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  • Radio Systems
    • Genesis & Evolution of Radio
    • Radio Signal Modulation Principles
    • Elements of Amateur Radio Station
      • Radio Communication Microphones
      • Radio Transceiver S-Meter – Pitfalls to avoid
    • Geodesy for Terrestrial HF Radio
      • The Great Circle Map – GCM
      • Antenna Bearings – Geodesic Map
    • International Radio standards
    • Radio Communication Architecture
    • Ham Radio Operating Procedures
  • Antenna
    • Antenna Fundamentals
      • Principles of Radiation
    • Omnidirectional Antennas
    • Wire Antennas
      • The Ubiquitous Dipole Antenna
      • Inverted V Antenna – A popular Dipole variant
      • Multiband End-fed Half-wave EFHW Antenna
    • Yagi Antennas
    • Cubical Quads & Delta Loops
    • Log Periodic Dipole Array (LPDA)
    • Stacked Antenna Arrays
    • Miscellaneous Antennas
  • Propagation
    • Fundamentals of Radio Propagation
    • VHF/UHF & Free Space propagation
      • Atmospheric impact on VHF Radio Propagation
      • Terrestrial VHF Radio Signal Coverage – LOS
      • Terrestrial VHF Radio Signal Coverage – BLOS
      • VHF Propagation Path Profiler
    • Ground Wave Propagation
      • HF Surface Wave Propagation (Ground Wave)
    • Solar Activity and Ionosphere
      • SSN, SFI, Solar Data for HF Propagation
    • Ionospheric Skywave Propagation
    • Noise in Radio communication
    • Radio Propagation Forecasting
    • Space Radio Propagation
  • Radio Rigs
    • Communication Receivers
    • Radio Transmitters
    • RF Power Amplifiers
    • Transceiver Architecture
    • Peripheral Equipment
    • Power Supply Units
    • SDR – Software Defined Radio
    • Repeaters & Transponders
    • DSP – Digital signal processing
    • Tuning and Operating Rigs
    • Home-brewing & Construction
  • RF Testing
    • Fundamentals of Measurement
    • Test & Measuring Instruments
    • Radio Equipment Test Parameters
    • RF Transmission Lines
    • Radio Receiver Measurements
    • Radio Transmitter Measurements
    • Antenna System Measurements
  • HamSphere 4
    • HamSphere 4.0 Architecture
    • Modular Transceiver Design
    • NEC Compliant Virtual antennas
    • Logbook, eQSL and Award System
    • India DX Net – (on HamSphere)
    • HamSphere Knowledgebase & FAQ
  • CW & Digital
    • CW – The most Robust mode
      • Learn CW Morse Code – Get Started
      • Learn CW Morse Code – Lesson Set 1
      • Learn CW Morse Code – Lesson Set 2
    • Slow Scan TV (SSTV) – How it works
    • Digital Modulation Fundamentals
    • Data & Text Mode digital Radio
    • Digital Radio – D-STAR DMR C4FM/YSR
    • Spread Spectrum (DSSS & FHSS)
    • FDMA, TDMA and CDMA Basics
  • Space Radio
    • Earth Satellite Orbits
    • Amateur Satellite Communications
    • EME Moonbounce communication
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