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MOUNTING INSTRUCTIONS

DESCRIPTION

1/4 

λ 

Ground Plane wide-band antenna for base station service. It is made of aluminium and hi-

quality materials to get the best efficiency and robustness. Its radial whip is earthed to be protected

against the static discharges. GP 87-108 LB is developed for FM radio band and GP 108-136 LB

is particularly recommended for the aereonautic band service.

SPECIFICATIONS

Electrical Data

Type

:

1/4 

λ

  Folded Ground Plane

Frequency Range

   GP 87-108 LB

:

RADIO band: 87-108 MHz at V.S.W.R. 

 2.5 :1

   GP 108-136 LB

:

VHF AIR. band: Rx 108-136 MHz; Tx 118-136 at V.S.W.R. 

 2:1

Impedance

:

50

 

 Unbalanced

Radiation (H-plane)

:

360

o

 Omnidirectional

Radiation (E-plane)

:

Beamwidth at -3 dB = 78

o

Radiation angle deg.

:

0

o

Polarization

:

Vertical

Gain

:

0 dBd - 2.15 dBi

Bandwidth at V.S.W.R. 2:1

   GP 108-136 LB

:

22 MHz

V.S.W.R. at res. freq.

:

 1.2 : 1

Max Power

:

1000 Watts

Feed System / Position

:

Direct DC-Ground / Center

Connector

   GP 87-108 / 108-136 LB-U :

UHF Female

   GP 87-108 / 108-136 LB-N :

N Female

Mechanical Data

Materials

:

Anodized Aluminium, Nylon, Stainless Steel

Wind Load / Resistance

   GP 87-108 LB

:

67 N at 150 Km/h / 160 Km/h

   GP 108-136 LB

:

56 N at 150 Km/h / 160 Km/h

Wind Surface

   GP 87-108 LB

:

0.06 m

2

   GP 108-136 LB

:

0.05 m

2

Height (approx.)

   GP 87-108 LB

:

1190 mm

   GP 108-136 LB

:

890 mm

Weight (approx.)

   GP 87-108 LB

:

1500 gr

   GP 108-136 LB

:

1310 gr

Mounting Mast

:

 

36-40 mm

ID124

www.hfelectronics.be

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