Re: K4 Dynamic Range
Since the ADC in the K4 is the same as everyone else (quote Wayne), excluding Flex (my comment), I would expect the dynamic range to be about 100 dB, maybe a few dB less, with similar sample variation as observed in the Icom radios. The K3 is about 105 dB. Who would ever notice that difference?
On the other hand, a K3S blocks around 150 dB above the noise floor, while the Icom and Flex over-range the ADC in the mid 120s. (The term blocking does not apply to a direct sampling radio.)
The only time I have ever seen an Icom over-range was a 7300 on 10 meters with preamp 2 enabled, and a trucker drove by on 11 meters 700 feet from my 5-element mono-band Yagi which was pointed towards the highway. There is a slight (?) possibility the trucker was running more than 5 watts!
Note: I live in the country in Colorado, not on the east coast or in EU on 40 meters with big BC signals above 7200 kHz.
From: Elecraft-K3@groups.io [mailto:Elecraft-K3@groups.io] On Behalf Of Drew Vonada-Smith K3PA
Sent: Friday, May 17, 2019 9:57 AM
Subject: [Elecraft-K3] K4 Dynamic Range
Of course, the radio looks great with the minimal information currently known. One thing that gives me pause is the option to add a superhet RX for the highest dynamic range. If this was felt to be a useful option, the question is, what is the dynamic
range for the direct sample mode? And how much better is it with the superhet RX option?
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