[Elecraft] [K3] Soundcard digital mode follow-up

[Don Putnick]

2nd try - don't know why my last e-mail was blank

Thanks to all of you for the suggestions. I didn't make it clear what the circumstances were, so here goes.
I was using the K3 in DATA A mode with the stock 2700 roofing filter. No attenuation, preamp, or noise reduction. I connect the LINE IN and OUT to my MacBook's External Speaker and Mic. I use cocoaModem software for PSK31. I was going after weak traces in the presence of 1-3 band hogs. My first reaction was to do exactly what Don Wilhelm suggested. I reduced the DSP filter to 400 Hz, but when I did that, the waterfall saturated. Knowing from a propagation analysis that it was very unlikely I'd be successful anyway, I gave up.

Here are the suggestions I received, the last three in combination with the first two.

1. Decrease the DSP filter bandwidth
2. Buy a narrow roofing filter for digital modes
3. Reduce LIN OUT level
4. Turn Attenuator on
5. Turn AGC off

I'll give these a try over the weekend. Thanks again to all of you

Don NA6Z K3 #5495