SSDR V1.2 - APF could use more gain - it seems diminished from the alpha version

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  • Updated 3 years ago
The APF gain in V1.2 seems to be less pronounced than in the alpha version I tested.  The Q slider is working fine but the gain appears diminished and the overall effect appears to be smaller.  Is it possible that some of the other changes in DE 1727 (for the filter and crackling) have affected it?

I would like to submit this idea again for consideration.  Add a new slider to allow the user to adjust the gain to their liking.  I think it would allow us to adjust it per band conditions and personal preference.  

See suggested changes below....

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





 
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Al / NN4ZZ

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Posted 6 years ago

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Photo of Paul Christensen, W9AC

Paul Christensen, W9AC, Elmer

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Great idea, Al.  The current APF control reasonably adjusts bandwidth (Q) but a gain control would make the APF function ideal on CW.
(Edited)
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Al / NN4ZZ

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V1.4 introduced some issues with APF.  Here is a link to that thread.

https://community.flexradio.com/flexradio/topics/tone-oscillator-with-apf-slider-2-6?topic-reply-lis...

In case FRS decides to fix the new APF problems in a V1.4.x point release, maybe they will consider adding the GAIN feature at the same time.

Add your comments and votes here if you agree.....

Regards, Al / NN4ZZ  
al (at) nn4zz (dot) com
 
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Barry N1EU

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What OpenHPSDR doesn't quite have right IMHO is allowing bandwidth to increase wide enough to use APF on ssb.  Ten-Tec Orion got that right.
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Ed - W2RF

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OpenHPSDR doesn't have the CW panorama feature of TenTec either, another desirable feature.
(Edited)
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Al / NN4ZZ

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Hi Ed,
Thanks for sharing the HPSDR control.  I've never seen it before but it looks like it might be ever better.  

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

 
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Ned K1NJ

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    APF Effectiveness seems greatly diminished.  Acts like a 50 Hz filter kicks in
without audio peaking.   The 1.38 APF was a valuable feature and so was
having the choice between weighted and non-weighted averaging.

Ned,  K1NJ
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Ned K1NJ

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   Have to correct myself.  I first thought that the "standard" averaging had
been removed because the "weighted" on/off switch seemed to have no
effect.  Last night I went to 160m where there is some very bad impulse
type noise, and saw that averaging in the normal mode had a huge effect
there and had certainly not been removed.  The weighted average mode
sees fast rise time of noise as well as signals, and nowhere is it more apparent
at my station than on 160m.  40 dB noise pulses that were much-reduced by
the "normal" averaging, were horrendous using weighted averaging, proving
that both were working.
   However, some change seems to have been made in the averaging process.
Perhaps the averaged period was changed from previous versions.  Whatever
the case may be, however, it is working- just a little differently.

Ned,  K1NJ