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VHF CENTER FED DIPOLE

 

These antennas are ideal for wide band applications and can be stacked vertically and fed in phase using two/four dipoles a gain of 3 dB/6 dB respectively can be obtained.

SPECIFICATIONS

Gain over 1/2 wave Dipole Unity

V.S.W.R Better than 1-5:1 over the operating Band

Maximum Input Power Rating 150watts

input impedance 50OHMS

Bandwidth + 1 5% of center frequency

Polarization Vertical or horizontal

Connection 3 metre length of RG213 fitted with N type socket & PVC sleeve

Support Boom 1 1/4" x 12swg Aluminium Alloy Tube

HE30TF

Radiating Elements 3/4" x 16swg Aluminium Alloy Tube HE9TF

Castings Aluminium Alloy Kemloc

Insulator Black Carbon Polyethylene

Nuts & Bolts 18/8 Stainless Steel & Nyloc Nut A2

Weight 2.3 Kgs

Windloading 7.0 Kgf (1 5.4 lbf) @ wind velocity of 160 Kph

 

 

UHF CENTER FED DIPOLE

 

These antennas are ideal for wide band applications and can be stacked vertically and fed in phase using two/four dipoles. A gain of 3 dB/6 dB respectively can be obtained.

SPECIFICATIONS

Gain over 1/2 wave Dipole Unity

V.S.W.R. Better than 1.5:1 over the operating Band

Maximum Input Power Rating 150 watts

Input Impedance 50 OHMS

Bandwidth 11 % of center frequency

Polarisation Vertical or horizontal

Connection 3 metre length of RG213 fitted with N type socket & PVC sleeve

Support Boom 1 1/4" x 12swg Aluminium Alloy Tube HE30TF

Radiating Elements 1/2" x 16swg Aluminium Alloy Tube HE9TF

Castings Aluminium Alloy Kemloc

Insulator Black Carbon Polyethylene

Nuts & Bolts 18/8 Stainless Steel & Nyloc Nuts A2

Weight 1.5 Kgs

Windloading 5 Kgf (1 1 lbf) @ wind velocity of 160 Kph

 

 

3 ELEMENT VHF YAGI

 

 

These antennas can be stacked and fed in phase with a matching harness for increased gain.

SPECIFICATIONS

Gain over 1/2 wave Dipole 6dB

V.S.W.R. Better than 1.5: 1 over the operating Band

Input Impedance 50 OHMS

Maximum Input Power Rating 200 watts

Bandwidth 7% of center frequency

Polarisation Vertical or horizontal

Half Power Beamwidth E Plane 600

H Plane 820

Front to Back Ratio 18dB

Connection 3 metre length of RG213 fitted with N type socket & PVC sleeve

Support Boom 1 1/4" x 12swg Aluminium Alloy Tube HE30TF

Radiating Elements 3/4" x 16swg Aluminium Alloy Tube HE9TF

Castings Aluminium Alloy Kemloc

Nuts & Bolts 18/8 Stainless Steel with Nyloc Nuts

Insulator Black Carbon Loaded Polyethylene

Windloading

 

Weight @ 7OMHz 4.5 Kgs 22 Kgf @ wind Velocity of 160 Kph

@ 106MHz 3.9 Kgs 13.1 Kgf @ wind Velocity of 160 Kph

@ 139MHz 3.1 Kgs 12 Kgf @ wind Velocity of 160 Kph

@ 165MHz 2.5 Kgs 8.5 Kgf @ wind Velocity of 160 Kph

@ 19OMHz 2.0 Kgs 7.4 Kgf @ wind Velocity of 160 Kph

 

8 ELEMENT UHF YAGI

These antennas can be stacked and fed in phase with a matching harness for increased gain.

SPECIFICATIONS

Gain over 1/2 wave Dipole lOdB

V.S.W.R. Better than 1.5:1 over the operating Band

Input Impedance 50 OHMS

Maximum Input Power Rating 200 watts

Bandwidth 4% of center frequency

Polarisation Vertical or horizontal

Half Power Beamwidth E Plane 40' H Plane 50'

Front to Back Ratio 20 dBs

Connection 3 metre length of RG21 3 fitted with N type socket & PVC sleeve

Support Boom 1 1/4" x 12swg Aluminium Alloy Tube HE30TF

Radiating Elements 1/2" x 16swg Aluminium Alloy Tube HE9TF

Castings Aluminium Alloy Kemloc

Nuts & Bolts 18/8 Stainless Steel with Nyloc Nuts

Insulator Black Carbon Loaded Polyethylene

Weight @ 3kgs

Windloading @ 440 MHz 12 Kgf (26.5lbf) @ wind velocity of 160 Kph

 

 

UHF DOWNFIRE ANTENNA

It consists of two half wave dipoles at 90 degrees of each other and fed in phase with a matching harness.

This antenna is very robust and can withstand the harshest environmental conditions.

This antenna can be easily installed and with a bandwidth of 25 MHz it can operate both on transmit or receive frequencies without the loss of performance.

SPECIFICATIONS

Gain over 1/2 wave Dipole 6dB

V.S.W.R. Better than 1.5:1 over the operating Band

Maximum Input Power Rating 200 watts

Input Impedance 50 OHMS

Bandwidth 4% of center frequency

Polarisation Vertical

Half Power Beamwidth 90' E & H Plane

Connection N type socket

Mounting Boom 1 1/2" x 18swg Aluminium Alloy Tube

Radiating Elements 3/8" diameter aluminium Rod

Nuts & Bolts 18/8 Stainless Steel A2

Insulator Black Carbon Loaded Polyethylene

Length 0.8 metres

Weight 1.0 Kgs (2.2 lbs.)

Windloading 5 Kgf C@ wind velocity of 160 Kph

 

UHF 4 STACK ARRAY

AVAILABLE WITH 5 OR 10 DEGREE ELECTRICAL DOWN TILT

The array comprises of four vertical dipoles mounted on a 1 1/2" O.D. dia. x 10 swg aluminium support boom forming this antenna. The dipoles are fed in phase by a special matching harness which can incorporate a 5 or 10 degree down tilt. Completely seal moulded in black carbon loaded polyethylene. The dipoles can be orientated from their omnidirectional position to one side of the boom (vertically in line) to give directional coverage.

These antennas can be stacked one above the other for talkthrough/duplex working. Special mounting kits are available on request for stacking these antennas.

 

SPECIFICATIONS

Gain over 1/2 wave Dipole Omni-directional 5.5 dB

Directional 7.5 dB

V.S.W.R. Better than 1.5:1 over the

operating Band

Maximum Input Power Rating 250 watts

Input Impedance 50OHMS

Bandwidth 7% of center frequency

Polarisation Vertical

Connection 3 metre length of RG21 3 fitted with

N type socket & PVC sleeve

Mounting Boom 1 1/2" x 1 Oswg Aluminium Alloy Tube HE30TF

Radiating Elements 1/2" x 16swg Aluminium Alloy Tube HE9TF

Castings Aluminium Alloy Kemloc

Insulator Black Carbon Loaded Polyethylene

Nuts & Bolts 18/8 Stainless Steel & Nyloc Nut

Length 90" (2.3 metres)

Weight 5 Kgs

Windloading 12.5 Kgf @ wind velocity of 160 Kph

 

3db Gain VHF COLLINEAR ANTENNA

 

These antennas are most suited for mast head fixing for omnidirectional applications, but can also be side mounted to give some degree of directivity. Collinear stand-off brackets can be supplied as an optional extra.

SPECIFICATION

Gain over 1/2 wave Dipole 3dB

V.S.W.R. Better than 1.5:1 over the operating Band

Maximum Input Power Rating 150 watts

Input Impedance 50 OHMS

Bandwidth 2% of center frequency

Polarisation Vertical

Half Power Beamwidth 320

Connection 500mm length of RG213 terminated N type socket and PVC sleeve

Radiating Elements Brass rod plasfilm coated

Encapsulation Reinforced glass fibre tube

Length 1. 1 60 metres @ 460 MHz

Weight 1. 1 Kgs

Windloading 6.4 Kgf @ wind velocity of 16OKph

 

UHF 3 dB GAIN COLLINEAR ANTENNA

These antennas are most suited for mast head fixing for omnidirectional applications, but can also be side mounted to give some degree of directivity. Collinear stand-off brackets can be supplied as an optional extra.

SPECIFICATION

Gain over 1/2 wave Dipole 6dB

V.S.W.R. Better than 1.5:1 over the operating Band

Maximum Input Power Rating 150 watts

Input Impedance 50 OHMS

Bandwidth 2% of center frequency

Polarisation Vertical

Half Power Beamwidth 180

Connection 450mm length of RG213 fitted with N type socket and PVC sleeve

Encapsulation Reinforced tapered glass f ibre tube

Mounting Brackets CVB type - supplied

Mounting Stub 1 3/4" x 10 swg Aluminium Alloy Tube H E30TF

Length 1 Oft (3.05 metres)

Weight 3 Kgs

Windloading 12.2 Kgf (27.2 lbf) @ wind velocity of 160 Kph

 

UHF 6DB GAIN COLLINEAR ANTENNA

6 dB GAIN OVER 1/2 WAVE DIPOLE

These antennas are most suited for mast head fixing for omnidirectional applications, but can also be side mounted onto structures to give some degree of directional characteristics. Collinear standoff brackets can be supplied ex stock.

SPECIFICATION

Gain over 1/2 wave Dipole 6dB

V.S.W.R. Better than 1-5:1 over the operating Band

Maximum Input Power Rating 150 watts

Input Impedance 50 OHMS

Bandwidth +- 4% of center frequency

Polarisation Vertical

Half Power Beamwidth 17'

Connection 500mm length of RG213 fitted with N type socket complete with PVC sleeve

Encapsulation Reinforced tapered glass fibre tube low alkali

Radiating Elements Brassrod

Support Base Tube 1 1/2" x 1Oswg Aluminium Alloy Tube HE30TF

Length 1.3 metres

Weight 1.2 Kgs

Windloading 3.6 Kgf @ wind velocity of 160 Kph

 

Please not this list is not exhaustive, but an illustration of the more commonly used types of antenna.

 

 

 

 
 

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Last modified: February 09, 2006