Relationships between rain and ice attenuation and depolarization at 19 GHz have been determined for linear incident polarizations ± 4 and\pm 8\degfrom vertical. These relationships are based on measurements made using beacon transmissions from a COMSTAR satellite. A technique is used to bound depolarization magnitude at any incident polarization from a depolarization magnitude measurement made at another polarization. This technique makes use of previous observations that depolarization is minimal at vertical and horizontal incident polarizations. The bounds are compared with the results from the COMSTAR measurements.

Cumulative attenuation distributions for one year and relationships between attenuations at 19 GHz and 28 GHz are presented for an earth-space propagation path terminating at Crawford Hill, New Jersey. An example from the distributions indicates that 20 dB attenuation was exceeded for 0.012% of the year at 19.04 GHz and for 0.06% at 28.56 GHz. For both frequencies the polarization was linear and oriented 21° from vertical at the receiver. When the attenuation at 19 GHz was less than 20 dB, the attenuation in dB at 28 GHz averaged 2.1 times that at 19 GHz. This ratio was lower at higher attenuations.

LINC is a technique that uses signal processing to produce Linear amplification of bandpass signals with grossly Nonlinear circuit Components. The important signal processing functions in LINC are forming two constant envelope phase modulated signal components from the bandpass input signal and recombining the amplified components to produce an amplified replica of the input signal. Two- and three-tone laboratory tests of a complete LINC amplifier show that, at full output, spurious levels 40 dB below tone level are achievable for tone spacings of 100 kHz. Because the laboratory model is operated at relatively low frequencies (hundreds of MHz), scaling up in frequency should result in a LINC with\sin^{-1}phase modulator that is less sensitive to delay in a feedback loop and a wider-bandwidth lower-distortion input limiter.

Distributions of delay spread and correlation bandwidth at 0.9 and 0.5 correlation for Gaussian wide-sense stationary uncorrelated scattering (GWSSUS) channels associated with 100 small-scale areas at different locations within a 2 × 2.5 km region of New York City are presented. For delay spread the maximum value observed was3\frac{1}{2};\mus and l0 percent of the areas exceeded2\frac{1}{2}\mus; for correlation bandwidth at 0.9 correlation the minimum was 20 kHz and 10 percent of the areas were less than 30 kHz; for correlation bandwidth at 0.5 correlation the minimum was 55 kHz and 10 percent of the areas were less than 130 kHz. The region is representative of the heavily built-up areas of many large cities in the United States.

LINC is a technique that uses signal processing to produce linear amplification of bandpass signals with grossly nonlinear circuit components. Two important signal-processing functions of LINC are 1) forming two constant envelope phase-modulated signal components from the bandpass input signal and 2) recombining the amplified components to produce an amplified replica of the input signal. Two-tone laboratory tests of a LINC component separator and combiner, not including a limiter and envelope detector, show that, at full output, spurious levels 40 dB below tone level are achievable over a 1-MHz band. Because the laboratory model operated at relatively low frequencies (hundreds of megahertz), scaling up in frequency should result in a LINC with-1phase modulator that is less sensitive to delay in a feedback loop.