TYPICAL TUNING DIAGRAMS
Model
GPA 27-45GPA 27-45
GPA 27-45GPA 27-45
GPA 27-45
Ground Plane Antenna 27-45 MHzGround Plane Antenna 27-45 MHz
Ground Plane Antenna 27-45 MHzGround Plane Antenna 27-45 MHz
Ground Plane Antenna 27-45 MHz
Installation ManualInstallation Manual
Installation ManualInstallation Manual
Installation Manual
B Copyright SIRIO antenne - Technical Data are subjected to change - Printed in ITALY - Rev. 31/07/1997 - Cod. ID174
NOTE:
It is recommended to use the curves as a guide and fine-tune using an SWR-Meter.
MOUNTING INSTRUCTIONS
TYPICAL S.W.R. RESPONSE
SPECIFICATIONS
1/4 λ Ground Plane
27-45 MHz tunable by diagram
50 Ω Unbalanced
Omnidirectional
Vertical
0 dBd - 2.14 dBi
2.5 MHz at 27 MHz
≤ 1.2 : 1
1000 Watts
Direct / Center
UHF Female
Aluminium, Chromed Brass, Nylon, Stainless Steel
126 N at 150 Km/h / 130 Km/h
0.11 m
2
4730 mm
1250 gr
2680 mm
∅ 35-40 mm
Electrical Data
Type :
Frequency Range :
Impedance :
Radiation :
Polarization :
Gain :
Bandwidth at V.S.W.R. 2:1 :
V.S.W.R. at f. res. :
Max Power :
Feed System / Position :
Connection :
Mechanical Data
Materials :
Wind Load / Resistance :
Wind Surface :
Height (approx.) :
Weight (approx.) :
Radial Length (approx) :
Mounting Mast :
25.4 27 28.6
f. (MHz)
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
S.W.R.
ID174
DESCRIPTION
1/4 λ Ground Plane antenna for base station service working on 27-45 MHz by means of the
tuning diagram enclosed. It is entirely made of non-corrosive aluminium and assembled on a
strong die-cast base which allows an easy and safe installation assuring very good performances.
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