[Elecraft] K3 2nd RX Specification

[wayne burdick]

Phil wrote:

> This is the latest news release about the sub receiver:-
>
> /"When we release a product, it has to meet a number of criteria. Raw
> performance by traditional measures is just one of these. Fortunately
> the subreceiver has met our expectations in this regard, with dynamic
> range *virtually identical* to that of the main."/

Hi Phil,

The main and subreceivers use identical circuitry, including bandpass 
and crystal filtering, synthesizer, and DSP. They *are* identical.

The only reason I used the word "virtual" when describing the 
performance is that the sub and main are both subject to +/- 1 to 2 dB 
of variation, as would be any two K3s. This is the limit of the state 
of the art in manufacturing and alignment.

Suppose you test your subreceiver and find that its IMDDR3 at 5 kHz is 
107 dB, while your main receiver is "only" 105 dB (or vice-versa). Are 
these "identical"? No, they're "virtually identical." But in statistics 
class we referred to this as a "ceiling effect." Both measurements are 
off the charts at the high end of what's possible in a production 
radio.

I'm glad to see that we're being held to a high standard of semantics, 
as well as performance  :)

73,
Wayne
N6KR

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