Thursday, November 25, 2010

Dish antenna

An antenna is a transducer that transmits or receives electromagnetic waves. In other words you can say antenna converts, electromagnetic radiation into electrical current. In order to minimize the losses in cable, LNB in front of dish antenna is connected that receives the microwave signals and changes the signal in to lower frequency Range. Then the signals are delivered to a signal splitter, commonly known as power divider that divides the signal in to independent path. Then the RF signals are picked by IRD  and transmit into digital information after then the signals are fed into the modulator Converts the signals into the channels and then the RF combiner, combines the multiple signals into one output signal which is then amplified by using RF amplifier and transmitted to trunk lines to homes. In homes a local station antenna is also used at the top of the roof to receive the signals. At the end you can say, antenna generally deals in the transmission and reception of radio waves. Antennas are used in systems such as radio and television broadcasting. Eb-ce provides you apical telecom consulting antennas.

LNB (low –noise block)


LNB stands for low noise block. It is device on the front of a satellite dish that receives the low level micro-wave signals from the satellite then amplifies and changes the signal to a lower frequency and sends them to a cable. In order to minimize the losses in coaxial cable that carry dish antenna signals to control room, the frequency are first translated to a lower frequency range. This is done by using LNB. LNB is connected at the front of dish, LNB receives the low level micro-wave signals from the satellite and amplifies it, changes the signal to a lower frequency and sends the signal to cable. Satellite broadcast mainly in the range 4 to 21 GHZ.
The extra LNB is also added in a single system satellite dishes in order to receive programmes from additional satellites. Eb-Ce   provides apical telecom consulting LNB.