thanks Ron, I guess this relates to Q=f/deltaf ? Didn't even think of this, and it's interesting that the effect is noticeable at these frequencies.
Pf >>>>> "Ron" == Ron D'Eau Claire <[email protected]> writes: Ron> I believe that you'll find that is true of any filter. By cutting the tone Ron> frequency almost in half (800 to 440 Hz), you almost double the effective Ron> width of the passband. That leaves more room for the keying sidebands which Ron> means less "ringing" or stretching of the keying transitions. Ron> (I like lower frequency tones too.) Ron> 73 Ron AC7AC Ron> -----Original Message----- Ron> From: [email protected] Ron> [mailto:[email protected]] On Behalf Of Pierfrancesco Caci Ron> Sent: Sunday, May 12, 2013 1:25 AM Ron> To: [email protected] Ron> Subject: [Elecraft] [K3] APF and Pitch Ron> Someone mentioned that APF rings less when pitch tone is set to 440 Hz Ron> instead of 800 Hz. So, I'm trying and it indeed seems to ring less. Ron> Anyone else hearing this? Ron> Is this some DSP effect or a psychoacustic effect? Ron> Condition of test: Ron> 200Hz 5-pole filter Ron> DSP BW 50Hz Ron> RF gain backed so that signal is barely audible with no APF RX Audio EQ Ron> bands 4 and 5 set to 0, all rest down -6 Ron> Pf Ron> -- Ron> Pierfrancesco Caci, ik5pvx -- Pierfrancesco Caci, ik5pvx ______________________________________________________________ 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
