[Elecraft] K4 Receive Filter question

[Louandzip]

 That's not a simple or easy question to answer, especially since there's been no independent test of a K4, and there are many different criteria that go into it.  That said,  I'll go out on a limb and say that in most all practical situations on the air, it won't be. I say that because I've listened to and half-assedly compared a number of very good radios and some less good radios on the air. They might sound different, and take some tweaking of the controls to make them sound a similar as possible, but in the end I couldn't copy sigs better on one than the other. The K3 is really good in the tests, and I'm confident the K4 will surpass it, but that's at level that will only matter in what I consider to be exceptional circumstances.  

I'll add that I'm not the radio connoisseur that some are, and what I feel is largely the same, others may find hugely different. That doesn't stop me from wanting the best, even if I believe it won't make a practical difference in my operating. 




    On Tuesday, January 19, 2021, 12:47:17 AM MST, BRUCE WW8II <wa8hgx at gmail.com> wrote:  
 
 I also would appreciate a real answer to the question.  The question is
will the K4 or K4D be as good or better on receive than my K3s with the
2.1kHz and the 200Hz filters.

Bruce WW8II

On Tue, Jan 19, 2021 at 12:56 AM RVZ via Elecraft <elecraft at mailman.qth.net>
wrote:

> I believe there are no crystal Roofing Filters in the standard K4 model.
> Yet the manual talks about "one set of receive filters".  Please advise the
> type and bandwidth of these filters?  (DSP?)
>
> From the K4 Manual:  There are three models: the basic K4, with one set of
> receive filters and one analog-to-digital converter (ADC); the K4D, with a
> second set of receive filters and a second ADC; and the K4HD, which adds a
> superheterodyne front end that can be enabled as needed to provide even
> greater dynamic range. The superhet module uses high-performance,
> narrow-band crystal filters such as those used in the Elecraft K3S.  Thanks
> & 73, Dick- K9OM
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