Diamond Antenna F23A User manual

Description
1. Three piece joint FRP element
structure employing newly
developed direct joint system
enables the antenna to:
(A) Achieve enough strength to
compete with one piece
structure element by
overlapping upper and lower
FRP element directly.
(B) Obtain perfect waterproof
structure at the element joint
section by using ring gasket.
(C) Assemble or disassemble if
necessary by simply fastening
or loosening of few connec-
tion points.
2. Unstable vswr caused by weather
conditions is eliminated by perfect
waterproof structure. In addition,
anti-corrosion and rust free
structure of the antenna enables it
to be used at seaside or
contaminated industrial areas
without any precautions.
3. DC ground structure of the antenna
protects the radio equipment from
high voltage caused by thunder
lightening.
4. Element length and the parameter
of the phase inductor are
determined by our years of
experience and experiments to
have maximum high performance.
5. C-LOAD structure employed at
the upper element improves the
propagation efficiency of the
antenna better than conventional
two-element vertical antenna.
Specifications
FREQUENCY: 144-148 MHz
GAIN: 7.8 dB
POWER: 200 Watts
IMPEDANCE: 50 Ohms
VSWR: less than 1.5:1
MAX WIND
RESISTANCE: 40m/sec (112 MPH)
MAST DIAMETER
ACCEPTED: 30-62mm
(1-1/5” to 2-2/5”)
LENGTH: 4.53m (178.3”)
WEIGHT: 1.6 kg (3.5 lbs.)
CONNECTOR: UHF Female
WARRANTY: 1 Year against
defects in material
or workmanship.
Adjustment
The F23A is completely adjustment
free. If vswr of the antenna is
extremely high. It is most likely due
to trouble in a contact point some-
where. Be sure to see if those contact
points are firmly fastened or correctly
soldered. And coaxial cable connected
to the antenna has to be those of
50ohm impedance.
Note: Though the F23A employs DC
ground structure, circuit across the
center conductor and ground section
is open circuited it is measured by
volt-ohm meter. If it is close circuited,
be sure to see coaxial cable and con-
nector section carefully.
F23A
         
        
       

2m 5/8 Wave Three-Element High performance FRP Shell Gain Vertical Antenna
DIAMOND ANTENNA Products are distributed by RF PARTS COMPANY
435 S. Pacic S treet San Marcos, CA 920 78 [phone]
www.diamondantenna.net

Assembly
To begin with, put middle element out
about 10cm (3.9”) from middle
element FRP shell and put upper
element out about 10cm (3.9”) from upper
element FRP shell.
1. Connect upper element and middle ele-
ment by securing set screws firmly.
2. Put upper FRP element shell into lower
FRP element shell until it reaches the
gasket and fasten them with joint bracket.
3. Connect middle element and lower
element by securing set screws firmly.
4. Put middle element shell into lower
element shell until it reaches the gasket
and fix them with joint element shell
joint brackets.
5. Fasten each connecting section firmly to
have no gap between each shell with
wrench.
6. Attach three radial elements as shown
in Fig. A.
7. Attach mast brackets to support pipe by
securing set screws. Connect a coaxial
cable to the feedpoint section through
support pipe. Then, attach support pipe
to the bottom of the antenna with set
screw by aligning the holes at the bot-
tom of the feedpoint section and the
upper part of support pipe.
8. Attach the antenna to mast as shown in
Fig. A by taking the entire balance in
account.
For Your Safety
Please read the following safety
precautions before antenna assembly.
• Assemble the antenna on the ground or
wide and flat place such as on balcony
before installation.
• Do not assemble or install the antenna on a
place where you can not have enough dis-
tance from any electric power lines.
• Do not install the antenna on a rainy or
windy day.
• Do not attempt to install the antenna only by yourself.
Installing the antenna alone on the roof may lead you to
a dangerous accident. Always ask your friends or a
professional for help installing the antenna.
• Do not use iron or aluminum ladder at a reachable
distance from any electric power lines.
• Do not install the antenna on a mast which is not
grounded properly.
• Do not have your family members or friends touch or
come close to the antenna, unless they have realized its
potential danger.
TO AVOID FATAL ACCIDENT
• Do not attempt to sustain the antenna, or any part of
support structure if it begins to fall down. Let it fall by itself.
• Do not attempt to remove or restore the antenna or any
part of support structure if it touches an electric power
line. Let it be as it is, do not touch it, and call your local
electric power company immediately.
IN CASE OFAN ACCIDENT
• Do not touch a person or an animal who is or seems to
be in contact with the antenna or any support structure
which is fallen on a live electric power line. Touching
one may lead you to be electrocuted.
• Do not attempt to separate a person or an animal who is
or seems to be in contact with the antenna or any support
structure which is fallen on a live electric power line by
yourself. Call or have someone call a police officer,
ambulance, or doctor immediately.
Antenna Installation Precautions
To determine antenna installation location, there are
several factors to be taken into account. First thing is
antenna propagation direction to specific target stations.
As to whether there are any obstacles such as tall
buildings on the line of sight. Next is specific installation
location. As to whether specific location is adequate in
terms of antenna support and surrounding safety.
• Do not attempt to install the antenna by yourself if you
do not have any experience in installing base station
antenna. Ask your experienced friends or a professional
for help.
• Do not attempt to install the antenna at a location where
it does not have enough distance from nearby electric
power lines. It is advised to install the antenna at least
twice of total antenna height from nearby electric
power lines.
• Do not install the antenna on any type of tower, pole or
telescopic mast which exceeds 30 feet high, if you do
not have enough experience in installing the antenna on
that kind of location. Ask your experienced friends or a
professional for help.
• Do not use more than 1/10’ section if you install the
antenna on iron plumber’s pipe. Attach guy wire if mul-
tiple pipes are used to install the antenna.