Signal level measuring apparatus

Details Signal level measuring apparatus Signal level measuring apparatus

H - Electricity

04

B

H04B 17/02 (2006.01) H01Q 1/12 (2006.01) H04B 7/19 (2006.01)

Patent

CA 2153181

A signal level measuring apparatus which measures a level of a satellite signal from a geostationary satellite as received by a receiving antenna and provides an output to determine whether the antenna is correctly directed toward the satellite. The apparatus is disposed between a converter associated with the antenna for converting the satellite signal into an IF signal and a tuner for demodulating the IF signal. The apparatus includes distributing means for divid- ing the IF signal from an input terminal of the apparatus into two output signals. One of the output signals is coupled to an output terminal of the apparatus, which, in turn, is coupled to the tuner. The other output signal is applied to level detecting means. An output from the level detecting means is compared in comparing means with a reference signal. Depending on the comparison output, the state of light- emission of a light-emitting device varies.

L'invention est un appareil de mesure de niveaux de signal qui est utilisé pour mesurer le niveau du signal transmis par un satellite géostationnaire et reçu par une antenne réceptrice, et dont le signal de sortie permet de déterminer si cette antenne est correctement orientée vers le satellite. Cet appareil est monté entre un convertisseur associé à l'antenne qui est utilisé pour convertir le signal provenant du satellite en un signal FI, et un syntoniseur servant à démoduler ce signal FI. Il comprend un dispositif de distribution servant à répartir le signal FI en deux signaux de sortie. L'un de ces signaux de sortie est transmis au syntoniseur par l'une des sorties de l'appareil. L'autre est transmis au dispositif de détection de niveaux. Le signal de sortie de ce dispositif est comparé avec un signal de référence dans un comparateur. L'état d'émission de lumière d'un dispositif luminescent varie selon le résultat de cette comparaison.

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