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ARRL ARIA Update

ARRL ARIA Update. Status as of June 2002. ARIA Overview. To determine the noise and signal levels on amateur bands at 70 cm and above. The initial focus is on the 2.4 GHz amateur allocation. A group of volunteers has been identified to make the necessary tests and measurements.

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ARRL ARIA Update

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  1. ARRL ARIA Update Status as of June 2002

  2. ARIA Overview • To determine the noise and signal levels on amateur bands at 70 cm and above. • The initial focus is on the 2.4 GHz amateur allocation. • A group of volunteers has been identified to make the necessary tests and measurements.

  3. ARIA Drive-Around Tests • Participants go to various unspecified locations. • Relative determinations of what signals (narrowband and broadband) and noise levels are found at these locations. • Reported on a standardized form. • Volunteers have started doing some of the drive-around tests.

  4. The next phase of the study • Measurements of signal and noise levels. • ARRL has designed calibrated amplified broadband noise sources. • Used to radiate a signal of a known field strength, which is then used to calibrate a test fixture consisting of an antenna and receiver. This is then used to measure the field strength of a given signal or noise. • ARRL has also written a calibration procedure for using the noise source to make accurate measurements.

  5. Some preliminary results Santa Clara Valley, CA 2400-2410 MHz downconverted to 144-154 MHz

  6. Comments from 2.4 GHz Amateur Radio Users • “Out here in the Bay Area, any 2.4 ham repeaters that existed in the shared spectrum have already been moved because the spectrum is full of trash.” • “The noise floor is so high as to be unusable.” • “Illegal amplifiers are easily available for 2.4 wireless data, and deployed with impunity.” • “Performance of our Amateur Television station on 2.4Ghz located on Black Mountain has also suffered tremendously from this interference. Its output frequency is around 2427 MHz.” • “2.4 is the next 11 meters, illegal amps and all.”

  7. Uncalibrated measurements in my hotel room last night

  8. Uncalibrated measurements made in this room now

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