I’ve had my KX2 twelve months now and thinks it’s the best portable/SOTA HF CW rig I’ve used. From the Elecraft spec and all the glowing reviews I had expected its receive sensitivity (-136 dBm for SSB/CW, or 0.0355uV) to outclass my Yaesu FT-857D (spec’d as 0.20uV, or -101 dBm) and my first-generation FT-817 (0.25uV, or -99 dBm) or even my Youkits HB-1B.
But, after months of A vs B testing using the same antenna on weak stations and beacons from 80m to 17m, I hear no noticeable difference, no superior KX2 performance.
In fact, the 857 S-meter consistently shows signals about two S points higher, although to be fair it also shows a higher reading on background noise for the same filter bandwidth - maybe my KX2 S-meter is pessimistic.
The KX2 is used with internal ATU and pre-amp ON; the 857 or 817 with external LDG Z-11 Pro ATU – both set-ups getting the same or very similar VSWR.
Some months ago, I sent the KX2 back to my UK dealer who installed the latest firmware and ran tests, which apparently it passed. No change on A-B testing on return.
Has anyone done sensitivity comparisons of the KX2 with these or similar rigs?