RFI Monitor Station Spectra, January 29, 2002

Rick Fisher, NRAO, Green Bank, WV

Contents

The following spectra are comparisons of the RFI environment seen from the RFI monitor station just beyond the 45-foot antenna. Each 40 MHz frequency range has two plots, the first with the log-periodic antenna pointed toward the lab building (azimuth = 141 degrees) and the second with the lab building in a 15 dB null of the antenna pattern (antenna azimuth = 210 degrees). The spectra are one-minute integrations with the spectral processor. The frequency resolution is 40 kHz. The top plot is the total power noise spectrum, and the bottom plot is the same data convolved with a [-0.5, 1.0, -0.5] three-point function and multiplied by a factor of 20 to emphasize narrowband features.

295 - 335 MHz, Az = 141 degrees

Figure 1. Antenna pointed toward lab

295 - 335 MHz, Az = 210 degrees

Figure 2. Antenna pointed away from lab

320 - 360 MHz, Az = 141 degrees

Figure 3. Antenna pointed toward lab

320 - 360 MHz, Az = 210 degrees

Figure 4. Antenna pointed away from lab

355 - 395 MHz, Az = 141 degrees

Figure 5. Antenna pointed toward lab

355 - 395 MHz, Az = 210 degrees

Figure 6. Antenna pointed away from lab

390 - 430 MHz, Az = 141 degrees

Figure 7. Antenna pointed toward lab

390 - 430 MHz, Az = 210 degrees

Figure 8. Antenna pointed away from lab

425 - 465 MHz, Az = 141 degrees

Figure 9. Antenna pointed toward lab

425 - 465 MHz, Az = 210 degrees

Figure 10. Antenna pointed away from lab

460 - 500 MHz, Az = 141 degrees

Figure 11. Antenna pointed toward lab

460 - 500 MHz, Az = 210 degrees

Figure 12. Antenna pointed away from lab

320 - 360 MHz, Azimuth sweep

Figure 13. Antenna swept from 0 to 360 degrees in azimuth for 320-360 MHzfrequency range.

440 - 480 MHz, Azimuth sweep

Figure 14. Antenna swept from 0 to 360 degrees in azimuth for 440-480 MHzfrequency range.

Last modified February 20, 2002

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