TYPICAL TUNING DIAGRAMS
Model GPA 27-45
Ground Plane Antenna 27-45 MHz
NOTE:
It is recommended to use the curves as a guide and fine-tune using an SWR-Meter.
Installation Manual
B Copyright SIRIO antenne - Technical Data are subjected to change - Printed in ITALY - Rev. 31/07/1997 - Cod. ID174
DESCRIPTION MOUNTING INSTRUCTIONS
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.
SPECIFICATIONS
Electrical Data
Type : 1/4 λ Ground Plane
Frequency Range : 27-45 MHz tunable by diagram
Impedance : 50 Ω Unbalanced
Radiation : Omnidirectional
Polarization : Vertical
Gain : 0 dBd - 2.14 dBi
Bandwidth at V.S.W.R. 2:1 : 2.5 MHz at 27 MHz
V.S.W.R. at f. res. : ≤ 1.2 : 1
Max Power : 1000 Watts
Feed System / Position : Direct / Center
Connection : UHF Female
Mechanical Data
Materials : Aluminium, Chromed Brass, Nylon, Stainless Steel
Wind Load / Resistance : 126 N at 150 Km/h / 130 Km/h
Wind Surface : 0.11 m2
Height (approx.) : 4730 mm
Weight (approx.) : 1250 gr
Radial Length (approx) : 2680 mm
Mounting Mast : ∅ 35-40 mm
TYPICAL S.W.R. RESPONSE
S.W.R.
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
25.4 27 28.6
f. (MHz)
ID174
TYPICAL TUNING DIAGRAMS
Model GPA 40-70
VHF Ground Plane Antenna 40-70 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. 02/07/1998 - Cod. ID175
Installation Manual
DESCRIPTION MOUNTING INSTRUCTIONS
1/4 λ Ground Plane antenna for base station service working on 40-70 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.
SPECIFICATIONS
Electrical Data
Type : 1/4 λ Ground Plane
Frequency Range : 40-70 MHz tunable by diagram
Impedance : 50 Ω Unbalanced
Radiation (H-plane) : 360o Omnidirectional
Radiation (E-plane) : Beamwidth at -3 dB = 86o
Radiation angle deg. : 0o
Polarization : Vertical
Gain : 0 dBd - 2.15 dBi
Bandwidth at V.S.W.R. 2:1 : 3.5 MHz at 40 MHz
V.S.W.R. at res. freq. : ≤ 1.2 : 1
Max Power : 1000 Watts
Feed System / Position : Direct / Center
Connection : UHF Female
Mechanical Data
Materials : Aluminium, Chromed Brass, Nylon, Stainless Steel
Wind Load / Resistance : 85 N at 150 Km/h / 150 Km/h
Wind Surface : 0.07 m2
Height (approx.) : 3200 mm
Weight (approx.) : 935 gr
Radial Length (approx) : 1800 mm
Mounting Mast : ∅ 35-40 mm
ID175
TYPICAL TUNING DIAGRAMS
Model GPA 66-108
VHF Ground Plane Antenna 66-108 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. 02/07/1998 - Cod. ID176
Installation Manual
DESCRIPTION MOUNTING INSTRUCTIONS
1/4 λ Ground Plane antenna for base station service working on 66-108 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.
SPECIFICATIONS
Electrical Data
Type : 1/4 λ Ground Plane
Frequency Range : 66-108 MHz tunable by diagram
Impedance : 50 Ω Unbalanced
Radiation (H-plane) : 360o Omnidirectional
Radiation (E-plane) : Beamwidth at -3 dB = 86o
Radiation angle deg. : 0o
Polarization : Vertical
Gain : 0 dBd - 2.14 dBi
Bandwidth at V.S.W.R. 2:1 : 6.5 MHz at 66 MHz
V.S.W.R. at res. freq. : ≤ 1.2 : 1
Max Power : 500 Watts
Feed System / Position : Direct / Center
Connection : UHF Female
Mechanical Data
Materials : Aluminium, Chromed Brass, Nylon, Stainless Steel
Wind Load / Resistance : 54 N at 150 Km/h / 150 Km/h
Wind Surface : 0.05 m2
Height (approx.) : 1930 mm
Weight (approx.) : 700 gr
Radial Length (approx) : 1080 mm
Mounting Mast : ∅ 35-40 mm
ID176
TYPICAL TUNING DIAGRAMS
Model GPA 108-136
VHF Ground Plane Antenna 108-136 MHz
NOTE:
It is recommended to use the curves as a guide and fine-tune using an SWR-Meter.
Installation Manual
B Copyright SIRIO antenne - Technical Data are subjected to change - Printed in ITALY - Rev. 02/07/1998 - Cod. ID177
DESCRIPTION MOUNTING INSTRUCTIONS
1/4 λ Ground Plane antenna for base station service working on 108-136 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.
SPECIFICATIONS
Electrical Data
Type : 1/4 λ Ground Plane
Frequency Range : 108-136 MHz tunable by diagram
Impedance : 50 Ω Unbalanced
Radiation (H-plane) : 360o Omnidirectional
Radiation (E-plane) : Beamwidth at -3 dB = 86o
Radiation angle deg. : 0o
Polarization : Vertical
Gain : 0 dBd - 2.15 dBi
Bandwidth at V.S.W.R. 2:1 : 12 MHz at 108 MHz
V.S.W.R. at res. freq. : ≤ 1.2 : 1
Max Power : 500 Watts
Feed System / Position : Direct / Center
Connection : UHF Female
Mechanical Data
Materials : Aluminium, Chromed Brass, Nylon, Stainless Steel
Wind Load / Resistance : 35 N at 150 Km/h / 150 Km/h
Wind Surface : 0.03 m2
Height (approx.) : 1185 mm
Weight (approx.) : 565 gr
Radial Length (approx) : 650 mm
Mounting Mast : ∅ 35-40 mm
ID177
TYPICAL TUNING DIAGRAMS
Model GPA 135-175
VHF Ground Plane Antenna 135-175 MHz
NOTE:
• It is recommended to use the curves as a guide and fine-tune using an SWR-Meter.
Installation Manual
B Copyright SIRIO antenne - Technical Data are subjected to change - Printed in ITALY - Rev. 02/07/1998 - Cod. ID178
DESCRIPTION MOUNTING INSTRUCTIONS
1/4 λ Ground Plane antenna for base station service working on 135-175 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.
SPECIFICATIONS
Electrical Data
Type : 1/4 λ Ground Plane
Frequency Range : 135-175 MHz tunable by diagram
Impedance : 50 Ω Unbalanced
Radiation (H-plane) : 360o Omnidirectional
Radiation (E-plane) : Beamwidth at -3 dB = 86o
Radiation angle deg. : 0o
Polarization : Vertical
Gain : 0 dBd - 2.15 dBi
Bandwidth at V.S.W.R. 2:1 : 13 MHz at 135 MHz
V.S.W.R. at res. freq. : ≤ 1.2 : 1
Max Power : 300 Watts
Feed System / Position : Direct / Center
Connection : UHF Female
Mechanical Data
Materials : Aluminium, Chromed Brass, Nylon, Stainless Steel
Wind Load / Resistance : 29 N at 150 Km/h / 180 Km/h
Wind Surface : 0.03 m2
Height (approx.) : 960 mm
Weight (approx.) : 520 gr
Radial Length (approx) : 520 mm
Mounting Mast : ∅ 35-40 mm
ID178
TYPICAL TUNING DIAGRAMS
Model GPA 170-230
VHF Ground Plane Antenna 170-230 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. 02/07/1998 - Cod. ID179
Installation Manual
DESCRIPTION MOUNTING INSTRUCTIONS
1/4 λ Ground Plane antenna for base station service working on 170-230 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.
SPECIFICATIONS
Electrical Data
Type : 1/4 λ Ground Plane
Frequency Range : 170-230 MHz tunable by diagram
Impedance : 50 Ω Unbalanced
Radiation (H-plane) : 360o Omnidirectional
Radiation (E-plane) : Beamwidth at -3 dB = 86o
Radiation angle deg. : 0o
Polarization : Vertical
Gain : 0 dBd - 2.15 dBi
Bandwidth at V.S.W.R. 2:1 : 19 MHz at 170 MHz
V.S.W.R. at res. freq. : ≤ 1.2 : 1
Max Power : 300 Watts
Feed System / Position : Direct / Center
Connection : UHF Female
Mechanical Data
Materials : Aluminium, Chromed Brass, Nylon, Stainless Steel
Wind Load / Resistance : 24 N at 150 Km/h / 180 Km/h
Wind Surface : 0.02 m2
Height (approx.) : 760 mm
Weight (approx.) : 480 gr
Radial Length (approx) : 410 mm
Mounting Mast : ∅ 35-40 mm
ID179
