[Elecraft] New from Elecraft: High-Performance 200-Hz, 6-pole Crystal Filter

[brian]

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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