It is sometimes useful to shift the KX3's IF to 8.0 kHz, instead of 0.0 kHz, by setting the RX SHFT menu entry to 8.0 kHz on the affected band. This is described in the KX3 owner's manual. Cases where this may be desirable include nearby AM broadcast transmitters, heavy mobile power supply noise, etc.
Until now, the use of RX SHFT=8.0 has disabled the DUAL RX feature (dual watch). The latest field-test release eliminates this restriction. The only catch is that VFO A now has to be within -7 kHz and +23 kHz of VFO B, rather than the original range of +/- 15 kHz. This asymmetrical DUAL RX range is still very useful for typical SPLIT-DX operation (e.g., "up 2" in the CW case). The KX3 keeps track of the separation for you in either case, automatically going in and out of DUAL RX mode as indicated by the SUB icon.
This change may be of interest to some CW operators who find that DUAL RX, in conjunction with a very small VFO A-B offset, creates keying artifacts that are audible in headphones. These artifacts (e.g., a click or a ringing tone) are usually masked by band noise. With the new firmware, use of RX SHFT=8.0 with DUAL RX can completely eliminate this effect.
If you're interested in testing this new release, please email me directly.
73,
Wayne
N6KR
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