K3 Flat Audio?

[N4LQ-2]

Someone kindly mentioned SR5 here so I downloaded it and observed that my
audio from the K3 had a pronounced peak around 1600 Hz. I compensated for
this by adjusting the K3's RX equalizer so that EQ (6) is -4db, EQ (7)
is -4db and EQ (8) is -2db. I now have a flat response across the spectrum.
QRN is less distracting now. Also, my waterfall on MIxw is nice and even all
the way across now. This isn't very scientific. I was just using band noise
to adjust the EQ for a flat response but since band noise is what I'm
dealing with, I felt it was adequate.
Question is: Has anyone else noticed this? Do you think it's something to do
with filter shape? Maybe the audio amp. is indeed flat but the filters
aren't and I'm compensating for them. Whatever....I'm just glad there K3 has
that nice EQ!
N4LQ

Steve Ellington
[hidden email]

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[David Cutter]

I'm not familiar with SR5, but the peak at 1600Hz MAY be deliberate:  this
has been used by some to increase readability in voice channels, though, not
sure if this is good in the presence of high noise as on HF.

David
G3UNA

----- Original Message -----
From: "n4lq" <[hidden email]>
To: <[hidden email]>
Sent: Saturday, May 24, 2008 11:50 PM
Subject: [Elecraft] K3 Flat Audio?

> Someone kindly mentioned SR5 here so I downloaded it and observed that my
> audio from the K3 had a pronounced peak around 1600 Hz. I compensated for
> this by adjusting the K3's RX equalizer so that EQ (6) is -4db, EQ (7)
> is -4db and EQ (8) is -2db. I now have a flat response across the
> spectrum. QRN is less distracting now. Also, my waterfall on MIxw is nice
> and even all the way across now. This isn't very scientific. I was just
> using band noise to adjust the EQ for a flat response but since band noise
> is what I'm dealing with, I felt it was adequate.
> Question is: Has anyone else noticed this? Do you think it's something to
> do with filter shape? Maybe the audio amp. is indeed flat but the filters
> aren't and I'm compensating for them. Whatever....I'm just glad there K3
> has that nice EQ!
> N4LQ
>
> Steve Ellington
> [hidden email]

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[Jim Brown-10]

On Sun, 25 May 2008 09:14:15 +0100, David Cutter wrote:

>I'm not familiar with SR5, but the peak at 1600Hz MAY be deliberate:  this
>has been used by some to increase readability in voice channels, though, not
>sure if this is good in the presence of high noise as on HF.

See http://audiosystemsgroup.com/HamInterfacing.pdf 

and the Chapter on "Solving Problems in the Shack" in

http://audiosystemsgroup.com/RFI-Ham.pdf

73,

Jim K9YC


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[Barry N1EU]

My guess is that the lack of flatness in your passband is normal sample variation in the 2.7Khz roofing filter.

73,
Barry N1EU

n4lq wrote

Someone kindly mentioned SR5 here so I downloaded it and observed that my
audio from the K3 had a pronounced peak around 1600 Hz. I compensated for
this by adjusting the K3's RX equalizer so that EQ (6) is -4db, EQ (7)
is -4db and EQ (8) is -2db. I now have a flat response across the spectrum.
QRN is less distracting now. Also, my waterfall on MIxw is nice and even all
the way across now. This isn't very scientific. I was just using band noise
to adjust the EQ for a flat response but since band noise is what I'm
dealing with, I felt it was adequate.
Question is: Has anyone else noticed this? Do you think it's something to do
with filter shape? Maybe the audio amp. is indeed flat but the filters
aren't and I'm compensating for them. Whatever....I'm just glad there K3 has
that nice EQ!
N4LQ

Steve Ellington
[e-mail]

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