[Elecraft] K3 NB Info

[Lyn Norstad]

One simple rule ...

Never use any form of noise reduction on digital signals.

Period.

73
Lyn, W0LEN

-----Original Message-----
From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Dave
Sent: Wednesday, October 20, 2021 8:25 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 NB Info

Ed,

I have tried for a few years to come up with a good setting for the NB 
that does not degrade FT8 performance.  If you find one, please share 
it.  It seems that any combination of settings I use, reduces the FT8 
decode ability greatly for low level signals.  The net is a minus in 
decoding ability with the NB on.  I have a very loud set of 
horticultural lights in my area, about a block away, as the source.  My 
noise level has been reduced lately to only S6...

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 10/19/21 1:44 PM, Ed Cole wrote:
> I'm trying to use the DSP NB on local noise to improve my 6m reception 
> of very weak signals (i.e. eme signals).
> 
> There are three ranges of DSP NB T-1, T-2, and T-3 with level settings 
> of 1 to 7.  The levels are self explanatory, but have found no 
> description about the three ranges (application, function, etc)
> 
> I've inquired of fellow K3 owners that do eme and they say it improves 
> SNR with no deterioration of digital signals (specifically JT65 or Q65). 
>   FT8 is probably a good test and more widely used.
> 
> Opinions and recommendations.
> 
> My 6m local noise peaks to S7 in the NE and drops to S2 when antenna is 
> rotated to SE thru West.  Elevating 13-degrees also helps, dropping S7 
> to S4.
> 
> Tnx & 73, Ed - KL7UW
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