[Elecraft] MCU 4.51, any affect on APF ?

[Keith Heimbold]

I was using the CWT decode functionality this weekend and still notice a decreased sensitivity or ability to decode but with a little tweaking I was able to get it to function. It may not be as good as previously but it still works fairly well.  I am glad that Wayne and crew are looking into this.

Keith
AG6AZ

Sent from my iPhone please excuse typos

On May 28, 2012, at 12:58 PM, "Joe Subich, W4TV" <lists at subich.com> wrote:

> 
> Wayne,
> 
> This may be entirely dependent on signal level vs. AGC threshold.
> 
> Prior to MCU 4.5x APF was generally working with signals that had
> already activated the AGC thus the peaking occurred above the
> threshold/slope.  With the higher threshold, the noise is not held
> to a well defined level so the effect of the APF may not be as
> pronounced for signals below the threshold.
> 
> The same issues are probably involved with the perceived CW decode
> issues.  It is no longer sufficient to simply set threshold to auto
> and turn on decode.  Now it can require some tweaking of the decode
> threshold as well as frequency and bandwidth to get good decoding.
> 
> 73,
> 
>    ... Joe, W4TV
> 
> 
> On 5/28/2012 11:20 AM, Wayne Burdick wrote:
>> We'll be doing careful measurements of APF pre-/post-4.51 this week.
>> There was no intentional change to it, and to me, at least, it still
>> sounds the same.
>> 
>> Wayne
>> N6KR
>> 
>> On May 27, 2012, at 8:31 PM, Bob K6UJ wrote:
>> 
>>> Can anyone give me feedback on 4.51 for the K3 as far as affecting
>>> the APF on CW sigs ?
>>>> From what I've read so far the NB and NR are enhanced, I was
>>>> wondering if it has any affect on the APF.
>>> 
>>> 
>>> tnx,
>>> 
>>> Bob
>>> K6UJ
>>> 
>>> 
>>> 
>>> 
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