GPF 22 N VHF Base Station Antenna 135...175 MHz TYPICAL TUNING DIAGRAMS !

GPF 22 N VHF Base Station Antenna 135...175 MHz TYPICAL TUNING DIAGRAMS !
TYPICAL TUNING DIAGRAMS
GPF 22 N
VHF Base Station Antenna 135...175 MHz
NOTE:
! Use the curves just as a guide. For fine-tuning please use an SWR-Meter.
MATCHING & BANDWIDTH DIAGRAMS
HI-QUALITY ANTENNAS MADE IN ITALY
B Copyright SIRIO antenne - Technical Data are subjected to change - Printed in ITALY - Rev. 07/07/2006 - Cod. ID271
DESCRIPTION
MOUNTING AND TUNING INSTRUCTIONS
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
Electrical Data
Type
Frequency Range
Impedance
Radiation (H-Plane)
Radiation (E-Plane)
Radiation Angle deg.
Polarization
Gain
Bandwidth @ SWR £ 2
SWR @ res. freq.
Max Power
Grounding Protection
Connector
: 2 x 5/8 l Ground Plane Colinear
: 135...175 MHz tunable by cutting
: 50 W
: 360° Omnidirectional
: Beamwidth at -3 dB = 35°
: 0°
: Linear Vertical
: 3.8 dBd, 5.95 dBi
: see diagram
: see diagram
: 200 Watts
: All metal parts are DC-grounded, the inner conductor is coupled
capacitively
: N-female, Gold Plated central pin
Mechanical Data
Materials
Wind Load / Resistance
Wind Surface
Height (approx.)
Weight (approx.)
Radial Length (approx.)
Mounting Mast
: Fiberglass, Aluminium, Brass, Stainless steel
: 95 N at 150 Km/h / 150 Km/h
: 0.08 m2
: 3230 mm
: 1630 gr
: 495 mm
: Æ 35-54 mm
HI-QUALITY ANTENNAS MADE IN ITALY
ID271
Bottom view
N-female connector
ATTENTION!!
Cut the whips on
the bottom sides only
4
1
3
2
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.
5
8
6
7
9
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