GPF 22 N
VHF Base Station Antenna 135...175 MHz
B Copyright SIRIO antenne - Technical Data are subjected to change - Printed in ITALY - Rev. 07/07/2006 - Cod. ID271
HI-QUALITY ANTENNAS MADE IN ITALY
TYPICAL TUNING DIAGRAMS
MATCHING & BANDWIDTH DIAGRAMS
NOTE:
! Use the curves just as a guide. For fine-tuning please use an SWR-Meter.
DESCRIPTION
2x5/8 l Ground Plane base station colinear antenna for land and marine service. It works on
135...175 MHz by using the cutting diagram enclosed. The matching coil is DC feeded for a
perfect protection from the static discharges. GPF 22-N is made of fiberglass, non-corrosive
aluminium, stainless steel and its die-cast strong base assures the maximum robustness and the
best performance. Tuning is easy by following the attached directions
SPECIFICATIONS
ID271
Electrical Data
Type : 2 x 5/8 l
Frequency Range : 135...175 MHz tunable by cutting
Impedance : 50 W
Radiation (H-Plane) : 360° Omnidirectional
Radiation (E-Plane) : Beamwidth at -3 dB = 35°
Radiation Angle deg. : 0°
Polarization : Linear Vertical
Gain : 3.8 dBd, 5.95 dBi
Bandwidth @ SWR £ 2 : see diagram
SWR @ res. freq. : see diagram
Max Power : 200 Watts
Grounding Protection :
Connector : N-female, Gold Plated central pin
Mechanical Data
Materials : Fiberglass, Aluminium, Brass, Stainless steel
Wind Load / Resistance : 95 N at 150 Km/h / 150 Km/h
2
Wind Surface : 0.08 m
Height (approx.) : 3230 mm
Weight (approx.) : 1630 gr
Radial Length (approx.) : 495 mm
Mounting Mast : Æ 35-54 mm
Ground Plane Colinear
All metal parts are DC-grounded, the inner conductor is coupled
capacitively
HI-QUALITY ANTENNAS MADE IN ITALY
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A T T E N T I O N ! !
Cut the whips on
the bottom sides only
Bottom view
N-female connector
1) Unlock the hexagonal socket
bottom screw using the enclosed
key.
2) Remove the internal coil.
3) Remove the top cap and push
the internal whip to the top
4) Pull the internal whip and re_
move it.
5) Unlock the central coil. Choose
the working frequency and cut the
whips according to the suitable
“Typical tuning diagram”.
NOTE: Use the curves just as a
guide. For fine-tuning please use
an SWR-Meter.
6) Insert the whip from the bottom
7) Mount and lock the coil, assem_
ble the top cap.
8) Lock the bottom screw.
9) Finally assemble the radials and
the side mounting bracket.
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MOUNTING AND TUNING INSTRUCTIONS
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