Doordarshan is now available on YouTube. URL for Doordrarshan is www.youtube.com/DoordarshanNational
Earth Station




Doordarshan Kendra Delhi has (8+1)-SD and (1+1)-HD uplink Digital Earth station. This earth station uplink the programmes at C-band to INSAT- 4B satellite on MCPC scheme. The Satellite 4-B was launched in March 2007 by the European Ariane launch vehicle. Configured with payloads identical to that of INSAT-4A, INSAT-4B carries 12 Ku-band and 12 C-band transponders to provide EIRP of 52 dBW and 39 dBW respectively. It is co-located with INSAT-3A at 93.5 degree E-longitude.

The Digital earth station’s C-Band Uplink Frequency is 5.85 to 6.425 GHz and Downlink Frequency is 3.4 to 4.2 GHz. The uplink channels on (8+1)-SD are DD-National , DD-Urdu, DD-Bharati, DD-India, DD-Sports, DD-Rajya Sabha, DD-Feed, and DD-News. The Digital earth station is also unlinking the HD programme on (1+1) i.e.DD-HD.

Up converter:
It converts the 70 MHz (or 140 MHz) signal from the 50 Ohms N-type connector to L band (950-1450 MHz). Double conversion is employed in this up converter using a fixed LO of 900 MHz (970 for 140 MHZ IF input) and an agile LO tuneable from 1789 MHz to 2280 MHz. There is a variable digital attenuator in the up conversion path for control the gain. The gain is automatically controlled for compensating temperature effects.

Down converter:
The down converter module takes in the L Band signal (950-1700 MHz) from the LNB and down converts to 70 MHz ( or 140 MHz). Double conversions employed with the fixed LO at 900 MHz ( or 970 MHz) and agile LO at 1780MHz to 2530 MHz. The gain can be varied easily in steps of 1dB over a 20 dB range using front panel The front panel also allows the frequency to be changed in steps of 1 MHz and also choose the receive frequency bands.
The satellite receiver is fully compliant with the appropriate sections of the MPEG-21, DVB-S2 and DSNG3 specifications.
L-band Satellite Receivers have two inputs (either QPSK or BPSK,QPSK, 8PSK and 6QAM)

Video Decoding:
4:2:0 mode support video resolutions up to 720 pixels x 576 active lines ( 25 frame/s ) or 720 pixels x 480 active lines ( 30 frame/s )
4:2:2 mode support video resolutions up to 720 pixels x 608 active lines ( 25 frame/s ) or 720 pixels x 512 active lines ( 30 frame/s )
Support for PAL- I, B, G, D, PAL- N, PAL- M, and NTSC-M (with pedestal or without) composite video output via two 75 Ω BNC connectors.

Audio Decoding:
Sampling rates 32, 44.1, 48 kHz. All MPEG-1 data rates.
All Dolby Digital AC-3 data rates, decoded as a Dolby Stereo downmix. Linear uncompressed audio, data rates as defined by SMPTE 302M.

For detail information of DD Direct+ DTH go to the link: Click Here