‫Now we come to the simplified block diagram of the articles, your article, SDR, is a quite famous
‫SDR that you can get for dollar twenty only.
‫And it is only used for reception.
‫It cannot be used for the transmission.
‫So the received signal is received at this antenna and afterwards it is passed to the low noise amplifier
‫and then it is passed to the filter.
‫Here we are using the filter because we only want to filter and juice.
‫These signals are the channels that we are interested in.
‫The rest of the frequencies are rejected using this filter.
‫So then this received signal is asked to the mixer.
‫And what mixer does is that currently this receives signal is at the carrier frequency.
‫This mixer changes the frequency of this signal to the intermediate frequency and afterwords.
‫And this signal, which is now at the intermediate frequency, it is asked through a filter with the
‫bandwidth of five megahertz.
‫So the bandwidth of the filter through which this signal is passing, it is five megahertz.
‫And after that, we amplify this signal, which is at the intermediate frequency.
‫You might ask the question that why we are amplifying this signal at the intermediate frequency.
‫The answer is that it is easier to design an amplifier that amplifies a specific frequency only.
‫So by designing an amplifier that is centered at the intermediate frequency, we can get very high amplification
‫because this amplifier is optimized for the intermediate frequency.
‫And after that, the signal is then digitize, use digitized using the analog to digital converter.
‫And then this digital signal needs to be demodulator.
‫That means that it needs to be brought to the zero frequency.
‫So this demobilization of this digitized signal is achieved using the eye and dequeue demodulator in
‫the idee modulator.
‫The received signal is multiplied by the cosine.
‫Asked for the low pass filter and then it is don't simper who reduce the sampling rate.
‫And hence here we get the ice hempel's which are given to the computer using the USP interface and in
‫the other branch we do the same thing.
‫But using the sign carrier to reduce the need to produce these new symbols and these GUE samples are
‫then given to the computer.
‫So this diagram is also similar to the SVR received diagrams that we started earlier, except that it
‫has an additional.
‫Intermediate frequency stage or the amplification?