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Just had a 10 min CW QSO with VK2IOW with my QMX+ 0n 20m, the filtering on this little radio is on another level ! only ran 3.5 Watts and a 20m EFHW !

Nice one Chris! Congrats...?

Passband 50

Centre 625

Offset 625

Beautiful

Nice result. QRP RIG?with a dipole for G to VK CW QSO.

Between the 50 Hz and the 300 Hz filter BW there is almost 8 dB difference in dynamic range. This is in the range of a beam antenna gain compared to a dipole. Although the antenna gain works in both directions.

I will have to try to listen the CW signal using the 50 Hz BW filter.

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73 Bojan S53DZ

On my QMX(s), I currently have 100 Hz @ 625 as the lowest BW -- partially to limit to a sensible number of options to rotate through -- and largely because I didn't personally observe improvement at 50 Hz (as to my sense I was getting more 'purity' w.r.t. the tone). ?On the QMX's narrowest setting, I could perhaps characterize it as feeling as if I wasn't entirely "locked in" (to the tone itself over the duration of a QSO). ?That being said, it'd be worthwhile for me to do this comparison in different RF environments. ?

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I also like having the "Auto-offset" setting turned to Yes/on (since the tone freq. graduates higher as you narrow down), but do find there is a bit of additional RIT tweaking to do.

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Conversely, I go down to 50 Hz all the time on the Yaesu ftDx10, and I definitely notice the SNR improvement as I narrow all the way down.

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Purely just my own perceptions!