K3 Audio Mods

[P.B. Christensen]

The audio passband shift changes in the latest K3 beta firmware release
served as a reminder that the K3 audio mods on N1EU's website needed
updating.  Barry recently made those changes and they're available through
the link below:

http://n1eu.com/K3/k3audiomod.htm

Whether Elecraft is, or will in the future, offer a Main DSP Board swap-out
program is best answered by Elecraft.  Swapping the board is certainly much
easier than changing multiple SMT parts for the affected Rx and Tx audio
paths.  My understanding is that the new Main DSP Board is already part of
new K3s going out the door.  However, I am unsure as to what S/N the cut-in
occurred.  Clarification from Elecraft on these points would be very
helpful.

Paul, W9AC

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[ab2tc]

Hi,

Has anything been done to eliminate the tones at 3900, 4700 and 7800Hz (plus several others) on the line output? I am assuming they are there on the headphones and speaker outputs, too, although I can not hear them, but they could contribute to a slight roughness of the audio compared to, say the PowerSDR audio via LP-Pan.

AB2TC - Knut

P.B. Christensen wrote

The audio passband shift changes in the latest K3 beta firmware release
served as a reminder that the K3 audio mods on N1EU's website needed
updating.
<snip>

[Mike Harris]

G'day,

Seems to have gone quiet on the audio LPF that was talked about a
while ago.

Regards,

Mike VP8NO

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[Bob W9RFS]

I have K3 #995 with mcu3.41, dsp2.37 and I have kept up with all the factory audio mods to date. I swapped out my main dsp board for a new one from Elecraft in August. At the time I was running mcu3.25, dsp2.21 and after the swap I noticed improved low feq. response. I believe mcu3.25, dsp2.21 was the FW pre-release that had the surprise extended low freq response.  With the latest firmware I am still enjoying improved low freq response and perhaps it is even a little better; based on my crude estimates using spectrogram16 while listening to AM broadcast band stations. Because of the timing of my dsp board swap with the loading of the latest beta firmware, I was never really certain what led to the improvement. Is it the hardware or the firmtware, or are both required for older K3's?  
Bob W9RFS

"The audio passband shift changes in the latest K3 beta firmware release served as a reminder that the K3 audio mods on N1EU's website needed
updating.  Barry recently made those changes and they're available through
the link below:

http://n1eu.com/K3/k3audiomod.htm

Whether Elecraft is, or will in the future, offer a Main DSP Board swap-out
program is best answered by Elecraft.  Swapping the board is certainly much
easier than changing multiple SMT parts for the affected Rx and Tx audio
paths.  My understanding is that the new Main DSP Board is already part of
new K3s going out the door.  However, I am unsure as to what S/N the cut-in
occurred.  Clarification from Elecraft on these points would be very
helpful.

Paul, W9AC "

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[P.B. Christensen]

> spectrogram16 while listening to AM broadcast band stations. Because of
> the
> timing of my dsp board swap with the loading of the latest beta firmware,
> I
> was never really certain what led to the improvement. Is it the hardware
> or
> the firmtware, or are both required for older K3's?
> Bob W9RFS

Bob,

The improvements you are hearing are related to both the hardware update on
the Main DSP Board as well as the latest F/W revision.

Paul, W9AC

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