K3 Notch causes distortion on SSB RX

[k5oai]

I am noticing a bit of distortion on SSB signals when I enable the AUTO
Notch. Is there some setting I can change to eliminate the distorted
sound I am hearing now?
--
GB & 73
K5OAI
Sam Morgan
______________________________________________________________
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
Message delivered to [hidden email]

[Dick Dickinson]

What type of distortion are you hearing?

 

Dick - KA5KKT

  _____  

I am noticing a bit of distortion on SSB signals when I enable the AUTO

Notch. Is there some setting I can change to eliminate the distorted

sound I am hearing now?

--

GB & 73

K5OAI

 

______________________________________________________________
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
Message delivered to [hidden email]

[Bill-3]

Hello Sam in Ole Angelo,

The distortion you are noticing is very real and has bothered me to no
end. It is discussed on a couple of websites, that I am sure the
"experts" will jump in and tell you all about.

I did some research on the subject and a lot of experimentation. I
eventually found the distortion can be reduced (or enhanced if you like
being annoyed) by changing the menu values of AGC SLP. I have mine set
at 6 and it makes the warble of the ANF (Automatic Notch Filter) - far
less than the 12 default setting. Some of my other menu settings (for
the arm chair copy user) can be found at: http://www.w2blc.net/K3.htm

I am sure others can expound upon the whys and wherefores of the
software anomaly that causes this annoyance. Suffice to say, invoking
the ANF on my other rigs does not cause distortion on received signals.

As always, your mileage may vary.

Bill W2BLC K-Line


______________________________________________________________
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
Message delivered to [hidden email]

[k5oai]

hard to describe, it's like the audio is getting chopped up, not sure
this would explain it, but it's kind of like the sound of someone
gargling being overlayed over the  signal audio. A combination of that
and the sound of NR @ 5-1.

if the band is very quiet and the signals strong it's very pronounced,
if the band is noisy it's not as pronounced

On 7/28/2014 7:52 PM, Dick Dickinson wrote:
> What type of distortion are you hearing?
> Dick - KA5KKT
>
==
> I am noticing a bit of distortion on SSB signals when I enable the AUTO
>
> Notch. Is there some setting I can change to eliminate the distorted
>
> sound I am hearing now?
>

--
GB & 73
K5OAI
Sam Morgan
______________________________________________________________
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
Message delivered to [hidden email]

[Gary Gregory-2]

Bill

I have found if i am trying to remove Cw i can use manual notch set to the
signal and it seems the distortion fades away.
I gave up using both auto-notch and NR on the k3

Gary
Vk1ZZ
K3, KX3, KPA500-FT, KAT500-FT,P3.
On 29/07/2014 11:06 AM, "Bill W2BLC" <[hidden email]> wrote:

> Hello Sam in Ole Angelo,
>
> The distortion you are noticing is very real and has bothered me to no
> end. It is discussed on a couple of websites, that I am sure the "experts"
> will jump in and tell you all about.
>
> I did some research on the subject and a lot of experimentation. I
> eventually found the distortion can be reduced (or enhanced if you like
> being annoyed) by changing the menu values of AGC SLP. I have mine set at 6
> and it makes the warble of the ANF (Automatic Notch Filter) - far less than
> the 12 default setting. Some of my other menu settings (for the arm chair
> copy user) can be found at: http://www.w2blc.net/K3.htm
>
> I am sure others can expound upon the whys and wherefores of the software
> anomaly that causes this annoyance. Suffice to say, invoking the ANF on my
> other rigs does not cause distortion on received signals.
>
> As always, your mileage may vary.
>
> Bill W2BLC K-Line
>
>
> ______________________________________________________________
> 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
> Message delivered to [hidden email]
>

______________________________________________________________
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
Message delivered to [hidden email]

[Dick Dickinson]

I suspect, as Bill has suggested, it is AGC related.

 

Dick - KA5KKT

  _____  

hard to describe, it's like the audio is getting chopped up, not sure

this would explain it, but it's kind of like the sound of someone

gargling being overlayed over the  signal audio. A combination of that

and the sound of NR @ 5-1.

 

if the band is very quiet and the signals strong it's very pronounced,

if the band is noisy it's not as pronounced

 

______________________________________________________________
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
Message delivered to [hidden email]

[Phil Wheeler-2]

At time like this I appreciate having
"non-critical" hearing capability (deaf in one
ear, ringing in both). My K3 sounds great under
all conditions -- and no fan I have makes any
noise :-)

Phil W7OX

On 7/28/14, 6:05 PM, Bill W2BLC wrote:

> Hello Sam in Ole Angelo,
>
> The distortion you are noticing is very real and
> has bothered me to no end. It is discussed on a
> couple of websites, that I am sure the "experts"
> will jump in and tell you all about.
>
> I did some research on the subject and a lot of
> experimentation. I eventually found the
> distortion can be reduced (or enhanced if you
> like being annoyed) by changing the menu values
> of AGC SLP. I have mine set at 6 and it makes
> the warble of the ANF (Automatic Notch Filter) -
> far less than the 12 default setting. Some of my
> other menu settings (for the arm chair copy
> user) can be found at: http://www.w2blc.net/K3.htm
>
> I am sure others can expound upon the whys and
> wherefores of the software anomaly that causes
> this annoyance. Suffice to say, invoking the ANF
> on my other rigs does not cause distortion on
> received signals.
>
> As always, your mileage may vary.
>
> Bill W2BLC K-Line

______________________________________________________________
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
Message delivered to [hidden email]

[Joe Subich, W4TV-4]

what you hear is a fast time constant on the auto notch.  The
faster time constant makes the notch respond faster but it also
allows it to attack "purer" tones in the audio.  The effect is
more noticeable on strong signals with flat AGC curves where
all frequencies in the audio passband are of similar levels.

The effect is a result of the design decisions made by the DSP
programmer - a tradeoff between notch effectiveness and fidelity.

73,

    ... Joe, W4TV


On 2014-07-28 9:11 PM, Sam Morgan wrote:

> hard to describe, it's like the audio is getting chopped up, not sure
> this would explain it, but it's kind of like the sound of someone
> gargling being overlayed over the  signal audio. A combination of that
> and the sound of NR @ 5-1.
>
> if the band is very quiet and the signals strong it's very pronounced,
> if the band is noisy it's not as pronounced
>
> On 7/28/2014 7:52 PM, Dick Dickinson wrote:
>> What type of distortion are you hearing?
>> Dick - KA5KKT
>>
> ==
>> I am noticing a bit of distortion on SSB signals when I enable the AUTO
>>
>> Notch. Is there some setting I can change to eliminate the distorted
>>
>> sound I am hearing now?
>>
>

______________________________________________________________
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
Message delivered to [hidden email]