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Tuneable UHF - Half -Wave Dipole With...
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The Schwarzbeck UHA 9125 C Dipole Total Length of 150mm, Shorting Bar Max. Rear Pos.
Due to unwanted, but unavoidable reflections at mast adapter, indexing ring and cable etc. the shown directional patterns deviate somewhat from the theoretical pattern shape (typically less than 1 dB). The H-plane pattern of an ideal half-wave dipole is circular. The half power beamwidth (- 3 dB) of the ideal half-wave dipole is 78°. The reflections in the antennas' direct surrounding increase the gain figure in forward direction (to the right in the above sketch) by +0.5 dB typically (theoretical isotropic gain of a half-wave dipole: 2.15 dBi).
Tuned Half Wave Dipole with EMI-Balun 0.75 - 2 GHz
Insertion of an attenuator is advisable if the equipment presents a high internal SWR (e.g. in the 0 dB position of an internal step attenuator. In this case the attenuation must be added to the antenna factor (dB/m) or subtracted from the gain (dBi, dBd)
Serial Number | 9125C109 |
Test result | o.k. |
Operator | Dipl.-Ing. D. Schwarzbeck |