> But with the upcoming firmware upgrades, the flexibility will be > enhanced, so I can make the 250 Hz filter kick in at, say 240 Hz, > if I want to. At least, that's my understanding of what's coming > up.
The beta firmware does not allow setting width in 10 Hz steps. Only the center frequency (FC) is adjustable in 10 Hz steps. > This is a significant enhancement, especially at narrow CW bandwidths > -- and in my opinion-- much more desirable than a new variable bandwidth > roofing filter You will not see a big difference with a "DSP tracking" filter on CW if you already have fixed 400, 250 and 200 Hz filters. Where the capability becomes noticeable is on SSB due to the wide steps between 2.8 KHz and 1.5 KHz and in digital modes with the step between 2.8 KHz and 400 Hz. It is not possible (there are not enough filter 'slots') to install roofing filters even every 500 Hz even though the filters are available - e.g. 2.8 KHz, 2.1 KHz, 1.8 KHz, 1.5 KHz, 1000 Hz, 500 Hz, and 250 Hz - particularly if you want to operate FM and AM or ESSB where it is currently necessary to tie up slots with BOTH the FM (13 KHz) and AM (6 KHz) filters. 73, ... Joe, W4TV > -----Original Message----- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Chuck Guenther > Sent: Friday, August 07, 2009 9:00 AM > To: d...@w3fpr.com > Cc: elecraft@mailman.qth.net; joachim.groe...@ewetel.net > Subject: Re: [Elecraft] Variable bandwidth crystal filter > > > Good review of the flexibility of the K3, Don! > > My K3 filter slots are all filled: 2.7, 2.1, 400, 250, and > 200. Using > the K3 Utility, I can set the 250 Hz filter to kick in at a DSP > bandwidth of 300 Hz, 250 Hz, or 200 Hz. But with the > upcoming firmware > upgrades, the flexibility will be enhanced, so I can make the 250 Hz > filter kick in at, say 240 Hz, if I want to. At least, that's my > understanding of what's coming up. This is a significant > enhancement, > especially at narrow CW bandwidths-- and in my opinion-- much more > desirable than a new variable bandwidth roofing filter. > 73, > Chuck NI0C > K2-10 s/n 5853 K3-100 s/n 1061 > > > > Don Wilhelm wrote: > > Chuck, > > > > True, true *BUT* the roofing filter can suppress signals before they > > get to the hardware AGC. If one is happy with only the DSP > filtering > > alone, then do not purchase any roofing filters at all, > just go with > > the stock 2.7 kHz roofing filter. Different strokes for different > > folks, some need the additional filtering, others do not - > and others > > will purchase a full set of filters just to have them > available - the > > choice depends on your operating habits and expectations as well as > > your ham radio budget. The casual operators will have > great success > > with only the 2.7 kHz filter, but a contester will want a full > > complement of roofing filters to fight those 'tough times'. > > > > 73, > > Don W3FPR > > > > Chuck Guenther wrote: > >> I simply meant that if folks were looking for a more or less > >> continuously variable selectivity in the K3, then the 10 > Hz increment > >> DSP filters would provide that, for all practical purposes. > >> 73, > >> Chuck NI0C > >> > >> > >> Ed K1EP wrote: > >> > >>> At 8/5/2009 07:51 PM, Chuck Guenther wrote: > >>> > >>> > >>>> With the upoming 10 Hz resolution DSP upgrade (Firmware > 3.23 being > >>>> talked about), I certainly wouldn't see much need for a > variable BW > >>>> roofing filter. > >>>> > >>> Can you explain that relationship? > >>> > >>> > >>> > >>>> 73, > >>>> Chuck NI0C > >>>> K2, K3 > >>>> > >>> > >> > >> ______________________________________________________________ > >> 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 > >> > --------------------------------------------------------------------- > >> --- > >> > >> > >> No virus found in this incoming message. > >> Checked by AVG - www.avg.com Version: 8.5.392 / Virus Database: > >> 270.13.45/2285 - Release Date: 08/06/09 05:57:00 > >> > >> > > > > ______________________________________________________________ > 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 ______________________________________________________________ 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
