[Elecraft] Elecraft technology

[N2EY@aol.com]

In a message dated 9/4/03 12:42:35 PM Eastern Daylight Time, la3za@qsl.net 
writes:


> I could rephrase my question
> differently, why did it take until 1998 for this architecture to make it
> into ham receivers, why didn't it happen say ten years earlier?
> 
> 
> 

It's not a new concept at all - back in 1957, W1DX wrote a QST article called 
"What's Wrong With Our Present Receivers?" that laid out the concept of a 
single conversion scheme with high IF using the then-new high frequency crystal 
filters to put the selectivity up near the antenna. 

Several receiver designs in QST, the ARRL and RSGB Handbooks use this 
concept. The "Miser's Dream" design (1965) and "Junior Miser's Dream" (ARRL Handbook) 
were good examples. A receiver by G3PDM in the RSGB Handbook uses single 
conversion, a beam deflection mixer, no RF stage and a high IF with xtal filters - 
plus a hybrid PLL circuit for the LO! 

Manufactured rigs like the Swans (100 series, 350, 500) National (NCX-3, 200) 
and  the legendary Squires Sanders SS-1R used this concept as well. The Drake 
R4-C and TR-4/TR-3 also use it. So do the Ten Tec ham-band-only rigs

The real genius of the K2/K1 design was figuring out how to do it 
inexpensively without compromising performance. Or as the British say "Real engineering 
is doing for a penny what anyone could do for a pound"...

73 de Jim, N2EY


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