The L-Band SAR instrument was the primary payload onboard SeaSat. It was the first spaceborne SAR sensor used for scientific purposes. The SAR instrument collected imagery with a ground resolution of 25 m x 25 m and a swath width of 100 km, at a wavelength of 23.5 cm and a frequency of 1.275 GHz. The received radar echoes were downlinked in S-band (analog data link at 2.265 GHz) in real-time, to a total of five ground receiving stations located at: Goldstone, CA, Fairbanks, AK, Merrit Island, FL, Shoe Cove, Newfoundland, and Oakhanger, UK. No high-rate onboard recording capability of SAR data was available at the time.
Imagine microwave radar
Microwave: 1.275 GHz, L-band, HH polarisation