Inside DXZoneBest Links of the Week Top Amateur Radio Websites – Issue 2204 A selection of best links, recently added to our amateur radio links directory By DXZone - Feb 13, 2022 418 Tulip SDR SP3OSJ SDR Project for a compact amateur radio software defined radio trasceiver covering HF bands all mode. Website includes schematics, element PCB, pictures, movies, firmware and elements bom. Dual Band Quarter Wave Droopy Antenna VA7DH Adapted from a similar project by NA4IT. Made with one quarter wave 2 meter radiating element pointing upward and it is surrounded by four 70 cm elements. Cushcraft R7000 Prob/Repair VE3EK Repairing a Cushcraft R7000 antenna featuring several problems, mostly concerning coils and the insulating parts of the antenna. 13cm Bi-Quad Antenna VK1AD A homebrew 2.4 GHz bi-quad antenna for SOTA. Includes several pictures about assembling parts, a list of material and dimensions. Signal to Noise Ratio SNR KF6HI Signal to Noise Ratio, definition and application to Radio Communications. Signal to Noise Ratio (SNR) is a figure of merit that compares the level of a desired signal to the level of background noise.