Instruction Manual

GP 450/...
¼ λ Ground-Plane Antenna for the 450 MHz Band
DESCRIPTION
GP 450/… is a ground-plane antenna of the triple-leg type.
The antenna is delivered in two models tunable over the ranges
380…430 MHz (l) and 420…470 MHz (h), respectively, by adjusting the
length of the radiator.
The cutting diagram below indicates how long the radiator must be
corresponding to a specific centre frequency. The radiator is measured
from its free end (excl. top knob) to the bottom of the black insulator.
Do not cut the radials – they should be left untouched.
GP 450/… comprises a GP-head, one radiator and threeradials – all
made of chromed brass.
GP 450/… is made of first-class materials and will endure “wear and
tear” for years – no maintenance required.
ORDERING DESIGNATIONS
TYPE NO. PRODUCT NO. FREQUENCY
GP 450/l 100000128 Tunable within 380…430 MHz
GP 450/l-42 mm 100000130 Same as above
GP 450/h 100000129 Tunable within 420…470 MHz
GP 450/h-42 mm 100000133 Same as above
SPECIFICATIONS
ELECTRICAL
MODEL GP 450/...
ANTENNA TYPE ¼ λ ground-plane antenna
FREQUENCY l: 380…430 MHz
h: 420…470 MHz
IMPEDANCE Nom. 50 Ω
RADIATION Omnidirectional
POLARIZATION Vertical
GAIN 2 dBi 0 dBd
BANDWIDTH 40 MHz @ SWR 2.0
SWR ≤ 1.2 @ f. res.
MAX. POWER 1 kW
MECHANICAL
TEMP. RANGE -30° C → +70° C
CONNECTOR UHF-female (fitting PL-259)
WIND SURFACE 0.0128 m²
WIND LOAD 16 N @ 160 km/h
COLOUR Bright chrome
MATERIALS Chromed brass. Weather- and shockproof plastics
TOTAL HEIGHT Approx. 340 mm
ANTENNA ELEMENT DIA. 8 mm
WEIGHT Approx. 900 g
MOUNTING 38 mm dia. mast tube
(42 mm dia. as option, see note)
PLEASE NOTE
The GP 450/… can be delivered with a GP-head for mounting on
42 mm dia. mast tube (standard is 38 mm) when ordering as option GP
450/…-42 mm.
CUTTING DIAGRAM
PROCOM A/S reserve the right to amend specifications
without prior notice.
06/10/11