[Elecraft] k3 NR Audio level increase

[Steve Ellington]

So where's the problem? Everything seems to be working properly.  With a 
high THR and low SLP, louder signals are LOUD and NR just helps make it more 
obvious because there's not so much noise to distract your hearing. 
Remember, AGC used to be called AVC Automatic Volume Control, back in the 
old days. If you choose a high threshold, THR, that means that AVC does 
almost nothing. AVC becomes MVW, manual volume control, ....Meaning knobs 
must be turned (AF).
Steve Ellington
N4LQ at carolina.rr.com
----- Original Message ----- 
From: "Joe Planisky" <jplan at jeffnet.org>
To: "W7TEA" <gtuck at mac.com>
Cc: <elecraft at mailman.qth.net>
Sent: Saturday, April 25, 2009 1:22 PM
Subject: Re: [Elecraft] k3 NR Audio level increase


> Good catch, Gary. AGC settings are the missing piece and probably why
> some people aren't seeing this.  With an S9 signal, NR=F4-4, BW=2.00,
> I get the following results for different settings of AGC THR and AGC
> SLP when NR is engaged:
>
> THR=2, SLP= 0 +10.0 dB
> THR=2, SLP= 5 + 2.7 dB
> THR=2, SLP=10 - 6.0 dB
> THR=2, SLP=15 -15.5 dB
>
> THR=4, SLP= 0 +15.2 dB
> THR=4, SLP= 5 + 9.6 dB
> THR=4, SLP=10 + 3.6 dB
> THR=4, SLP=15 - 3.8 dB
>
> THR=6, SLP= 0 +16.6 dB
> THR=6, SLP= 5 +13.3 dB
> THR=6, SLP=10 + 7.9 dB
> THR=6, SLP=15 + 1.5 dB
>
> THR=8, SLP= 0 +18.3 dB
> THR=8, SLP= 5 +15.6 dB
> THR=8, SLP=10 +11.7 dB
> THR=8, SLP=15 + 7.0 db
>
> 73
> --
> Joe KB8AP
>
>
> On Apr 25, 2009, at 8:21 AM, W7TEA wrote:
>
>>
>> Joe, following your instructions, I cannot duplicate this on my rig
>> listening to a S-9 signal.  I do find that if AGC-THR is set
>> below 5, the audio drops significantly when initiating NR at
>> my preferred setting, 2-1.  Decreasing the AGC SLP increases
>> the audio with NR engaged.
>>
>> Gary W7TEA
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