PB=.01

[Mike Scott-7]

I also see and hear the emphasized low-frequency audio response when I
configure pass band shift to 10 Hz steps.

The audio actually sounds much fuller. In CW mode, filter set for 2.7 KHz
there is a clear audio roll off below 300 Hz. With Shift = .01 and filter
set for 2.7 KHz that roll off shoulder moves down to 50 Hz. The two lower
equalizer bands actually have control now.

Since the K3 can clearly process audio down to 50 Hz, can we have it
available in all modes? Those who don't want it can equalize it out.

Mike Scott - AE6WA
Tarzana, CA (DM04 / near LA)
NAQCC 3535
K3-100 #508 / KX1  #1311



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[Brett Howard]

I was quietly excited to see that the bottom two band were actually
able to do something when in that mode.  Makes me think that maybe its
not the audio section but something in the firmware that is rolling
off the bottom end...  I'd really love to be able to get more of the
lower frequency to pass through and then deal with the levels that
we'd like via the EQ.  ATM the bottom two bands seem almost completely
ineffectual.  Perhaps I just need a wider than 2.8Khz filter to be
able to get down there...

I just installed 100uF caps into the headphone amp output so I'll not
have to worry about that next field day.  I've got 2 more of the cap
that fits right onto the pads if anyone is interested to pay for the
shipping on them...

~Brett

On Thu, Aug 13, 2009 at 10:57 AM, Mike Scott<[hidden email]> wrote:

> I also see and hear the emphasized low-frequency audio response when I
> configure pass band shift to 10 Hz steps.
>
> The audio actually sounds much fuller. In CW mode, filter set for 2.7 KHz
> there is a clear audio roll off below 300 Hz. With Shift = .01 and filter
> set for 2.7 KHz that roll off shoulder moves down to 50 Hz. The two lower
> equalizer bands actually have control now.
>
> Since the K3 can clearly process audio down to 50 Hz, can we have it
> available in all modes? Those who don't want it can equalize it out.
>
> Mike Scott - AE6WA
> Tarzana, CA (DM04 / near LA)
> NAQCC 3535
> K3-100 #508 / KX1  #1311
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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[P.B. Christensen]

I was quietly excited to see that the bottom two band were actually
able to do something when in that mode.  Makes me think that maybe its
not the audio section but something in the firmware that is rolling
off the bottom end...

That's my bet.  Schematically, there's no reason why the first Rx EQ band
should have been ineffective until now when using a minimum of 100uF caps at
the H/P output.

Paul, W9AC

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