Hi Vic, Do you know if any plot of the frequency response K3's APF exists, or any similar data about its bandwidth at different levels of attenuation, and is its response "peaky"?
I might have told you that as part of the ongoing development of my MkII H-Mode receiver, I have for some time been considering various additions to its audio circuitry - one of which is some form of APF. The use of DSP is not an option for this receiver, because any ADC that I can afford would most likely ruin the 110db+ in-passband dynamic range of this receiver. Nor is any form of Q-Multiplier It has struck me though that an Audio Bandpass filter, whose bandwidth at the 1db points is say a few Hz without a "peaky" response, might possibly be a useful device to use as an APF rather than a filter whose response is "peaky" - when digging out signals in the noise floor. This is speculation because I have not yet had the time to build and evaluate the performance of an AF bandpass filter for this application. 73, Geoff GM4ESD ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
