Dipoles

 Tuned half-wave dipoles have been among the most important antennas from the
beginning of rf-technique. The characteristics of half-wave dipoles have
been calculable very early using the Maxwell and Hertz equations. Therefore the half
wave dipole became a reference antenna. The ideal (lossless) half-wave dipole has an
isotropic gain of 2.15 dBi and an impedance of 73 Ohm. The directional pattern is circular in
the H-plane, "8-shaped" in the E-plane with the maxima perpendicular on the dipole axis.
The half-power beamwidth (-3 dB) is approx. 78°. The impedance of real dipoles is
depending on the thickness/length ratio of its elements, typical values are 60-70 Ohm.
Dipoles for industrial applications are available in the frequency range from 30
MHz to up to approx. 4 GHz. The dipole elements are length variable (telescopic) or
with fixed length, the latter especially above 1 GHz. The most important applications are
test site evaluations (NSA, normalized site attenuation) and the determination of ERP
(Effective Radiated Power) respectively EIRP (Effective Isotropic Radiated Power). 

 

 

VHA 9103

 

VHF Half-Wave Dipole with 2 sets of telescopic elements

30-300 MHz

 

UHA 9105

 

Tuneable UHF - Half - Wave Dipole

300 - 1000 MHz

w. telescopic elements

 

UHA 9125 C

 

Tuneable UHF - Half -Wave Dipole

with EMI -Balun

0.75 - 2 GHz with 4 sets of elements

LE = 180, 140, 100, 80 mm

 

UHA 9125 D

 

Tuneable UHF - Half - Wave Dipole

with EMI - Balun

1.0 - 3 (4) GHz with 6 sets of elements

LE = 140, 114, 90, 72, 60, 48 mm

 

VHAP

 

VHF Precision Dipole 30-300 MHz

2 sets of telescopic elements

(mostly required in pairs) CISPR 16-1-5

 

VHAPA

 

Calibration adaptor for VHAP Precision Dipoles

 

CCA

 

Carrying and storing case

for 2 x VHAP or 2 x UHAP

cases for other antennas also available

 

UHAP

 

UHF Precision Dipole

300-1000 MHz

(VHAP & UHAP mostly required in pairs)

CISPR 16-1-5

 

UHAPA

 

Calibration adaptor for UHAP Precision Dipoles

 

 ILS Dipole

 

Linear polarized half-wave dipole with 1:1 balun and fixed element length for fieldstrength measurements at instrument landing systems (ILS).

 

Frequency range:

localizer: 108 - 118 MHz (LOC, LLC)

glideslope: 320 - 340 MHz (G/S)

Gain: 1.5 dBi

 

TETRA DIPOLE

 

Linear polarized half-wave dipole with 1:1 balun and fixed element length for  measurements at TETRA (terrestrical trunked radio) networks.

 

Frequency range: 340 - 480 MHz

Gain: typ. 1.5 dBi

 

 

 

 

 

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