National Weather Service United States Department of Commerce

Heavy Rain in the Mid-Atlantic; Severe Thunderstorms in the Northern Plains; Critical Fire in the West

Locally heavy rain and flash flooding will be possible today into tonight near the Mid-Atlantic/Carolina coast. Storms with large hail and severe wind gusts are expected across parts of the central and northern Plains into the upper Mississippi Valley. Dry thunderstorms, and warm, dry, and windy conditions will produce fire weather conditions in parts of the Great Basin and northern Rockies. Read More >

Sources for HRIT/EMWIN systems and components:

  • Some LRIT receiver manufacturers are offering HRIT/EMWIN receivers.
  • EMWIN system modifications may provides an alternative to replacing an entire system. Information on the fabrication of Intermediate Frequency (IF) and Radio Frequency (RF) digitizer boards, and use of software radios may be found online.

US Government auction of L-band frequency spectrum (1695 to 1710 MHz) adjacent to GOES-R HRIT/EMWIN transponder frequency is likely to adversely impact the reliability of HRIT/EMWIN signal reception in the US due to cell phone interference.

HRIT/EMWIN Downlink Characteristics (NESDIS-2)

Coding – BPSK

  • Convolutional rate ½ code with constraint length 7 concatenated with Reed Solomon (255,223) with Interleave = 4
  • Square Root Raised Cosine filtering using an Alpha factor of 0.3
  • The resulting “Necessary Bandwidth” for this signal will be 1.205 MHz

Modem Required: predicted C/No is in the range of 63-67 dB
Maximum Demodulator Required is -

  • Eb/No is 4.6 dB for a BER of 1x10-8 after decoding

Minimum Antenna System

  • At 5 degree elevation, the minimum antenna is 1.2 meter.
  • At 10 degrees or more elevation the minimum size is 1.0 meter
  • Using a LNA or LNB with a system noise temperature of about 200 K will provide a G/T of 1.0 dB/K or -0.3 dB/K respectively