Tone oscillator with APF slider 2...6

Sergey R5AU

Ver 1.4, in CW mode when APF on, and APF slider between 2 and 6, generating parasitic tone
F6700
Win10 Technical Preview

Paul Christensen, W9AC

Yes, I can confirm Sergey's finding on APF. 

Paul, W9AC

Tim - W4TME

I have enter this report into our bug tracker for further investigation.  Please report any additional information related to this specific issue in this community topic.

Rick Hadley - W0FG

Aside from the above problem, which I have also observed, the APF also doesn't seem to increase in effectiveness as the slider is advanced past the point where the parasitic stops.

Steve N4LQ

Same here with WIN 8 but 4 and 6 are just dead audio while 2, 3 and 5 are tones. 
Actually the tone could come in handy as a spotter. Maybe ...Click once for APF and twice for tone? 

Al_NN4ZZ

Sergey,
Here is what I'm seeing on a 6700 and Win7

APF = 1  it appears to be working and helps pull out the CW Signal
APF = 2 tone
APF = 3 tone
APF = 4 dead, no audio
APF = 5 tone
APF = 6 dead no audio
APF = 7 thru 100 signal reappears but APF is not longer effective.  Sounds the same on or off.



APF = 1 is the only value that seems to work at all.

Can anyone else confirm that APF works when set to 1?





Regards, Al / NN4ZZ  
al (at) nn4zz (dot) com

Sergey R5AU

Al, in case more precisely listening i am agree with :
APF = 2 tone
APF = 3 tone
APF = 4 dead, no audio
APF = 5 tone of the High Freq + air with tone level go smoothly to zero - dead after couple of sec.
APF = 6 dead no audio
however from 7 to 99 i am hearing real increasing of the Q of the APF filter, my preset as it was on 1.3.8 is 20 with both sliders of the EQ 600Hz+1kHz - +9DB and other with -9DB


P.S. with position 5 very vary from time to time

Al_NN4ZZ

With V1.38 my APF setting was between 20 & 30.  Also filter is 100 HZ, tone is 600 HZ and equalizer is set similar to yours (500 + 1K up, all others down)

With V1.4 there is no beneft for any APF setting between 7 - 100

What do you see when the APF setting is 1 ?

Regards, Al / NN4ZZ  
al (at) nn4zz (dot) com

Sergey R5AU

with setting 1 i listen somehow ~ +10db signal amplification without Q effect of he APF

Sergey R5AU

In couple of minutes will be accessible short movie on http://youtu.be/ckuK_IFdUzM
with APF issue 

Al_NN4ZZ

Sergey,
Okay after more testing with wider filters I am seeing some Q effect at the settings between 7 & 100.  It's not very pronounced -- the signal doesn't really pop.   There is an idea to boost the gain for APF so maybe that is part of the reason.

https://community.flexradio.com/flexradio/topics/ssdr_v1_2_apf_could_use_more_gain_it_seems_diminish...

Also agree with your assessment of APF = 1.   With a narrow filter (100HZ or 50HZ) it seems like there is some Q effect but it may just be because the filter is narrow and the signal is boosted overall. 

What filter width are you typically using?   Do you still see an improvement when with narrow filters?

Overall, APF still need work IMHO.

Regards, Al / NN4ZZ  
al (at) nn4zz (dot) com

Sergey R5AU

Usually 400Hz or 250Hz, on movie 400Hz

You know definitely in ver 1.2 effect was WOW, but in other way around Steve is also right, necessary to define what really better(type of APF), i remember he replyed in some message after you post, sorry but not remember when it was

Al_NN4ZZ

Movie shows the tone problem well.  

When you have APF set to somewhere around 30, it would be good to see when you enable / disable APF button if there is a noticeable difference. 

Also whether the effect is the same when using a 100 HZ filter.

Regards, Al / NN4ZZ  
al (at) nn4zz (dot) com

Sergey R5AU

It is true Al, between 20 and 30 are usefull settings of APF