Sirio Antenne CX 4m series Installation Manual

CX 4m seriesCX 4m series

CX 4m seriesCX 4m series

CX 4m series

VHF Base Station Antennas 68...88 MHzVHF Base Station Antennas 68...88 MHz

VHF Base Station Antennas 68...88 MHzVHF Base Station Antennas 68...88 MHz

VHF Base Station Antennas 68...88 MHz

Installation ManualInstallation Manual

Installation ManualInstallation Manual

Installation Manual

B Copyright SIRIO antenne - Technical Data are subjected to change - Printed in ITALY - Rev. 09/04/2008 - Cod. ID075

HI-QUALITY ANTENNAS MADE IN ITALY

NOTE:

 L is the lenght indicated in the above pictures.
 It is recommended to use the curves just as a guide. Fine-tuning by using an SWR-Meter.

TYPICAL TUNING DIAGRAMS

DESCRIPTION

3/4 λ VHF antenna for base station service made of high quality materials to get the best
performance and the maximun efficiency. It is completely manufactured with aluminium tubes
and nylon for its great robustness and it is supplied with a solid steel bracket for an easy and safe
installation. Its Gamma Match feed makes it earthed for a perfect protection against the static
discharges. Simple and strong, it is particularly recommended for a professional use.

SPECIFICATIONS

Electrical Data

Type : 3/4 λ Coax. J-Pole
Frequency Range : CX 4-68 from 68 to 73 MHz tunable by diagram

: CX 4-73 from 73 to 78 MHz tunable by diagram
: CX 4-78 from 78 to 83 MHz tunable by diagram
: CX 4-83 from 83 to 88 MHz tunable by diagram

Impedance : 50 Ω Unbalanced
Radiation (H-plane) : 360o Omnidirectional
Radiation (E-plane) : Beamwidth at -3 dB = 60

o

Radiation angle deg. : 3

o

Polarization : Vertical
Gain : 2 dBd - 4.15 dBi
Bandwidth @ SWR 1.5 : CX 4-68 ≥ 1.7 MHz @ 68 MHz

: CX 4-73 ≥ 2.0 MHz @ 73 MHz
: CX 4-78 ≥ 2.5 MHz @ 78 MHz
: CX 4-83 ≥ 2.5 MHz @ 83 MHz

SWR @ res. freq. : ≤ 1.2
Max Power : 500 Watts
Feed System / Position : Gamma Match / Base
Connector : UHF Female

Mechanical Data

Materials : Nylon, Brass, Steel, Aluminium
Wind Load / Resistance : 97 N at 150 Km/h / 150 Km/h
Wind Surface : 0.08 m

2

Height (approx.) : from 2700 to 3360 mm
Weight (approx.) : 1900 gr
Mounting Mast : ∅ 35-42 mm

ID075

HI-QUALITY ANTENNAS MADE IN ITALY

MOUNTING INSTRUCTIONS

Correct mounting on mast

Wrong mounting on mast

HARDWARE PARTS LIST

Qty Descriptions

n.2 M6x160 U-bolts

n.4 M6 Flat washer

n.4 M6 Lock washer

n.4 M6 Hex nut

n.1 M4x4 Hexagon socket set screw

n.1 2mm

Exagonal key

n.1 ∅10mm PVC cap

See tuning diagrams next

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