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Troubleshooting & Repair

Troubleshooting & Repair. RFI Causes. R adio F requency I nterference. Fundamental overload – clean, but very strong signals Harmonics Spurious Emissions. Curing your neighbor’s RFI. First, make sure your station is operating properly If TVI – is your own TV receiving interference?

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Troubleshooting & Repair

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  1. Troubleshooting & Repair

  2. RFI Causes Radio Frequency Interference • Fundamental overload – clean, but very strong signals • Harmonics • Spurious Emissions

  3. Curing your neighbor’s RFI • First, make sure your station is operating properly • If TVI – is your own TV receiving interference? • Ideal next step is to identify nature of “aggressor” and “victim” – f, location, etc. • Telephone – acts as radio receiver –add RF filter at telephone • RF filters – Snap-on ferrite chokes; Lowpass, Highpass, Bandpass, &Band-reject filters

  4. If your neighbor’s Part 15 devices interfere with you • Work to identify offending device • Politely inform him that rules require him to stop usage if RFI occurs • Apply fixes at your station if practical

  5. “Distorted or Noisy Audio” • Off frequency • Low batteries • Bad location • Hold radio “straight up”

  6. “Garbled or Unintellegible Transmissions” • RF Feedback • FM: Over-deviation – talk farther away or, Under-deviation – speak up! • Noise or whine on mobile unit: interference from vehicle’s electrical system

  7. Multimeter or DMM • Voltage: Voltmeter - connect in parallel • Current: Ammeter – connect in series • Resistance: Ohmmeter – unpowered target • Capacitor with Ohmmeter – reads low, then high

  8. Soldering • Use Rosin-core solder • Use correct size iron and tip • Be able to see joint clearly • Apply heat to terminal, apply solder to terminal

  9. Soldering tools

  10. Bad Solder Joint (Cold Joint) Photo http://www.aaroncake.net/

  11. Bad Solder Joint (Cold Joint) Photo: Wikipedia

  12. Broken and Good Joints Photo: Wikipedia

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