TECHNICAL VISIT TO SINHAGAD TV TRANSMITTER
We visited to Sinhagad TV transmitter on 4th February 2009. We are accompanied by Prof.B.G.Tarlekar and Prof. More.
At Sinhagad transmitter station broadcasting of DD1 & DD2 is done. They are related to UHF & VHF bands. There is receiver, transmitter & signal processing units for processing the signals according to the requirement of transmitting antenna. There are two main sections for transmission of visual & aural transmission.
At the Sinhagad TV transmitter the signal is received from the satellite then it is amplified at receiving antenna using LNBC.
Then it is given to the modulation processing unit. Processing unit then convert the received signal for transitions through transmitting antenna.
The signals are broadcasted over radius of around 80km to 120 km from TV transmitter.
The transmitter is the unit that transmits the visual and aural power. It contains modulator for long distance transmission because if baseband signal is transmitted over long distance, then it degrades in quality.
The DD1 transmitter at Sinhagad transmission station is called as ‘Valve Type Transmitter’. This transmitter is IF (Intermediate Frequency) transmitter. The transmitter specifications are given below.
1. No of channels : 2
2. DD-1 : Channel no: 5 at 175.25Mhz
3. DD-2 : Channel no: 29 at 235Mhz
4. Type of transmitter used : Valve type. (e.g.: 5A5 triode).
1. Input video voltage : 1 Vp-p
2. Output power : 10 KW
3. Output of VTPA : 10 W(Video Transistorized Power amplifier)
4. Output of IPA stage : 100 W
5. Output of VPA stage : 1 KW
6. Frequency range : one CCIR TV channel in Band 1 or 3
7. RF output connection :...