I normally have always a cable from the rear line out directly to my laptop line in audio card since the first day the K3 arrived in Nov 09,then I run everytime I turn it on the Spectralab audio analyzer software and at the begining my non modified DSP board made the radio respond from only 180 Hz to about 3500 Hz + - 6db,then when I called Elecraft asking what to do to open that narrow BW they sugested to send me a new modified DSP board with the W9AC hardware changes to swap for my original board,I accepted the proposal and they sent me the new board.With the help of my friend Julio AD4Z who put together his K3 (mine arrived already assembled) we installed the new DSP board and inmediately we noticed the audio difference,the audio response was then from 80 to 4000Hz and later with all the firmware updates they had done it opened more and more and with the actual version 3.76 my audio response is from 50 to 4000Hz + - 6db which for me is plenty audio
bandwith for RX and TX.
Using the TX EQ properly set my maximun transmit audio bandwith goes from 60 to 3800Hz which I never run that wide,normally I have it set from 100Hz to 3000Hz when using the Yamaha CM-500.
I suggest to Oliver to see the line out audio response before and after the board swap and I am sure you will see a big difference specially at the roll off freq.Let us know what you see..
My two cents to the topic.
"For a refined ham it is compulsory to own a k3"
--- On Sun, 2/28/10, Jan Erik Holm <
[hidden email]> wrote:
From: Jan Erik Holm <
[hidden email]>
Subject: Re: [Elecraft] K3 DSP Board Testing Procedure
To:
Cc:
[hidden email]
Date: Sunday, February 28, 2010, 7:14 AM
Would be interesting!
Beats me why Elecraft can´t present the facts, I´m sure
they have measured since I bet they know how to.
/ Jim SM2EKM
------------------------------
Oliver Sweningsen wrote:
> Does anyone have side-by-side test results from old and new DSP boards? Or,
> can someone suggest a good test procedure to quantify low frequency
> performance improvement? I have one modified and one unmodified K3 and plan
> to run some tests.
>
> Oliver, W6NV
>
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