K3 audio response, big roll off observed

[on4iq]

Hi all,
wonder if anyone can help me out.
K3 audio frequency response in SSB or DATA mode has with flat EQ hughe rolloff.
on the range 500-4000Hz there is 37dB roll off !

Bandwidth is set to 4KHz.
Any ideas to what might be the cause?
Measured with spectrum labs,
screen dump is to be found here :  https://www.dropbox.com/s/2nd7axi6ic2osd6/Schermafdruk%202015-12-22%2010.24.04.png?dl=0

[Mike Harris-9]

Can't see your dropbox offering. What roofing filter are you listening
through? Whilst you can set the DSP filter to 4kHz if you are listening
through a 2.7kHz roofing filter that is what you are going to get.

Regards,

Mike VP8NO

On 22/12/2015 06:26, on4iq wrote:

> Hi all,
> wonder if anyone can help me out.
> K3 audio frequency response in SSB or DATA mode has with flat EQ hughe
> rolloff.
> on the range 500-4000Hz there is 37dB roll off !
>
> Bandwidth is set to 4KHz.
> Any ideas to what might be the cause?
> Measured with spectrum labs,
> screen dump is to be found here :
> https://www.dropbox.com/s/2nd7axi6ic2osd6/Schermafdruk%202015-12-22%2010.24.04.png?dl=0

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[on4iq]

Listening via 6Khz filter
there is 15k 6k 2.8k installed
I just tried to listen in FM, useless, cut audio off above 3Khz even in wide filter setting
image shows roll off with flat EQ

[Joe Subich, W4TV-4]

That looks like an issue with your sound card (6 dB/octave roll-off).
Check with a different sound card/cables.

73,

   ... Joe, W4TV


On 12/22/2015 8:48 AM, on4iq wrote:

> Listening via 6Khz filter
> there is 15k 6k 2.8k installed
> I just tried to listen in FM, useless, cut audio off above 3Khz even in wide
> filter setting
> image shows roll off with flat EQ
>
> <http://elecraft.365791.n2.nabble.com/file/n7611715/Schermafdruk_2015-12-22_10.png>
>
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/K3-audio-response-big-roll-off-observed-tp7611712p7611715.html
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[Arie Kleingeld PA3A-2]

K3 #1255 with all mods: response as flat as a pancake up till 4 kHz.
(line-out into pc-soundcard)

73
Arie PA3A

Op 22-12-2015 om 14:56 schreef Joe Subich, W4TV:

>
>
> On 12/22/2015 8:48 AM, on4iq wrote:
>> Listening via 6Khz filter
>> there is 15k 6k 2.8k installed
>> I just tried to listen in FM, useless, cut audio off above 3Khz even
>> in wide
>> filter setting
>> image shows roll off with flat EQ
>>

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[on4iq]

Problem solved.
Faulty Phone connection on back of rig.
Line and speaker OK
Might need to replace the part on the PCB.

Johan

[Jim - N4ST]

Well, the phone jack outputs do have 0.1uF capacitors to ground.  Depending
on the input impedance of your measurement device, there could be a
substantial roll-off.

__________
73,
Jim - N4ST

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of on4iq
Sent: Thursday, December 24, 2015 09:33
To: [hidden email]
Subject: Re: [Elecraft] K3 audio response, big roll off observed

Problem solved.
Faulty Phone connection on back of rig.
Line and speaker OK
Might need to replace the part on the PCB.

Johan



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