[Elecraft] K3 New DSP board installed

[Wes Stewart]

Is the spur at 3.9 KHz gone?

--- On Sat, 1/9/10, Steve Ellington <n4lq at carolina.rr.com> wrote:

From: Steve Ellington <n4lq at carolina.rr.com>
Subject: [Elecraft] K3 New DSP board installed
To: Elecraft at mailman.qth.net
Date: Saturday, January 9, 2010, 9:41 AM

The installation of the Rev D DSP board went smoothly. I updated the 
firmware and all is well.

The first thing I noticed was how much louder the headphones (Bose 32 ohm) 
are. I use the FP jack. The difference is huge. Before the upgrade, I ran 
the CW sidetone at 38. Now it's at 14! I'm not sure about the speaker volume 
but I don't believe there was much if any change.

I don't
 hear any change in the low frequency audio. It had already been 
improved earlier with one of the FW updates. Headphone impedance can affect 
this too.  Using MixW, I can see a well defined null in audio level below 50 
Hz.

The 3rd harmonic is still present in the low level audio output. This has 
bugged me from day one on the K3. It's weak but visible on the waterfall. 
See the photo at
http://n4lq.webs.com/apps/photos/photo?photoid=65288758 Don't bother telling 
me it's my sound card or my level is too high. I've already been trough that 
routine.

As for audio quality and listener fatigue, time will tell. This radio is 
such an improvement over my IC-7800 that anything I say is just nit picking.

Was the upgrade worth the money? I guess it depends on how you feel about 
money and your K3.