> The design goal was to duplicate the FT-1000D APF. The FT-1000D has > no variable Q function. What you are proposing is completely different > than the design parameters ... you want an Autek QF1 not the FT-1000D APF.
I agree with Joe on this. The bandwidth of a CW transmission is narrow and does not change.(*) I think pursuing variable Q would amount to diminishing returns over fixed Q and adds an unnecessary variable. I also like the use of the context filtering - a feature not found in the original FT-1000/D circuit. As Joe suggests, an Autek QF1A can be used if one really wants extreme APF flexibility, or a single-channel parametric EQ may be a better way to go since a PEQ allows the user to alter gain, Q, and frequency. Either way, those devices can be easily inserted into the K3's audio path. Paul, W9AC (*) CW bandwidth does change with speed but at normal CW keying rates, bandwidth is largely a function of only the waveform slope. At high switching speeds, bandwidth becomes relevant as a function of both waveform slope and keying speed. ______________________________________________________________ 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
