[Elecraft] K3 & ADAT ADT-200A by HB9CBU

[Bill W4ZV]

Tom Wylie wrote:
> 
> Isn't the K3 an SDR???
> 
> GM4FDM
> 

Not according to Flex Systems..."Real radios don't need knobs".   

Maybe not, but so far they don't win HF contests either...unless there are
no other entrants in the category.  ;-)

Technically you're correct.  The K3 and most high-end transceivers
introduced in the past ~10 years are technically SDRs (but they hide it
well).  :-)  There are at least 3 different variants of SDRs:

1.  Hybrid superhet/DSP.  Roofing filter front-end followed by DSP (e. g.
Orion, K3, IC-7800, etc).  
2.  Quadrature Sampling Detector (QSD) front-end (e.g. Flex 1000, 5000,
etc).
3.  Direct Conversion (high speed ADC) front-end  (Perseus, QS-1R, HPSDR,
etc).

73,  Bill


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