> We looked at this in independent reviews and our in-house plots. The > keying BW looks pretty much the same on all three rigs. The 100 W K3 > may be a tiny bit better, but there's nowhere near "twice" the > difference.
While the graphs in QST are not the best in the world, I'm comparing the K3 and KX3 at -60 dB. At that level the "outside" of the K3 is, at most +/- 300 Hz while the KX3 is at least +/- 500 Hz. In any case, the published composite noise level of the K3 - even with the original synthesizer - is equal to the KX3 at 2 KHz while it is in some cases as much as 25 dB better in the 10 - 100 KHz range. While it might not be an issue at 10 - 15 Watts, that's a whole lot of phase noise when run into the KX3 into a KXPA100 to drive a "full gallon". 73, ... Joe, W4TV On 5/31/2016 4:12 PM, Wayne Burdick wrote:
Joe, The KX3, KX2, and K3/K3S should have virtually the same keying bandwidth. They all use the same raised-cosine keying envelope shape, and this is by far the dominant factor unless the transmit final amplifier is being overdriven. We looked at this in independent reviews and our in-house plots. The keying BW looks pretty much the same on all three rigs. The 100 W K3 may be a tiny bit better, but there's nowhere near "twice" the difference. The K3S (or K3 with KSYN3A upgrade) does have the edge in composite, wide-band transmit phase noise. RMDR for the K3S (or K3+KSYNA) is roughly the same. Wayne
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