ANF update?

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  • Updated 2 months ago
Just curious if the next version of SSDR will finally fix the non-working ANF. Steve told me at HAMCOM in Plano this past June, that a new developer had been hired. And one of his tasks would be to finally fix ANF. I sure hope so.
James
WD5GWY
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James Whiteway

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Posted 2 months ago

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Wayne

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You know you dont have to ask dear, the answer is "NO! " famous words of adivice from xyl.
(Edited)
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James Whiteway

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Ughhhh, Ok Wayne. :-)
Not exactly encouraging there!
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Bill -VA3WTB

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I think Wayne is just joking with you, Flex has said a few times they plan to do more work on the noise filters. Just have to wait for it. And they are not as bad as some make them out to be.
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James Whiteway

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Bill, did you see the smiley in my post?
:-)
I knew he was joking. And even though you don't believe it, the ANF is as bad as many people, not some, make it out to be.
That you are content with it's current level of performance is fine. But, there are others, including myself, find the current ANF lacking. Even Steve Hicks says it needs improvement. If FRS's top engineer says it needs improvement, what does that tell you? FRS has gone so far as to hire another developer tasked with fixing the ANF. Why is that, if it's not all that big of an issue?
I am glad the current version works fine for you. But, don't belittle those of us who do have less than satisfactory results with the current state of the ANF in SSDR.
"Breaking new ground " as you've stated in the past is not the reason this issue has gone on for so long. My thoughts on that is FRS has had limited resources (developers) to devote to fixing basic issues. And has chosen to focus on Contesters for sales and adding features they and DX'ers, want in order to promote income. Which is fine and dandy. But, doesn't help all their user base. Now, with new talent on the team, maybe things that are important to the rest of their customers, will finally be fixed.
James
WD5GWY
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Craig Williams

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Wow! I was just remarking to myself the other day how good the ANF worked.
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Burch - K4QXX

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I find the ANF on my 6700 works great as long as the carrier is not on top of a QSO.  It takes 100% of the carrier out but if on top of a QSO with a strong station, it pumps and doesn't do a very good job. 
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James Whiteway

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My 6600M does exactly the same. No QSO just someone tuning up, it takes the tone completely out.
But, on top of a QSO, forget about it. Every syllable spoken has the tone popping right thru it.
Makes listening to a net almost impossible. None of my other radios with a Notch Filter exhibit this behavior. That's why, I keep this subject alive.
It simply amazes me that PowerSDR with the older radios, does not have this issue. Yet, it exists in a much more powerful and expensive radio from the same manufacturer.
James
WD5GWY
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Ken - NM9P, Elmer

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I don't use ANF much.  The problem with ANF, it seems to me, is that the "detection/recalculation time parameter" (my made-up layman's terminology) is too short, and it tends to "pump" the carrier if the desired SSB signal is strong.  It also adds some distortion to the SSB audio.

Fortunately, there is another, very effective option... the TNF. 
I just zoom in a bit and quickly drop a TNF on the offending carrier.  I can drop multiple TNF's in a SSB bandwidth if there are multiple interfering carriers, and can adjust depth and width for each one as needed.  If a carrier moves, I can quickly drag it to the new place.

TNF adds no distortion to the SSB audio, other than the obvious missing frequencies.  It can remove very strong offending signals, and is more effective than most other options I have seen so far.  The ability for multiple filters is great.

I am awaiting FRS's next science project for DSP.  There have been a lot of great developments posted on the web recently, and I am hoping that FRS will be able to implement some of them in the near future.  Time will tell.....

In the mean time....I can tweak the other options and get excellent copy most of the time...

Ken - NM9P
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Bill -VA3WTB

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It took 6 years to get ANF at all in PSDR
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James Whiteway

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Ken, I agree about using tracking notch filters. But, try it with the Maestro or the M model radios. Not an easy task.
So Bill, you think it should take another 6 years to get a working ANF in SSDR? How many version upgrades did you pay for in PSDR before getting it? Not a single one.
My bet is if it takes 6 years to get a working ANF there will be another paid upgrade to go thru by then.
Fortunately, I know pretty well from my talk with Steve, that it won't be 6 years or having to pay to get a working ANF. By version 2.4.x we should finally have one. That's from someone who knows.
I'm not worried it won't happen. I'm looking forward to when it happens. Then, I can sell some radios that already have a good, working, ANF and enjoy my 6600M even more.
James
(Edited)
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Jim KJ7S

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I have to agree, to a point, that the ANF needs to be worked on. However, as an alternative, and I use this all the time instead of the ANF, the TNF which takes out ANY needed 'Zone', is fully variable, AND, you can put as many as needed in the given passband to take out any and all offending carriers. Granted it takes a little effort to set and initiate the suppresion, but it works, and a heck of a lot better than the ANF does.
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James Whiteway

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Try that with a Maestro or the M models in stand alone mode. By the time you fiddle with all that, the station you want to hear will have faded out or given up on you in frustration.