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K3 AGC usage question

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Mike Reublin

K3 AGC usage question

When I turn the AGC off, my audio sounds like the speaker cone is torn,
either the external speakers or phones. It's very difficult to describe.

I made a .wav file using Windows recorder, with the mic held in front to
my external speakers. It's a CW signal, with the 250Hz roofing filter.
It starts with AGC on, then off then on again. It's roughly an S4 signal
and S4 noise. I reduced the RF gain to aboyt 3 o'clock.

If someone can tell me how to make a better recording. please do.

Listen here. http://nf4l.com/k3agc.htm

Am I doing something wrong, or do I have a rig problem?

Thanks,

Mike NF4L

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KK7P

Re: K3 AGC usage question

Mike wrote:
> When I turn the AGC off, my audio sounds like the speaker cone is torn,
> either the external speakers or phones. It's very difficult to describe.

CONFIG: AF LIM is used to hard limit the audio level so you don't get
"blasted" by a strong signal when you have the gain cranked up to hear a
weak one with AGC OFF. This is only in effect with AGC OFF.

73,

Lyle KK7P
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Mike Reublin

Re: K3 AGC usage question

AF LIM is set to 12. Shouldn't that be enough?

I wouldn't characterize the signal as strong. It doesn't make any
difference what the AF gain is, as long as it's loud enough to hear.
Even the beep when I turn AGC back on is raspy.

I'm not trying to be argumentative, just trying to get a handle on
whether it's pilot error or something else. And how to fix it either way.

Mike

Lyle Johnson wrote:

> Mike wrote:
>> When I turn the AGC off, my audio sounds like the speaker cone is
>> torn, either the external speakers or phones. It's very difficult to
>> describe.
>
> CONFIG: AF LIM is used to hard limit the audio level so you don't get
> "blasted" by a strong signal when you have the gain cranked up to hear
> a weak one with AGC OFF. This is only in effect with AGC OFF.
>
> 73,
>
> Lyle KK7P
>

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Mike Reublin

Re: K3 AGC usage question

In reply to this post by Mike Reublin

Thanks, Steve.

I ran it from 12 up to 24. That seems to have cleaned it up FB. I had in
my mind it worked the other way.....

73, Mike

Steve Ellington wrote:

> Go into the Config menu and crank up the AF Limit some. It's working
> correctly but just turned up too high.
>
> Steve
> N4LQ
> [hidden email]
> ----- Original Message ----- From: "Mike" <[hidden email]>
> To: <[hidden email]>
> Sent: Sunday, January 10, 2010 10:25 AM
> Subject: [Elecraft] K3 AGC usage question
>
>
>> When I turn the AGC off, my audio sounds like the speaker cone is torn,
>> either the external speakers or phones. It's very difficult to describe.
>>
>> I made a .wav file using Windows recorder, with the mic held in front to
>> my external speakers. It's a CW signal, with the 250Hz roofing filter.
>> It starts with AGC on, then off then on again. It's roughly an S4 signal
>> and S4 noise. I reduced the RF gain to aboyt 3 o'clock.
>>
>> If someone can tell me how to make a better recording. please do.
>>
>> Listen here. http://nf4l.com/k3agc.htm
>>
>> Am I doing something wrong, or do I have a rig problem?
>>
>> Thanks,
>>
>> Mike NF4L
>>
>> ______________________________________________________________
>> 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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