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TYPICAL TUNING DIAGRAMS
Model GP 3-E
VHF Base Station Antenna 135-175 MHz
NOTE:
• It is recommended to use the curves as a guide and fine-tune using an SWR-Meter.
B Copyright SIRIO antenne - Technical Data are subjected to change - Printed in ITALY - Rev. 01/07/1998 - Cod. ID059
Installation Manual
DESCRIPTION
5/8 λ Ground Plane base station antenna for land and marine service. It works on the frequency
range of 135-175 MHz by using the tuning diagram enclosed. The matching coil is DC feeded
for a perfect protection from the static discharges. GP 3-E is made of non-corrosive aluminium
and assembled on a very strong base of die-cast metal to get the maximun robustness and the
best performance. Tuning is easy by following the attached directions.
SPECIFICATIONS
Electrical Data
Type
Frequency Range
Impedance
Radiation (H-plane)
Radiation (E-plane)
Radiation angle deg.
Polarization
Gain
Bandwidth at V.S.W.R. 2:1
V.S.W.R. at res. freq.
Max Power
Feed System / Position
Connection
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5/8 λ Ground Plane
135-175 MHz tunable by diagram
50 Ω Unbalanced
360o Omnidirectional
Beamwidth at -3 dB = 67o
18o
Vertical
1.5 dBd - 3.65 dBi
6.7 MHz at 135 MHz
≤ 1.2 : 1
200 Watts
Transformer DC-Ground / Base
UHF Female
Mechanical Data
Materials
Wind Load / Resistance
Wind Surface
Heigth (approx.)
Weight (approx.)
Mounting Mast
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Aluminium, Nylon
28 N at 150 Km/h / 150 Km/h
0.02 m2
1480 mm
570 gr
∅ 25-30 mm
ID059
MOUNTING INSTRUCTIONS