Only needs to done once per band unless the noise source really
changes. Of course the contest guys are changing bands every 3
milliseconds, so that might be a chore.
73
Bob, K4TAX
On 12/16/2021 4:19 PM, elecraft-requ...@mailman.qth.net wrote:
Message: 8
Date: Wed, 15 Dec 2021 11:52:54 -0700
From: David Gilbert<ab7e...@gmail.com>
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 Noise Reduction
Message-ID:<104029f2-7c47-ebca-3e8b-d3bf3015a...@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
I applaud the persistence it must have taken you to come up with that
procedure, but it's actually kind of amusing to think about repeatedly
doing all of that during a contest.
73,
Dave?? AB7E
On 12/15/2021 9:52 AM, Bob McGraw wrote:
The approach I use for the Noise Blanker is this.
I first activate the NB and then the Level.?? I start with the DSP OFF
and the IF OFF.? I then adjust the DSP value for optimum results
without it destroying the quality of the signal.? DO MAKE A NOTE OF
THIS VALUE.? Then set the DSP back to OFF.? Then move to the IF and
scroll through the settings in an effort to find optimum results.?
Once this is done, leave the IF value as determined and return to the
DSP and set it to the value previously determined.
This works for a given band and given type of noise.? Change bands or
noise and do it all again.? There is no ONE setting correct for every
condition. ? Right now my 6M noise buzz is S-7 with the NB off.? Then
turning it ON and adjusted as above the 6M noise is S-3.? That's 4 S
units or 24 dB improvement.? I doubt you will get much better than this.
As to Noise Reduction, I find it best performs for CW mode. Again it
takes careful adjustment to obtain optimum results.?? I don't use NR
for SSB signals. I prefer to adjust the Attenuation value and the RF
Gain to produce optimum results when operating SSB.?? I find optimum
results occur when the no signal band noise is about 10 dB above the
receiver noise floor.?? In order to accomplish this operating point,
one will need to use ATTENUATION and RF Gain reduction.?? More gain
won't aid in receiving weak signals, but just the opposite, as the
signal will pop out of the noise.
I generally find using either NB or NR, but not both, is the better
way to operate.? I doubt there is anything wrong with your radio.?
Most likely the result is more related to receiver setting parameters.
73
Bob, K4TAX
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