Maspro U144LK2 User manual

1
MASter of PROduction
Read this instruction manual carefully before use.
ch. E21~E58
U144LK2
U204LK2
Instruction Manual
For Horizontal
Polarization
75Ω
Beam Dipole
MASPRO's original beam dipole with built-in phase
shifter provides excellent gain and VSWR over the wide
band.
Corner Reflector
MASPRO UHF antenna with corner reflector reduces
double images, and make clear pictures.
Aluminum Double Boom
Double structured aluminum boom and boom support
are light yet sturdy.
Corner
Reflector
Beam Dipole
Boom
Boom
Support
NOTE Skills and experience are required to install antennas on roofs or other elevated
locations. Make sure to consult your dealer concerning installation.
Antenna Installation Precautions
¡Be very careful to install antenna at the safest spot possible, so
that parts of the antenna will not cause injury or property damage
if they fall.
¡To prevent electric shock accidents, install the antenna as far
away as possible from wires (powerlines, high voltage wires,
telephone lines) so that it will not come into contact with the wires
even if it falls.
¡Never attempt installation on rainy or windy days. Be extremely
careful also when working under a scorching sun in summer, as
the roof can become very hot.
¡Take necessary safety measures before installing antenna, e.g.
binding the antenna, mounting brackets, and tools to prevent
them from dropping.
¡Working at elevated locations is extremely dangerous. Take all
safety measures possible before installation. When you are on the
roof, you may experience vertigo or experience an exaggerated
sense of height, your feet may become shaky and your footing
unstable. Take special care to avoid slipping.
¡Make sure to remove TV and/or Tuner AC plugs from AC wall
outlets when you connect 75Ωcoaxial cable from TV and/or Tuner.
If plugs remain in outlets, electric shock may occur.
¡Do not install the antenna and guy wire by yourself. Make sure that
someone, or preferably two or more people, are present to assist
you.
¡Reception level of the TV signals may differ depending on where
you install the TV antenna. During installation, try to adjust the
position, height and direction of the antenna for optimum reception.
¡After a typhoon or heavy snow, check the antenna, mounting
brackets, mast, roof mount, and guy wires for any signs of trouble
or loosened bolts and nuts. Replace damaged or bent antenna with
a new one. If you neglect damaged antenna or leave them without
proper maintenance, parts of the antenna and mounting brackets
may become damaged and drop, causing physical injury or
property damage.
¡Be careful not to use a rusty or corroded antenna and mounting
bracket. Weak or damaged equipment may loosen and drop,
resulting in physical injury or property damage.
UHF ANTENNA
HIGH PERFORMANCE
(For Home Use)
U144LK2
（14elements）
U204LK2
（20elements）

2
ASSEMBLY U144LK2 (Same assembling for U204LK2)
Boom Support Fixing Bracket
Corner Reflector
Beam Dipole
Cable Holder
To TV or
TV outlet
Loosen wing nut, put lead-in cable
throught the cable, and firmly tighten
the nut again.
Wing Nut
Lead-in cable
Boom
Support
Boom
Support
Put screw head in U-shaped carved
portion of fixing bracket, tighten wing-
nut firmly.
There is no screw on upper surface
of boom for positioning of fixing
bracket indicated front in drawing.
U-shape
cut portion
Boom
Support
Head of
screw
Front
Front
Front
1
Open folded corner reflector till knobby boss
of point Afits into hole of point B, then do
not open any more.
2Tighten wing nut up.
After installing beam dipole with
exposing short element to the front
direction, then tighten wing bolt up.
Wing Bolt
For Diam.
22〜32mm
Mast
(sold separately)
Use standoff
insulators sold
separately to
prevent
disconnection
Wing Nut
Long element
Short element
Check the direction of boom and elements carefully
and firmly tighten wing bolt and wing nuts.
Front
Wing Nuts
Mast
Loosen wing nuts, put the clamp
through mast, and firmly tighten the
nuts again.
Mast Fixing Clamp
Front
B
A
Wing Nut

3
HOW TO INSTALL THE CABLE
Weather boot
should be cut to fit
on cable diameter
in advance.
Cable processing
¡If possible, use 5C2V coaxial cable, or other cable which has either equaling or surpassing performance.
¡Process cable tip after getting cable through weather boot.
Connection to Beam Dipole
Fold back
braided copper
Braid
(copper braid)
Weather boot
(accessory)
Coaxial cable
(5C2V)
(Sold Separately)
Lid
4
Weather boot
(accessory)
Coaxial cable
Tuck weather boot
onto cable entrance
of beam dipole
base absolutely.
1Insert center conductor between conductor insertion
guide section and screw for fixing center conductor.
2Fix the folded outer conductor (braided copper wire) with
screw for fixing outer conductor, and tighten it at torque
value below.
3Fix the center conductor of cable with screw for fixing
center conductor at the torque below.
Retainer plate of
center conductor
Center conductor
Screw for fixing
center conductor
¡Tightening torque value
0.4N·m
(4.1kgf·cm)
Formed integral
with retainer
plate of center
conductor.
Screws for fixing
outer conductor
¡Tightening torque value
0.4N·m
(4.1kgf·cm)
Shut the lid of beam dipole with a snap after connecting cable.
13mm (Actual size) 9
Conductor insertion
guide

4
ch. E40
0˚
10˚
20˚
30˚
10˚
20˚
30˚
Beam Width
47˚
ch. E40
0˚
10˚
20˚
30˚
10˚
20˚
30˚
Beam Width
41˚
MASter of PROduction 2K56-241ML (N)･92-5241-1L
Nippon Maruchi Lanka (Pvt) Limited.
TEL : [phone]
FAX : [phone]
133, U.D.A. INDUSTRIAL ESTATE, KATUWANA ROAD,
HOMAGAMA
Specifications and external design are subject
to change for further improvements.
FEB., 2009
Agent in Sri Lanka
PERFORMANCE
VSWR (Voltage Standing Wave Ratio)
Matching Loss (gain loss)
No loss with complete matching
0.2 dB (loss)
0.5 dB (loss)
1.2 dB (loss)
All graphs are produced using MASPRO's original, fully-automatic antenna measuring device.
MASPRO's performance data is obtained with painstaking honesty and is completely reliable.
MASPRO guarantees the accuracy of its performance data.
VSWR is the degree of matching
impedance.
An antenna with a VSWR of 3 or
lower (the closer to 1, the better) is
excellent.
Weather boot × 1pc.
ACCESSORY
DIRECTIVITY
Half Power Beam Width
The narrower the beam width,
¡The less likely it is that the antenna
will genarate interference through re-
flected signals from the front.
¡The higher the actual gain produced.
Front-to-Back Ratio
U144LK2
U204LK2
Front-to-back ratio is the ratio of the
forward and backward sensitivity in dB.
The larger the front-to-back ratio, the
less likely it is that the antenna will
genarate interference through reflected
signals from the back.
VSWR
1
1.5
2
3
Reception Channels
Items
Number of Elements
Impedance
Gain
(Voltage Standing Wave Ratio)
VSWR
Front-to-Back Ratio
Adaptable Mast Diameter
ch.E21〜E58
Specification
75Ω

14 20
U144LK2 U204LK2
6〜12.7dB 6.8〜13.8dB
9〜26dB
1020（L）×380（W）×250（H）mm 1465（L）×380（W）×250（H）mm
2.8orless
22〜32mm
Dimensions
Half Power Beam Width
31〜61 û
10〜30dB
26〜56 û
57 58565554535251504948474645444342414039383736353433323130292827262524232221
774 MHz
ch.E
470
Front-to-Back Ratio
VSWR
dB
dB
16
14
12
10
8
6
4
4
3
2
1
30
25
20
15
10
5
Gain
SPECIFICATIONS
Directivity is indicated by front-to-back
ratio and beam width.
U204LK2
U204LK2
U204LK2
U144LK2
U144LK2
U144LK2
3dB
10dB
20dB
Beam Width
Half Power
3dB
10dB
20dB
Beam Width
Half Power