Two-frequency radiowave propagation measurements in Brooklyn

Time delay spread and signal level measurements were made in the streets of a dense urban area in Brooklyn, New York at 850 MHz and 1.9 GHz. The maximum root mean square (rms) time delay spread observed was 243 nanoseconds (ns). However, this dropped to under 110 ns for radii under 75 meters. When both the transmitter and receiver were on the same road, received power levels followed a two-path model, together with about 0.03 to 0.003 dB/m additional attenuation, depending on the street