160m sensitivity below 1.9mc?

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160m sensitivity below 1.9mc?

WE0H
Is it normal for the sensitivity to drop off starting at 1.9mc on 160
meters? The power output is 10w across the whole band but tuning from
2mc on down, there is a real apparent sensitivity degrade starting at
1.9mc. I have the VCO tuned so it stops receiving at 1.36mc. It tunes
well above 2.0mc on the other end.

Is there a mod or tweak I can do to keep the hot receive sensitivity
down to 1.80mc? The BC band is not important but I want all of 160
meters performing the same.

Many thanks,
Mike
WE0H
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