K3 AGC Adjustment Parameters

[dhhdeh]

Hi Everyone,

While only my second post to the reflector, I have read everything about the K3 here since last May. I have my K3 order in queue in the second run in November.

First to Eric, Wayne and all at Elecraft, my hearty congratulations on the birthing of the K3 this week.  If the User Manual is representative of the tranceiver, this is going to be one fine journey ahead for us all.

But I need some enlightenment.  In reading the FAQ's concerning the AGC parameters of the K3, I found the following discussion:

"Are the settings variable in terms of attack, hang, and decay?
In the menu, you can set the following parameters for AGC:  Attack time, Hold (Hang) time, Decay rate (in dB/sec for Fast and Slow), Threshold, and Slope. Slope sets the compression you get from AGC, whether you like everything above the threshold to be flat (S4 and 40 over S9 are the same level) or some sort of slope (2:1, 10:1 whatever) so stronger signals are somewhat louder."
In the User Manual under the program menus on page 50, I only see adjustable AGC paramenters for Hold, Pulse and Slope.  Nothing on adjusting the 'attack time', 'decay rate' or 'threshold'.
Did I miss something elsewhere in the manual or am I misinterpreting something?
Any clarification would be appreciated. Thanks in advance.
Now...Wayne and Eric, et. al.  ...bring on that K3 panadaptor and especially that KPA800 Linear!
73 de N1LQ-Dave
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[Vic K2VCO]

[hidden email] wrote:

> But I need some enlightenment.  In reading the FAQ's concerning the
> AGC parameters of the K3, I found the following discussion:

> "Are the settings variable in terms of attack, hang, and decay? In
> the menu, you can set the following parameters for AGC:  Attack time,
>  Hold (Hang) time, Decay rate (in dB/sec for Fast and Slow),
> Threshold, and Slope. Slope sets the compression you get from AGC,
> whether you like everything above the threshold to be flat (S4 and 40
>  over S9 are the same level) or some sort of slope (2:1, 10:1
> whatever) so stronger signals are somewhat louder."

> In the User Manual under the program menus on page 50, I only see
> adjustable AGC paramenters for Hold, Pulse and Slope.  Nothing on
> adjusting the 'attack time', 'decay rate' or 'threshold'.

> Did I miss something elsewhere in the manual or am I misinterpreting
> something?

The other parameters were there in early beta versions of the firmware,
but were removed for production. I believe (but you will have to get
this from the horse's mouth) that it was found possible to optimize
these settings, so they didn't need to be adjustable.

I know, for example, that the attack time was originally adjustable so
that you could set it to ignore short noise pulses. But since then, the
AGC Pulse function was implemented to deal with this, and so the attack
can be as short as possible for best performance.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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[Greg - AB7R]

When Wayne decided to remove these menu items he also mentioned that if there was a need
he could put them back.  None of the field testers seemed to have missed them however.

-------------------------
73,
Greg - AB7R
Whidbey Island WA
NA-065
K3#0009

On Thu Oct 11 16:49 , Don Rasmussen  sent:

>I don't know about anyone else, but I bought K3 based
>on being able to adjust these (5) things. Even if they
>can be "optimized", I WANT to be able to set these for
>my preference as advertised.
>
>Attack - Hold - Decay - Threshold - Slope.
>
>All of these have meaning to me.
>
>If any of these are not really available or do not
>work as advertised I'll be majorly bummed.
>
>
>[Elecraft] K3 AGC Adjustment Parameters
>Vic K2VCO vic at rakefet.com
>Thu Oct 11 14:32:33 EDT 2007
>
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>--------------------------------------------------------------------------------
>
>dhhdeh at comcast.net wrote:
>
>> But I need some enlightenment.  In reading the FAQ's
>concerning the
>> AGC parameters of the K3, I found the following
>discussion:
>
>> "Are the settings variable in terms of attack, hang,
>and decay? In
>> the menu, you can set the following parameters for
>AGC:  Attack time,
>>  Hold (Hang) time, Decay rate (in dB/sec for Fast
>and Slow),
>> Threshold, and Slope. Slope sets the compression you
>get from AGC,
>> whether you like everything above the threshold to
>be flat (S4 and 40
>>  over S9 are the same level) or some sort of slope
>(2:1, 10:1
>> whatever) so stronger signals are somewhat louder."
>
>> In the User Manual under the program menus on page
>50, I only see
>> adjustable AGC paramenters for Hold, Pulse and
>Slope.  Nothing on
>> adjusting the 'attack time', 'decay rate' or
>'threshold'.
>
>> Did I miss something elsewhere in the manual or am I
>misinterpreting
>> something?
>
>The other parameters were there in early beta versions
>of the firmware,
>but were removed for production. I believe (but you
>will have to get
>this from the horse's mouth) that it was found
>possible to optimize
>these settings, so they didn't need to be adjustable.
>
>I know, for example, that the attack time was
>originally adjustable so
>that you could set it to ignore short noise pulses.
>But since then, the
>AGC Pulse function was implemented to deal with this,
>and so the attack
>can be as short as possible for best performance.
>--
>73,
>Vic, K2VCO
>Fresno CA
>http://www.qsl.net/k2vco
>
>
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>You must be a subscriber to post to the list.
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>
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