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IMD 101: Finding, Solving and Preventing Inter-modulation Interference Problems

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Multi-Carrier Rooftop SiteEver since the days of Marconi and spark gap radio the wireless radio equipment has been plagued by radio interference (RFI). In the early days before the radio channels were congested, you still had to put up with noise from thunderstorms, errant transmitters, lousy receivers, and primitive equipment.

Multi-Carrier Mountain Top SiteIn today’s modern technology, there are the same problems from yesteryear, along with crowded channels, crowded radio sites, and everything today seems to be powered by batteries and radiates wireless electrical energy. Often RFI is not even recognized as a problem that may be seriously affecting a given communications system.

Inter-modulation products are the emissions at frequencies generated by the combination of two or more frequencies in a non-linear device, such as the output stage of a transmitter, or the input stage of a receiver. This course will discuss all of the common types of interference, their causes, common and uncommon cures, prevention of interference, and how to measure for interference or the lack of it as well as taking the student through the ways IMD exists their site. IMD 101 can be held live at your location or a shorter class can be taken online.

 

Finding, Solving and Preventing Inter-modulation Interference Problems

Some Topics Covered in IMD 101:

  •  Symptoms of Intermodulation Products

  •   Types and Sources of Intermodulation Products

  •   Harmonic Relation Ships

  •   Definitions of Terms

  •   Software Intermod Tools for Analysis

  •  Special Equipment to be Used

  •   Antenna Types and Their Use in Analysis

  •  Transmitter Intermod

  •  Receiver Intermod

  •  External and Galvanic Intermod

  •  Distance Attenuation, Horizontal and Vertical Antenna  Patterns and Their Applications

  •  On and Off Site Interference/IMD Direction Finding

  •  Case Studies and Their Analysis

  •  High Power Noise Sources and System Egress

  •  Preventive Hardware, Cavities, Isolators/Circulators,  Duplexers, Diplexers and Multicouplers

  •  Coax Isolation Factors

  •  Receiver Desensitization and Noise Floor Additions

  •  Site Etiquette

Equipment Area

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Equipment Area

Passing this course does not in any way authorize attendee to present themselves as a RSI authorized trainer nor does it give attendee authority to utilize the RSI name or likeness in any form including advertising, training, or development. Only by passing the RSI Advanced Train the Trainer course, requesting RSI to furnish official RSI training cards, and paying the required fee per card, is an attendee allowed to provide their internal employees with training cards that contain RSI information. RSI Advanced Train the Trainer graduates are only authorized to issue cards to persons that are direct hires for their company that has paid for the training. These policies will be strictly enforced including taking legal action to protect the RSI name and material.