| 摘要 |
FIELD: radio engineering; digital data transfer in short-wave radio station. ^ SUBSTANCE: novelty is that prior-art parallel short-wave modem having modulator and demodulator is provided with N amplitude keyers newly introduced in modulator, as well as p narrow-band filters, p 90 deg. phase shifters, where p is number of pilot signals in group signal, p amplitude detectors, p reset integrators, and mp quadrature single side-band converters, in demodulator. ^ EFFECT: ability of retaining serviceable condition of modem on occurrence of fast fading. ^ 1 cl, 13 dwg |
