[Elecraft] Re: K3 Filter IMD/BDR specs

[wayne burdick]

On Sep 13, 2007, at 10:04 AM, David Woolley wrote:

> Charles Harpole wrote:
>> So, the exact measurements of anything in the radio are beside the 
>> point... I know I want the radio and I want filters for narrow SSB 
>> and general CW, so I add extra 1.8 and 500.
>
> In that case you may have wasted your money as you haven't given one 
> of the valid reasons for buying the optional filters.  They are 
> roofing filters, not primary selectivity filters.

They are both.

You can make the DSP bandwidth narrower the selected crystal filter, 
but the crystal filter establishes the 1st IF bandwidth, which is 
critical to achieving high close-in dynamic range.

We're working on the final numbers (which involves testing several 
radios with each filter to make sure they're consistent). Preview: they 
will be outstanding  :)

73,
Wayne
N6KR


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