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

[Ken Roberson]

Don,
20 Meters is a good place to start.
Make sure your not overdriving your sound card.
Turn ATT on , signal are so strong on 20M you dont need
a preamp.

GL 73 Ken K5DNL
---------------------------------------------------------

--- On Wed, 7/6/11, Don Putnick <don.putnick at earthlink.net> wrote:

> From: Don Putnick <don.putnick at earthlink.net>
> Subject: [Elecraft] [K3] Soundcard digital mode follow-up
> To: "Elecraft Mailing List" <elecraft at mailman.qth.net>
> Date: Wednesday, July 6, 2011, 2:45 PM
> 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
> 
> 
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