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Chelmsford Amateur Radio Society Foundation Course Nature of Amateur Radio

Chelmsford Amateur Radio Society Foundation Course Nature of Amateur Radio. Amateur Radio. Nature Amateur Radio is for self-training and experimentation, and is non-commercial in nature Benefits Amateur Radio is of value in areas of Technical Innovation Emergency Communications

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Chelmsford Amateur Radio Society Foundation Course Nature of Amateur Radio

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  1. Chelmsford Amateur Radio Society Foundation CourseNature of Amateur Radio

  2. Amateur Radio • Nature Amateur Radio is for self-training and experimentation, and is non-commercial in nature • Benefits Amateur Radio is of value in areas of • Technical Innovation • Emergency Communications • Development of Skills • International Friendship • Recreational Activity • The Foundation Licence is the entry level to Amateur Radio in the UK

  3. Amateur Radio Aspects • BANDS HF, VHF, UHF (and Microwave) • SPECIAL Repeaters, Internet Links, Packet/UIView, DX Cluster, RAYNET and Satellites/ISS • MODES Voice, Morse, Data/Telemetry, SlowScan Images/TV • MODULATION CW, AM, SSB, FM, FSK, PSK31 etc • OTHER RSGB/Radcom, Clubs/Events, QSL Cards, Rallies Contests, Awards

  4. Radio Microwaves THz IR UV X-rays Gamma rays Understand the Terminology for the Radio Spectrum

  5. Frequency & Wavelength • As Frequency increases its Wavelength shrinks • Antenna sizes are proportional to wavelength • So higher frequencies have smaller antennas • For Foundation use, a conversion chart is available to avoid the arithmetic – its in the exam handout – so do use it!

  6. Amateurs then voluntarily agree how to use each band via band plans, which are coordinated by RSGB/IARU Regulators such as Ofcom allocate specific bands to Amateurs in the Licence Frequency Schedule Our Frequencies

  7. Frequency Ranges • Remember common ranges for Radio Frequencies (RF):- • HF: 3-30MHz • VHF: 30-300MHz • UHF: >300MHz • Compare with UK AC Mains = 50Hz • General Audio (AF) for Normal Hearing: 100Hz-15kHz • Frequencies for Audio Communications: 300Hz-3kHz

  8. Frequency Bands • Amateurs often refer to their bands in terms of either wavelength or frequency • Try to familiarise how bands may be described • HF: 7MHz = 40m 10MHz = 30m 29MHz = 10m • VHF: 50MHz = 6m 145MHz = 2m • UHF: 430MHz = 70cms • Note how the wavelengths decrease as frequencies rise - as per the earlier slide and the conversion chart

  9. Other Radio Users • The radio spectrum is divided into agreed allocations to coordinate various uses • The table opposite is a VHF example and may be used in the exam • Amateurs have to share radio spectrum with many other services • Other services may be in adjacent bands, but sometimes may be within an Amateur band

  10. Useful Information ! • The handout has copies of the schedule, band plans, frequency usage and the conversion chart • Take care to review it • Do ask if you don’t understand • Remember that it can give you some answers in the exam - so do use it !!!

  11. Handhelds Data / Packet Satellites & ISS Contests TV Mobile Repeaters /Gateways Microwave Amateur Radio at Large

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