Propagation constant a conductor. The skin effect causes R along the conductor to be approximately dependent on frequency according to Losses in the dielectric depend on the loss tangent (tan "δ") of the material divided by the wavelength of the signal. Thus they are directly proportional to the frequency. The attenuation constant for a particular propagation mode in an optical fiber is the real part of the axial propagation constant. In electromagnetic theory, the phase constant, also called phase change constant, parameter or coefficient is the imaginary component of the propagation constant for a plane wave. It represents the change in phase
The Crests Jarmels. Former Jarmels member Ray Orta was also called in as a fill-in replacement for Joe Rivera. On December 12, 2017, J.T. Carter's Crests performed at The Paramount Theatre in Asbury Park, New Jersey, along with over 40 other groups from the 1950s and '60s, as part of TJ Lubinsky's new PBS TV Special, "Doo Wop Generations" (part of the "My Music" series). The special aired nationally in the US on PBS on March 3, 2018. The group was featured singing "The Angels Listened In" on the PBS television broadcast, as well as "Step By Step" listed on the CD/DVD