4TH Oct, 2011: An Industrial visit to Doordarshan (HPT) .

This visit was arranged for SY ETC students from B.Tech. Total 65 students visited to HPT place with coordinator Mr. V.R Gosavi (Asst. Prof. ETC) along with Ms. Suchita Saraf. This visit was part of their syllabus for subject Principles of Communication Engineering.

The exact communication process as RF (Radio Frequency) signals reception to dish through satellite from Mumbai and Delhi, and then are reflected at the LNCB (Low Noise Block Convertor) and are converted from GHz to MHz are explained.

The Frequency of the signals is 196.25 and V Output is 9.7KW and A Output is 558KW. The video displayed is in CCV (Colour Composite Video) form and Colour Bust is 0.3. The Engineer explained to all students the concept of Blower Room where there were 2 blowers in order to cool the Power Amplifiers. The reason for two blowers was, if in case one stops working or has some fault in it, it should automatically switch to the next blower to avoid any damage to the Amplifiers and other setup.

Then the processed audio and video signals from the control room are sent to the tower in copper tubes. Copper tubes are used in order to avoid leakage. The tower was 500 meters tall. In which uppermost 125 meter was the Antenna. The processed RF audio and video signals are sent to the antenna through the tower in copper tube. Thus the signals are transmitted from the tower antenna to our personal antennas and hence we are able to watch Doordarshan on our television sets.

Photos