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Coaxial Cable for Amateur Radio Communications

Introduction. What is amateur radio?Amateur or ?ham' radio is regulated and licensed by the FCC Creation was the U.S. would have knowledgeable communications personnel in times of need, such as natural disasters and other public servicesAlso to encourage the spirit of invention and goodwill with

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Coaxial Cable for Amateur Radio Communications

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    1. Coaxial Cable for Amateur Radio Communications Jennifer Johnson, KC0IEN

    2. Introduction What is amateur radio? Amateur or ham radio is regulated and licensed by the FCC Creation was the U.S. would have knowledgeable communications personnel in times of need, such as natural disasters and other public services Also to encourage the spirit of invention and goodwill with other countries and other people Hams operate on any and all modes of communications on a wide variety of frequencies

    3. Introduction to project Recently, I helped the Cyclone Amateur Radio Club (CARC) complete an installation of coax for its club station or shack in Friley Hall Removed old (~20 year old) coax and replacing with new and expensive coaxial cable Previous runs were probably RG-8 or RG-8 variants CARC analyzed what kind of cable to purchase and for what purposes

    4. Criteria for Coax purchase Types of communications to be used RTTY, PSK31 (data), SSB, AM, FM, CW (Morse code), satellites, etc. Power output 5 mW to 800 W Frequencies to be used HF 1.8 MHz to 30 MHz VHF 30 300 MHz UHF 300 MHz 3 GHz Ease of installation Coax must be flexible to bend around corners to get to roof Length of cable required Low SWR needed for the ~100 ft of coax needed to reach antennas from shack

    5. Background Information Antennas on Friley are HF and VHF beams and dipole antennas CARC has a 1.2GHz module for a Kenwood TS790 Installation of 1.2GHz antenna for satellite work is planned for a future date Picking coax for HF/VHF antennas was easy There is an inherent low loss for HF frequencies, since the conductor resistance is related to skin effect and also because dielectric losses rise with frequency. Conclusion dont waste money buying low SWR cable Picking coax for UHF somewhat easy, but more expensive Attenuation is the sum of the conductor properties times the square root of the frequency plus the dielectric properties times the frequency. As the signal frequency is increased, the attenuation component contributed by dielectric will increase faster than the attenuation component contributed by conductors. It is for this reason that it is important to use the highest quality of dielectric materials available to optimize performance at high frequencies. Conclusion Buy the best quality cable you can LMR series is a good choice

    6. Coax Comparison

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