Special Issues at Low frequencies: Interferences(ctd.)
		• Strong interferences: may be the main challenge: – Power of TV is 80 db above quiet sun emission at 200 MHz (Nançay) • A stop band filter may be required for each strong emitter • The power is very high in the wide band electronic • Very high dynamic components are needed in order to avoid intermodulation (which can generate thousands of parasitic lines) • That level may be to high for digital filtering and interference excision. • Site quality is very important.