 The circuitry used was called the "Green Machine".It employed the fast Fourier transform which can increase the decoding speed by a factor of three.Since the 1990s use of this code by space programs has more or less ceased, and the NASA Deep Space Network does not support this error correction scheme for its dishes that are greater than 26 m.

While all Hadamard codes are based on Hadamard matrices, the constructions differ in subtle ways for different scientific fields, authors, and uses.