Guys, AM Broadcasting isn't your grandmother's AM radio of old. Many years ago, along came NRSC and it's 10kHz brick-wall filter & modified preemphsis. NRSC recommendations do not include a requirement for the audio be flat to the limits of the filter but encourage the broadcaster to use the bandpass that is necessary for the program material - Best Engineering Practices. Possibly limiting the audio to 5 kHz or even lower for voice only programming (talk radio). The FCC has adopted the NRSC specifications for the audio chain; but retained the occupied RF bandpass requirements.
I'm fully confident that Elecraft could create a mode that complies with the NRSC's recommend AM receiver practices to include limiting the bandpass, premphsis & the 10 kHz notch filter curves. Those of us that do not use an Elecraft transceiver for AM Broadcast can probably find other firmware features that we would like to have higher on the software enhancement list. 73 George AI4VZ -----Original Message----- From: Matt VK2RQ wrote: This is quite true Don, however it should also be noted that the design parameters of interest to this discussion largely lie in software, which provides considerable flexibility in meeting the goals of both ham band and general coverage reception. This is of course one of the big advantages of adopting a Software Defined Radio architecture. 73, Matt VK2RQ ______________________________________________________________ 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
