[Elecraft] APF re-check: Rev. 4.17 vs. 4.25 (no difference found)

[goldtr8 at charter.net]

I am not smart enough to comment regarding the real stuff going on 
behind the sceines in the code.

However, since the new update the NR and NB pretty much take care of my 
Plasma TV noise.

So there is something that changed in the combination and I say thanks 
for this improvement.

Don
KD8NNU


On Fri, Jan 28, 2011 at 11:57 AM, Wayne Burdick wrote:

> Lyle (KK7P), our DSP engineer--a very meticulous guy--just did a very 
> careful re-test of the two versions of code referred to in this 
> thread. He found no difference between 4.17 and 4.25.
>
> I see that Arie (PA3A) also confirmed no difference when he repeated 
> his own test. (Thanks for doing this, Arie.)
>
> 73,
> Wayne
> N6KR
>
>
> On Jan 28, 2011, at 2:51 AM, Arie Kleingeld PA3A wrote:
>
>> All,
>>
>> Measured the two FW's 4.17 and 4.25 with APF on S+N/N ratio at MDS
>> again, and again.
>> Question was: if the filter plots are exactly the same, where does 
>> the
>> measured (marginal) difference of 2 dB come from?
>>
>> Found no difference this time. Seems that the XG2 drifted a bit in
>> yesterdays measurements which, I think,  caused the 2dB difference
>> (despite tuning the K3 on the right freq before measurement started).
>>
>> Positive thing is that I could measure the improvement of S+N/N ratio
>> with the APF switched on. Even with the 200Hz roofer and 50Hz DSP BW 
>> it
>> adds a few dB. So for me it is a good tool for digging holes in the
>> noise looking for weak signals.
>>
>> 73,
>> Arie PA3A
>>
>>
>>
>>
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