http://elecraft.85.s1.nabble.com/KX2-added-to-Sherwood-s-list-tp7632773p7632974.html
>
> Here are the odd details on the KX2 filter leakage. If the filter
> bandwidth is 500, 400, 300, 200 or 100 Hz, filter leakage makes the
> measurement at 2 kHz impossible. On the other hand, if the filter
> bandwidth is 550, 450, 350, 250, 150 or 50 Hz, then the measurement
> can be made. The League chose to publish a 2-kHz dynamic range in QST
> even though the measurement cannot be made on the high side with the
> standardized 500-Hz filter bandwidth (or any even bandwidth value).
> Note: Both the League and I only publish the LOWER of the two
> measurements. Let’s say the low side dynamic range of some radio is
> 95 dB and the high side is 90 dB. Both the League and I publish the
> lower worse-case 90 dB number. In the case of the KX2, I couldn’t pick
> the lower of the two readings since no measurement is possible when
> using the standard 500-Hz filter.
>
> Since the 2-kHz dynamic range value could not be made with the
> standard filter bandwidth at 2 kHz, but could be made at a 3-kHz
> signal spacing, I published that data. It may be of interest that the
> 2-kHz dynamic range number with the non-standard 450-Hz bandwidth was
> only 1 dB worse than the 3-kHz value. The point of listing the 3-kHz
> value, or any other radio with a non-2 kHz listing is to point out the
> radio has a limitation in its filter performance.
>
> My long form report on the KX2, available in PDF format, goes into
> detail about this issue, and has data on the two radios I tested,
> listed by serial number.
>
> At this point, Elecraft does not know why the KX2 behaves this way, or
> whether there is a possible firmware fix.
>
> Rob Sherwood
> NC0B
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