PPT-Lecture 3 Radio Propagation

Simplified model of a digital communication system 2 Source Source Encoder Channel Encoder Modulator Destination Source Decoder Channel Decoder Demod ulator Radio Channel Components of the digital communication system. 1 Motivation We know that digital circuits are formed by two type of components 1 Combinational circuit and 2 Sequential Circuits Combinational circuit component s are used only for logic implementation and cant store the bits ie work as memory But Introduction. 1. Things we need to know. 2. CS 164 . Qualitative idea of telecommunication networks and protocols – the OSI stack. what TCP/IP is, etc.. Routing protocols. Broad overview of course contents. How to snag that DX!. Michael Smith, N5TGL. Agenda. Purpose. Three Magic words. Understanding . Propagation. Propagation modes. How . solar activity impacts the ionosphere. Learning . the numbers. A and K index, SFI, 304A, . The transmission medium is the physical path by which a message travels from sender to receiver.. Computers and telecommunication devices use signals to represent data.. These signals are transmitted from a device to another in the form of electromagnetic energy.. Announcements. 1. st. HW posted by tonight, due next Friday at . 4pm. .. Discussion section starts next week, W 4-5, Packard 364. TA OHs start next . week (Wed 5-6pm, Fri 10-11am (Milind), Thu . 4-5pm . Emmanuel Baccelli, Philippe Jacquet, Bernard Mans, and Georgios Rodolakis. Presented by: Mayank Shekhar. Contents. Information Propagation Speed. Significance. Dependency. Mathematical Model for Delay Tolerant Networks. REVISION FLASH CARDS . Natural. Veg. Prop. . 4 methods . Stem – runner (or stem tuber). Root- root tuber. Leaf – plantlets of Mother of Thousands. Bud – bulb . Modified . S. tem. Runner. Runner. Introduction. 1. Things we need to know. 2. CS 164 . Qualitative idea of telecommunication networks and protocols – the OSI stack. what TCP/IP is, etc.. Routing protocols. Broad overview of course contents. Adames. , A. F., J. M. Wallace, and J. M. Monteiro, 2016: Seasonality of the structure and propagation characteristics of the MJO. . J. Atmos. Sci.. , . 73. , 3511–3526.. Introduction. the convective centers in the MJO shift seasonally toward the summer hemisphere, following the belt of highest sea surface temperature (SST). . ARRL. : Ch. 4. G. West. Weak signal propagation . p. . 105. Antennas . p. . 175. Feed Me With Some Good Coax . p. . 183. The Sky Above. Ionosphere. Weather. 30 mi.. 260 mi. -ISS. 414 mi. Learn your D, E, F’s. A Constraint Propagation Perspective. Rina . Dechter. Bozhena. Bidyuk. Robert. Mateescu. Emma. Rollon. Distributed Belief Propagation. Distributed Belief Propagation. 1. 2. 3. 4. 4. 3. 2. 1. 5. 5. 5. Jansky returns to star noise in 1937. The Discovery of the Radio . Sky 1932. 3. Cycle 16. 4. Challenges post 1934. Sunspot Cycle 17. Diathermy machines. Lack of interest by astronomers. AT&T focus on HF circuit fading. To clear up common . misconceptions. about plant propagation and . inspire . you to try. . it.. Provide . information. and . resources. from personal . experience. .. Plant propagation. will . always challenge you, but it doesn’t . Frequency . Radio . Communications and ALE. 2018 ORWG . Wing Conference. Lt Col David Rudawitz. ORWG Director of Communications. Introduction to HF Communications. Introduction to HF Communications. HF (High Frequency) is the radio spectrum with frequencies ranging between 1.6 MHz and 30MHz. Within this radio spectrum an efficient mode of transmitter modulation, SSB (Single Side Band), is used..