Procom GP-450-3-... - Manual

GP 450-3/...
Collinear, 3 dBd Ground-Plane Base Station and Marine
Antenna for the 450 MHz Band
DESCRIPTION
The high gain of this antenna combined with its low height makes it the
right choice for a wide variety of purposes.
The antenna is delivered in two models tunable by cutting within
380…410 MHz (l-version) and 406…470 MHz (h-version), respectively.
The GP 450-3/… is especially suitable as a marine antenna in connection
with 450 MHz cellular radio telephone systems making it possible to
extend the normally land-based cellular system for maritime mobile
service as well.
The compactness of the GP 450-3/… also makes it highly qualified as a
base station antenna.
The higher the antenna is mounted, the better coverage. Avoid
mounting the antenna parallel to or in the neighbourhood of other metal
parts such as masts, supporting wires etc., otherwise the SWR and the
radiation pattern may be influenced.
The antenna is easily field-tuned following the instructions below, or it
can be ordered factory-tuned for CELLULAR or customer-specified
frequencies. See ordering information below.
Materials used are 18/8 stainless steel, UV-stabilized plastic and triple-
plated chromed brass.
ORDERING DESIGNATIONS
TYPE PRODUCT NO. FREQUENCY
GP 450-3/l 100000134 Tunable within 380…410 MHz
GP 450-3/h 100000135 Tunable within 406…470 MHz
PLEASE NOTE: The GP 450-3/… can also be delivered factory tuned to a specific frequency or cellular
network, such as TETRA. In this case, please add frequency or name of the network to the antenna
model, e.g. GP 450-3/390 MHz.
SPECIFICATIONS
ELECTRICAL
MODEL GP 450-3/...
ANTENNA TYPE Collinear ground-plane antenna
FREQUENCY Tunable by cutting within:
l: 380…410 MHz
h: 406…470 MHz
IMPEDANCE Nom. 50 Ω
RADIATION Omnidirectional
POLARIZATION Vertical
GAIN 5 dBi 3 dBd
BANDWIDTH 10 MHz @ SWR < 1.5
SWR ≤ 1.3 @ f. res.
MAX. POWER 250 W
MECHANICAL
TEMP. RANGE -30° C → +70° C
CONNECTOR N-female
WIND SURFACE 0.0131 m²
WIND LOAD 17 N @ 160 km/h
COLOUR Bright chrome
MATERIALS Bright polished stainless steel.
Bright chromed brass. Weather- and shockproof
plastics
TOTAL HEIGHT Approx. 730 mm (at 406 MHz)
DIA. IN TOP END 2 mm
DIA. IN BOTTOM
END
3 mm
WEIGHT Approx. 780 g
MOUNTING On 27 mm dia. mast tube (¾” water pipe)
CUTTING DIAGRAM
TUNING INSTRUCTIONS
The GP 450-3/…must be tuned to the operating frequency according to the
following instructions:
Only for GP 450-3/h: Cut the top section (L1) above the phasing coil 1.
as indicated in the cutting diagram, depending on whether operating
in the lower end or the higher end of the band 406 – 470 MHz.
Tune the antenna using an SWR-meter by cutting the bottom end of
2.
the whip (L2). The whip is loosened from the nipple using the
accompanying hex key. Use the cutting diagram above as a guide for
this procedure.
Do not cut the radials.
PROCOM A/S reserve the right to amend specifications
without prior notice.
06/10/11