Made a test tonight on my KX3 on 28-MHz:
First I tuned my triband yagi to SWR 1.5 using my Drake MN2000
antenna tuner and then ran the KX3 auto-tuner to get a perfect
match. With preamp off I have to run AF gain up to 30 to hear
background noise and when I tune the VFO there is a mild popping
noise as the digital encoder it stepped up or down in frequency,.
Next I turned on PRE (set for 20 dB in the menu) and I can barely
hear the VFO over the white band noise as I tune. If I turn the AF
gain down (to 18) to hear the same level of background noise as with
the PRE off, then I am not able to hear any noise from the VFO.
Since I would normally use the preamp turned-on 10m, this says VFO
tuning noise is a "non-issue".
If I disconnect the antenna then VFO tuning noise is present
(background noise is down about 20-dB).
I use 28-MHz as my IF with a 2m transverter and never noted any noise
from the VFO. Conversion noise is higher than the VFO noise.
73, Ed - KL7UW
KX3-S/N 0475
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