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Re: Many uBitx's have reduced power on 40m CW


 

Evan,

The dip on 30m is because it is using the 40m LPF, which must attenuate a 20m second harmonic.
But hey, it's primarily an SSB rig.

My only concern would be that the big C81 causes too much power out on 80m.
Shouldn't be a problem for CW where the PA can be non-linear,
but for 80m SSB there may be some IMD popping up unless you back off some on RV1.
Or increase R83.

Jerry, KE7ER



On Thu, Apr 8, 2021 at 02:48 AM, Evan Hand wrote:

The only abnormality with that mod is the dip for 30meters.? I am not going to pursue that issue as I consider it a good tradeoff for the 40meter increase.

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