According to the review, the radio is nearly perfect. Very strong performance
nearly everywhere.
There were only two sets of numbers that could raise questions.
The TX 3rd order IMD performance was not that good (29db) but it was on the
worst band. Not sure the testing was before or after the firmware changes
to decrease TX IMD. W8JI praised K3's low SSB IMD.
The second one was a mediocre performance of the 1.8 filter (see table
below). It had worse close IMD than the 2.7 filter, in some cases by 20db!
On the other hand, everyone in this group praises the 1.8 filter so perhaps
the filter is still doing something useful. Also perhaps the latest 1.8
filters were improved.
Third Order Intermodulation Dynamic Range (dB) at MDS (preamp off, 14 MHz)
Spacing (kHz) Roofing Filter (Hz)
above/below
2800 2700 1800 500 400
20 104/104 105/106 101/98 104/104 105/106
5 105/103 96/106 90/84 102/101 106/105
2 99/100 90/89 74/82 90/90 106/103
1 94/81 89/79 72/81 87/82 99/99
昀�
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