"Is anyone else here familiar with notched noise IMD measurements?? I only used them a few times in the 80's, so my recall is limited."
Tom - This is the way we used to measure our analg FM and SSB microwave radios at Collins/Rockwell. A broadband noise source with a very high-Q notch filter was injected into the transmitter baseband input. We had notch filters at low, mid- and high baseband frequencies, though the highest baseband frequency was always the worst. However, we were using pre- and de-emphasis to compensate the baseband signal. We looked at total noise (normal KTB plus IMD) in the received channen associated with the notches. Since we knew the KTB noise floor, we could then determine the IMD noise. Brings back memories. Phil - AD5X ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
