Re: KX3 Baseband filter?

Posted by Rick Prather-2 on May 21, 2011; 3:06pm
URL: http://elecraft.85.s1.nabble.com/KX3-Baseband-filter-tp6389556p6389576.html

Thank you Bruce,

I was also puzzled by that part of the presentation.

Rick
K6LE

On 5/21/2011, at 8:01 , Bruce Beford wrote:

> "Baseband" refers to the fact that the QSD down-converts the RF to IQ
> streams at directly near-audio range frequencies. The ADC converts this to
> digital, and the DSP then does the demodulation. From the description, the
> "IF" frequencies are in the 10 KHz range. So, the "baseband roofing" filter
> will be a selectable active "audio" filter operating in this range, prior to
> the ADC. This will prevent excessive "out of band" energy from reaching the
> ADC.
>
> Bruce, N1RX
>

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