... or There's No Such Thing as a Free Lunch.
Until recently, I only had the 13 kHz and 2.7 kHz roofing filters
installed in my K3. I mostly use CW and usually found the DSP
filtering perfectly adequate for my narrow bandwidth needs. But after
having a few QSO's disrupted by nearby
Joe Planisky wrote:
... or There's No Such Thing as a Free Lunch.
Until recently, I only had the 13 kHz and 2.7 kHz roofing filters
installed in my K3. I mostly use CW and usually found the DSP filtering
perfectly adequate for my narrow bandwidth needs. But after having a
few QSO's
Joe Planisky wrote:
This required 6 dB of gain on the 500 Hz filter. However, I noticed that
boosting the filter gain by 6 dB also boosted the noise floor by 6
dB. In other words, the S/N ratio at 500 Hz bandwidth was 6 dB worse
than at 550 Hz bandwidth. After thinking about it
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