http://elecraft.85.s1.nabble.com/K3-noise-reduction-performance-tp5779574p5780133.html
careful adjustments. Try F7 through F8 settings and I also have to adjust
Hi/Lo settings to improve readability of the audio. You can often reduce
the watery effect and greatly improve overall readability on a noisy night.
Doesn't work all the time -- depending on QRN conditions. I would say about
the noise is high. You're not trying to achieve best fidelity with this
> I'm still getting my sea legs on the K3 but NR seems to work really great
> on CW but on SSB, I can't use it. With it on, regardless of setting, it
> makes the channel sound "watery" (for lack of a better term). I have two
> K3s, and both sound alike on phone with NR invoked. Maybe I don't have
> them adjusted properly, but I find the sound very disconcerting.
>
> Rob K6RB
>
>> Hello Elecrafters,
>>
>> Regarding the issue of NR, I know this can be a touchy subject and most
>> will
>> say its very subjective. This post isn't intended as a complaint or
>> criticism. Instead, I hope through constructive discussions, more
>> improvements to the K3's NR performance will be realized. I'd like to
>> begin
>> by saying that Lyle and crew have a done a fantastic job to date with the
>> K3's NR. I've had the privilege of watching the K3's NR function improve
>> over time. The boys at Aptos should really be commended for listening to
>> their customers.
>>
>> With that said, the recent CQSS has made me realize that there is still
>> room
>> for improvement. During the SS, I used NR extensively in combination
>> with
>> RF gain and filter hi-cut/lo-cut/shift settings. NR when used in
>> combination with the aforementioned K3 adjustments can and does work
>> well.
>> The problem that I believe remains however is the algorithm used still
>> seems too broad in its rejection calculations; what I mean is that SSB
>> settings (i.e. F5-1 and higher) don't seem to be selective enough to
>> reduce
>> noise while allowing speech patterns to remain unaffected. In other
>> words,
>> the DSP sounds like its reducing everything within its passband. To my
>> ears, the NR doesn't seem to make speech "pop out" quite as effectively
>> has
>> other NR implementations. This can be seen by a not-so-subtle reduction
>> in
>> speech volume whenever the NR is turned on. The NR behavior is
>> consistent
>> regardless of AGC slope or threshold settings.
>>
>> Below are several links to audio recordings of a product I used to own.
>> It
>> is called the BHI ANEM (Mk. II). Sadly, I sold it after getting the K3.
>> I
>> should have hung on to it as it has become my benchmark for NR
>> performance.
>>
>> These are some sample recordings of the ANEM being turned on and off.
>> These
>> recordings are found on W4RT's website
>>
>> 20 m SSB <
http://www.w4rt.com/BHI/20Mband-ssb.wav>
>> 80 m SSB <
http://www.w4rt.com/BHI/80conv-ssb.wav>
>> 80 m SSB <
http://www.w4rt.com/BHI/80Mconv2-ssb.wav>
>>
>> I've also compared the K3's NR performance to that of the Icom 756 Pro 3
>> which has similar NR reduction properties - albeit not as effective - as
>> the
>> ANEM.
>>
>> Perhaps I am being subjective or overly critical, but one thing you can
>> easily notice with the ANEM recordings is that speech volume doesn't get
>> as
>> affected as the K3s. This is really surprising to me as the NR for the
>> ANEM
>> is AF rather than IF like what's used in our radios. This leads me to
>> believe that the ANEM's NR algorithms are more effective in reducing
>> background noise while leaving speech unaffected.
>>
>> What do you guys think?
>>
>> Sorry for the long email. Many thanks in advance for your
>> ideas/suggestions.
>> <
http://www.w4rt.com/BHI/20Mband-ssb.wav>
>> --
>> 73 de James K2QI
>> President UNARC/4U1UN
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