RFI Management for Single Dish Radio Astronomy at NRAO Green Bank. Some Considerations. Single dish RA is more vulnerable to RFI than array configurations. Protection and source-mitigation are the preferred options but not always possible.
RFI Management for Single Dish Radio Astronomy at NRAO Green Bank
Assessing Equipment For RFI ComplianceAnechoic Chamber Testing
Receive (Rx) Antenna
Equipment Under Test (EUT)
PowerTx(dBm) = Pmeasured(dBm) + Lspace(dB) – Gantenna(dB) – Gamplifier(dB) + Lcables(dB)
~3:1 or 5dB SNRatio
…but anechoic chamber prediction said worst-case emissions exceed ITU-R line limit by 22dB....17dB discrepancy????
60s integration time of test vs. ITU-R line limitassumed 2000s integration:
10Log(60/2000) = -15dB (close enough)