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. Pacific S treet San Marcos, CA 920 78 (770) 614-7443
www.diamondantenna.net
