-T; 50 MHz
bandwidth; BNC to BNC connectors
PS70Power supply; 100-240 VAC; 13.8 VDC,
2.8 A output
Specifications
RF Gain: 0.5 to 1.5dB
Bandwidth:
UMCWB: 537 to 768 MHz.
UMCWBL: 470 to 692 MHz
RF Outputs: Eight outputs, 50 Ohm, BNC
Isolation between outputs: 25 dB or greater
Any output can be open, shorted
or terminated without affecting other outputs.
Splitter type: Wilkinson 1/4 wave
Filtering: Two pole ceramic filter per antenna
Noise figure: 3.5dB
Third Order Intercept: +27 dBm (input or output)
Power Input: +11 to +18V DC;
Power Consumption: 2 amps max.
Antenna Connectors: 50 ohm BNC
Short Circuit Protection: Auto-reset thermal fuses
Construction: Machined aluminum panels and
housings.
Dimensions: 19” wide, 1.75” high, 6.5” deep
Weight: 5 lbs. (typical) including 4 receivers
Specifications subject to change without notice.
This product meets the CE Compliance Standards - EN55022 and EN50082-1:1998. A copy of the Declaration of
Conformity may be requested from your dealer or by contacting the factory directly:
Lectrosonics, Inc.
Marketing Department
581 Laser Rd. NE, Rio Rancho, NM 87124 USA
tel: 505-892-4501 fax: 505-892-6243
e-mail: marketing@lectrosonics.com
LECTROSONICS, INC.10
UHF Diversity Multicoupler
Service and Repair
If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment
needs repair. Make sure you have followed the setup procedure and operating instructions. Check the interconnecting cables and then go through the Troubleshooting section in this manual.
We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop
attempt anything other than the simplest repair. If the repair is more complicated than a broken wire or loose connection, send the unit to the factory for repair and service. Don’t attempt to adjust any controls inside the units. Once
set at the factory, the various controls and trimmers do not drift with age or vibration and never require readjustment.
There are no adjustments inside that will make a malfunctioning unit start working.
LECTROSONICS’ Service Department is equipped and staffed to quickly repair your equipment. In warranty repairs
are made at no charge in accordance with the terms of the warranty. Out-of-warranty repairs are charged at a modest
flat rate plus parts and shipping. Since it takes almost as much time and effort to determine what is wrong as it does
to make the repair, there is a charge for an exact quotation. We will be happy to quote approximate charges by phone
for out-of-warranty repairs.
Returning Units for Repair
For timely service, please follow the steps below:
A. DO NOT return equipment to the factory for repair without first contacting us by email or by phone. We need
to know the nature of the problem, the model number and the serial number of the equipment. We also need a
phone number where you can be reached 8 A.M. to 4 P.M. (U.S. Mountain Standard Time).
B. After receiving your request, we will issue you a return authorization number (R.A.). This number will help speed
your repair through our receiving and repair departments. The return authorization number must be clearly shown
on the outside of the shipping container.
C. Pack the equipment carefully and ship to us, shipping costs prepaid. If necessary, we can provide you with the
proper packing materials. UPS is usually the best way to ship the units. Heavy units should be “double-boxed” for
safe transport.
D. We also strongly recommend that you insure the equipment, since we cannot be responsible for loss of or dam-
age to equipment that you ship. Of course, we insure the equipment when we ship it back to you.
Lectrosonics USA:
Mailing address: Shipping address: Telephone:
Lectrosonics, Inc. Lectrosonics, Inc. (505) 892-4501
PO Box 15900 581 Laser Rd. (800) 821-1121 Toll-free
Rio Rancho, NM 87174 Rio Rancho, NM 87124 (505) 892-6243 Fax
USA USA
581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com
(505) 892-4501 • (800) 821-1121 • fax (505) 892-6243 • sales@lectrosonics.com
LIMITED ONE YEAR WARRANTY
The equipment is warranted for one year from date of purchase against defects in
materials or workmanship provided it was purchased from an authorized dealer. This
warranty does not cover equipment which has been abused or damaged by careless
handling or shipping. This warranty does not apply to used or demonstrator equipment.
Should any defect develop, Lectrosonics, Inc. will, at our option, repair or replace any
defective parts without charge for either parts or labor. If Lectrosonics, Inc. cannot
correct the defect in your equipment, it will be replaced at no charge with a similar new
item. Lectrosonics, Inc. will pay for the cost of returning your equipment to you.
This warranty applies only to items returned to Lectrosonics, Inc. or an authorized
dealer, shipping costs prepaid, within one year from the date of purchase.
This Limited Warranty is governed by the laws of the State of New Mexico. It states the
entire liablility of Lectrosonics Inc. and the entire remedy of the purchaser for any
breach of warranty as outlined above. NEITHER LECTROSONICS, INC. NOR
ANYONE INVOLVED IN THE PRODUCTION OR DELIVERY OF THE EQUIPMENT
SHALL BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL,
OR INCIDENTAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
THIS EQUIPMENT EVEN IF LECTROSONICS, INC. HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. IN NO EVENT SHALL THE LIABILITY OF
LECTROSONICS, INC. EXCEED THE PURCHASE PRICE OF ANY DEFECTIVE
EQUIPMENT.
This warranty gives you specific legal rights. You may have additional legal rights which
vary from state to state.
8 Jan 2009
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