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
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