SPEKTRA Volume 7 issue 1 contains five papers: 1) Study of Crustal Structure of The Flores Island Using Receiver Function Method, 2) Characterization of (Mg_0.6Zn_0.4)TiO₃ Ceramics as Dielectric Resonator Materials in Microwave Frequencies, 3) Identification of Soil Corrosion Potential for Planning in The Gas Pipeline Cathodic Protection System, 4) The Effect of Variation Concentration and Deposition Parameter to The Optical Characteristics and The Crystallite Properties of Zinc Oxide, and 5) The Analysis of Sound Transmission Loss on Laminated Glass.