Weidmuller WI-MOD-E-G Manuel d'utilisateur Page 14

  • Télécharger
  • Ajouter à mon manuel
  • Imprimer
  • Page
    / 110
  • Table des matières
  • MARQUE LIVRES
  • Noté. / 5. Basé sur avis des utilisateurs
Vue de la page 13
Weidmuller Wireless Ethernet Modem & Device Server WI-MOD-E-G/A User Manual
Rev.2.16 www.weidmuller.com14
The net gain of the antenna/cable configuration is determined by adding the antenna gain and the cable loss.
For example, if using the WI-MOD-E-G a 10dBi antenna (7.8dBd) with 10 meters of Cellfoil (-5.6dB) has a net gain of
2.2dB (7.8dB – 5.6dB).
Installation tips
Connections between the antenna and coaxial cable should be carefully taped to
prevent ingress of moisture. Moisture ingress in the coaxial cable is a common
cause for problems with radio systems, as it greatly increases the radio losses. We
recommend that the connection be taped, firstly with a layer of PVC Tape, then
with a vulcanizing tape such as “3M 23 tape”, and finally with another layer of
PVC UV Stabilized insulating tape. The first layer of tape allows the joint to be
easily inspected when trouble shooting as the vulcanizing seal can be easily
removed.
Where antennas are mounted on elevated masts, the masts should be effectively
earthed to avoid lightning surges. For high lightning risk areas, surge suppression
devices between the module and the antenna are recommended. If the antenna is
not already shielded from lightning strike by an adjacent earthed structure, a
lightning rod may be installed above the antenna to provide shielding.
Dipole and Collinear antennas
A dipole or collinear antenna transmits the same amount of radio power
in all directions - as such that are easy to install and use. The dipole
antenna with integral 15 ft (5m) cable does not require any additional
coaxial cable; however a cable must be used with the collinear antennas.
Collinear and dipole antennas should be mounted vertically, preferably 1
wavelength away (see drawing below for distances) from a wall or mast
and at least 3ft (1m) from the radio module to obtain maximum range.
Directional antennas.
Directional antennas can be
a Yagi antenna with a main beam and orthogonal elements, or
a directional radome, which is cylindrical in shape, or
a parabolic antenna.
A directional antenna provides high gain in the forward direction, but lower gain in other
directions. This may be used to compensate for coaxial cable loss for installations with
marginal radio path.
Yagi antennas should be installed with the main beam horizontal, pointing in the forward
direction. If the Yagi is transmitting to a vertically mounted omni directional antenna, then the
Yagi elements should be vertical. If the Yagi is transmitting to another Yagi, then the elements at
each end of the wireless link need to in the same plane (horizontal or vertical).
Directional radomes should be installed with the central beam horizontal and must be pointed
exactly in the direction of transmission to benefit from the gain of the antenna. Parabolic
Figure 1 -
V
ulcanising Tape
Figure 2 - Dipole Antenna
Figure 3 - Collinear
Antenna
Vue de la page 13
1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 109 110

Commentaires sur ces manuels

Pas de commentaire

Ofm E1007 manuales

Manuales del propietario y guías del usuario para Mueble Ofm E1007.
Ofrecemos 1 manuales en pdf Ofm E1007 para descargar gratis por tipos de documentos: Manual de usuario


Ofm E1007 Manual de usuario (1 paginas)


Marca: Ofm | Categoria: Furniture | Tamaño: 0.63 MB |

 

Tabla de contenidos





Más productos y manuales para Mueble Ofm

Modelos Tipo de documento
505-L Manual de usuario   OFM 505-L User Manual, 1 paginas
595-L Manual de usuario   OFM 595-L User Manual, 1 paginas
518-LX Manual de usuario   OFM 518-LX User Manual, 1 paginas
517-LX Manual de usuario   OFM 517-LX User Manual, 1 paginas
511-L Manual de usuario   OFM 511-L User Manual, 1 paginas
515-L Manual de usuario   OFM 515-L User Manual, 1 paginas
500-L Manual de usuario   OFM 500-L User Manual, 1 paginas
503-L Manual de usuario   OFM 503-L User Manual, 1 paginas
520-L Manual de usuario   OFM 520-L User Manual, 1 paginas
405-VAM Manual de usuario   OFM 405-VAM User Manual, 1 paginas
414-VAM Manual de usuario   OFM 414-VAM User Manual, 1 paginas
1005 Manual de usuario   OFM 1005 User Manual, 1 paginas
414C-VAM Manual de usuario   OFM 414C-VAM User Manual, 1 paginas
408-VAM Manual de usuario   OFM 408-VAM User Manual, 1 paginas
333 Manual de usuario   OFM 333 User Manual, 1 paginas
334 Manual de usuario   OFM 334 User Manual, 1 paginas
822 Manual de usuario   OFM 822 User Manual, 1 paginas
821 Manual de usuario   OFM 821 User Manual, 1 paginas
310-VAM-A Manual de usuario   OFM 310-VAM-A User Manual, 1 paginas
310-FA Manual de usuario   OFM 310-FA User Manual, 1 paginas