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Radio Frequency Interference Troubleshooting and Repair Guide

Learn how to identify, troubleshoot, and fix radio frequency interference (RFI) issues, including tips for dealing with neighbor's RFI and common problems like distorted audio and garbled transmissions.

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Radio Frequency Interference Troubleshooting and Repair Guide

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Presentation Transcript

  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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