Typical loss of the 5- and 6-pole 200-Hz filters is about the same. I believe we do have enough DSP-based gain compensation for all filter types, but I'll ask our techs to verify this.
The noise figure of the radio is established ahead of the crystal filters, so moderate loss in the filters is not significant from a performance standpoint. In fact the sensitivity and dynamic range of the radio are typically maximized when this filter is used. Wayne N6KR On Apr 15, 2016, at 4:40 AM, brian <als...@comcast.net> wrote: > The plots have a disclaimer that one can't compare the passband attenuation > for the filters. > > Some of us have noticed that with the old 200 Hz 5 pole filters the amount of > gain available to compensate for it was not enough. I observed that here by > comparing SPECTROGRAM peak outputs per filter. > > Presumably the 6 pole 200 Hz filter will have a bit more attenuation. > > How does the passband loss of the new/old 200 Hz filters compare? > > 73 de Brian/K3KO > On 4/15/2016 2:17 AM, Wayne Burdick wrote: >> Some of you may recall that we discontinued our 5-pole, 200-Hz filter last >> year. Our replacement for this filter has cleared all of our stringent test >> hurdles and is now available on our order page. >> >> The new filter (KFL3C-200) has six poles rather than five, significantly >> improving skirt selectivity. And at the center, the passband is 200 Hz at 6 >> dB down -- ideal for CW and narrowband data operation in high-QRM or QRN >> situations. (Our 5-pole filter was already a favorite of 160 meter CW >> contest veterans. The KFL3C-200 takes it up another notch. Maybe two.) >> >> Plots for all of our filters, including an overlay comparing the KFL3A-250 >> (INRAD 8-pole) to the new KFL3C-200, can be found at: >> >> http://www.elecraft.com/K3/K3_filter_plots.htm >> >> Next week, when we're all recuperating from the Visalia DX convention, we'll >> provide a link to a plot showing the 5-pole vs. 6-pole filter passband. The >> improvement in skirt selectivity is quite pronounced. >> >> This filter can be installed in a K3, K3S, or the sub receiver. To order, >> see: >> >> http://www.elecraft.com/elecraft_prod_list.htm#k3filters >> >> 73, >> >> Wayne, N6KR >> Eric, WA6HHQ >> >> ______________________________________________________________ >> 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 als...@comcast.net >> > ______________________________________________________________ > 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 n...@elecraft.com ______________________________________________________________ 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
