NASA TV (Public, HD, Media, and Education channels) is now available in continental North America, Alaska and Hawaii on AMC-18C. A Digital Video Broadcast (DVB) compliant Integrated Receiver Decoder (IRD) is needed for reception. NASA Television's Public, HD, Media and Education channels are available at these parameters:

Uplink provider = AMC 18 C 
Transponder = 3 C
105 degrees W
C-Band 
Downlink Frequency: 3760 MHz
Downlink Polarity: Vertical
Transmission Format = DVB-S, 4:2:0
FEC = ¾
Data Rate = 38.80 Mbps
Symbol Rate = 28.0681
Modulation: QPSK/DVB-S
MPEG-2 encoding

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Live video from the International Space Station includes internal views when the crew is on-duty and Earth views at other times. The video is accompanied by audio of conversations between the crew and Mission Control. This video is only available when the space station is in contact with the ground. During "loss of signal" periods, viewers may see a test pattern or a graphical world map that depicts the station’s location in orbit above the Earth. Since the station orbits the Earth once every 90 minutes, it experiences a sunrise or a sunset about every 45 minutes. When the station is in darkness, external camera video may appear black, but can sometimes provide spectacular views of lightning or city lights below.

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