Re: [Elecraft] KX3 filter question
Thanks Grant and K9ZTV for the confirmation that I sorta figured it out. (hi) Mike Mike, Coreen & Corey Keswick Ridge, NB -Original Message- From: Grant Youngman [mailto:ghyoung...@gmail.com] Sent: December 8, 2020 5:04 PM To: Mike Smith VE9AA Cc: Elecraft Refl Subject: Re: [Elecraft] KX3 filter question The introduction the KXFL3 manual described these filters. (https://ftp.elecraft.com/KX3/Manuals%20Downloads/E740165%20Elecraft%20KXFL3%20Option%20Rev%20A3.pdf) They are not IF filters in the sense you may be used to. In the KX3, selective filtering is done in the DSP. These are roofing filters, at baseband, that sit in front of the DSP, and serve to improve the dynamic range of the radio. They switch in automatically, and there’s no way to select them specifically (and no reason to). But the display does show you what roofing filter is active. Grant NQ5T > On Dec 8, 2020, at 3:48 PM, Mike Smith VE9AA wrote: > > > > I am wondering about the various filter widths and how to adjust. It almost > seems like it goes to FIL 1, 2 3 automatically as I adjust the PB tuning,. > > > > IS THIS THE WAY FILTERS WORK? > > > > I __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 filter question
The introduction the KXFL3 manual described these filters. (https://ftp.elecraft.com/KX3/Manuals%20Downloads/E740165%20Elecraft%20KXFL3%20Option%20Rev%20A3.pdf) They are not IF filters in the sense you may be used to. In the KX3, selective filtering is done in the DSP. These are roofing filters, at baseband, that sit in front of the DSP, and serve to improve the dynamic range of the radio. They switch in automatically, and there’s no way to select them specifically (and no reason to). But the display does show you what roofing filter is active. Grant NQ5T > On Dec 8, 2020, at 3:48 PM, Mike Smith VE9AA wrote: > > > > I am wondering about the various filter widths and how to adjust. It almost > seems like it goes to FIL 1, 2 3 automatically as I adjust the PB tuning,. > > > > IS THIS THE WAY FILTERS WORK? > > > > I __ 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 Message delivered to arch...@mail-archive.com
Re: [Elecraft] KX3 Filter Question
It acts much like the roofing filters in the K3. Sherwood measured the difference in dynamic range at 2Khz spacing as being an improvement from 96 dB to 104 dB. There’s some degradation noted at 1 KHz spacing limited by opposite sideband rejection, but the footnote isn’t clear whether this was after per band opposite sideband null optimization or not, and the extent to which that matters with or without the filter module in place. Grant NQ5T > On Jul 29, 2020, at 4:16 PM, Doug Millar via Elecraft > wrote: > > Hi, I have a KX3 that I like very much. I put in the filter modification. > Does anyone have any specifications on how much the filter helps the > receiver- like before and after? Thanks, Doug K6JEY __ 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 Message delivered to arch...@mail-archive.com
