Re: KX3 Baseband filter?

Posted by Bruce Beford-2 on May 21, 2011; 3:01pm
URL: http://elecraft.85.s1.nabble.com/KX3-Baseband-filter-tp6389556p6389573.html

"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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