[Elecraft] K3 New DSP board installed

[Guy Olinger K2AV]

How far down dB-wise is the 3rd harmonic?

On Sat, Jan 9, 2010 at 11:41 AM, Steve Ellington <n4lq at carolina.rr.com> wrote:
> 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.
>
>
> 73 Steve
> N4LQ
> N4LQ at carolina.rr.com
>
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