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DSP - ANF Performance Specification
The community has many discussions about the SSDR DSP functions and many of these are qualitative posts saying that ANF, for instance, needs to be fixed. How about tightening focus?
So, lets take ANF. For me it seems to work okay and not having anything to compare I’m satisfied. But then I’m mostly on CW. Nevertheless, what exactly is the spec for the ANF? We have a sense of what it is supposed to do, but within what limits? Its a software subsystem tightly integrated into SSDR so Flex must have some specs to test their design. That spec they must hold close to not reveal intent and there isn’t much detail in paragraph 15.4 of the users guide nor specific performance specs.
That said, you can’t fix that which you cannot measure. We all know this.
Here’s an attempt at a provisional ANF performance spec, ultimately, in some fashion a “users’” desired specification:
Modes of operation: SSB, AM
Attenuation of interfering audio tone: 30 – 50dB
Effect on desired signal in passband: ? %THD?
Number of simultaneous tones notched in the passband: 5
Passband effectiveness: 1.8 to 5 khz
Number of slices using ANL: 1 to 8
Attack time: less than 100 msec
Effect on slice noise floor: none seen on spectrum
Effect on slice IMD: none (how to measure)
Then, measure SSDR with with our “users’” specification? These are sort of in order, my order, of importance. Users might consider more or less spec items. Users might consider different required values. Quantitative results might be a challenge.
All of the above is my idea of what to measure, I’m certain it can be improved.
By looking closely at the ANF’s desired spec a technical discussion can be had that may in fact be useful to Flex engineering. There are no hardware limitations as far as I know.
My thought is to move away from Flex flogging and into the tech specifics that we hams can debate. Field performance of the ANF (also for any comparable rig) can be measured using user accepted provisional specs as a grading rubric. Getting to this point is not easy in a public forum, but, perhaps it needs to be done to move forward.
Similar quantitative specs and answers for NB. NR and WNB could be considered.
So, for ANF, what exactly is it that we want?
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