[Elecraft] ADT-200A Fully DSP transceiver

[Bill W4ZV]

P.B. Christensen wrote:
> 
> The ADT-200A does not have a perfect receiver.  It's a different kind of 
> receiver.  As technology allows for nearly Herculean receiver performance, 
> it becomes more difficult to classify one type as being "better" than 
> another.  That largely depends on what measurement category is most useful 
> to the individual operator (e.g., close-in DR, phase noise, Tx IMD, etc).
> 

Paul I did a brief scan of the manual and have a question.  The overall
block diagram shows a BPF ahead of the ADC, yet I saw the following comment:

"In the digital receiver the full signal spectrum is fed directly to a high
resolution A/D converter. All signal processing is made digitally, which is
ideal as it relates to distortions and noise. Since algorithms are
determined by software, uniform performance parameters are obtained. Another
benefit of this technology is the high degree of functional flexibility. New
functions can be added by simple software download."

I assume the BPF shown is simply one LPF anti-aliasing filter for rejecting
signals >30 MHz.  Since the ADT was designed in Europe where 40m BCI is
(still) a significant issue, how can the 112 dB BDR cope with the dynamic
range of nearby broadcast stations?  Is that BPF actually a set of band
limited filters?

73,  Bill


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