Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

Overall nor have I, it seems OK, but when I A/B it hear very little difference...   My noise is all low level of late, (on the order of S4 to S7), perhaps it takes a stronger source...  I do have a pop that sometimes goes off, I don't hear it with this method, however I do see it on the P3, so I

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

No luck with the NB, trying SSB with the FM-roofer. The NB already did a good job on the eletric fence 'ticks' using a normal filter. As for the other noise from the neighbourhood: I have not yet been able to produce a good result using this method. 73, Arie PA3A

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

Well actually I prefer copying CW with a certain amount of noise present. Pure tone, no noise CW, as from a practice oscillator or an S9++ signal quickly becomes boring and I loose concentration(or something). It's perhaps why I prefer to dig out weak signals (ESP) from the noise on the band.

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

j...@kk9a.com wrote > Even if this works for your noise, I wonder how well it will work using a > wide roofing filter in contest conditions. > > Perhaps for RX testing only you can select a different narrower TX filter? Definitely would not work in high activity contests, but fencer clicks would

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

-boun...@mailman.qth.net] On Behalf Of Dave Cole Sent: Saturday, February 06, 2016 9:47 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers Isn't that how the Transporter in Star Trek works? :) -- 73's, and thanks

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

Noise reduction is a difficult problem and hearing aid manufacturers have been trying to solve it for the last couple of decades. One important point to note is that noise reduction is normally aimed at reducing subjective noise and therefore reducing fatigue. Generally what you are doing is

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

David, My father made something like that many years ago. I'm thinking it is still here, one of the many things yet to be uncovered in his shack. Its in a blue plastic enclosure, I'll know it when I see it. He'd been a ham since 36 or 37 and he was an EE, worked for General Dynamics in

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

Even if this works for your noise, I wonder how well it will work using a wide roofing filter in contest conditions. Perhaps for RX testing only you can select a different narrower TX filter? John KK9A Bill W4ZV btippett at alum.mit.edu Sat Feb 6 05:34:34 EST 2016 I've been having a problem

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

Hi Bill. Does the same thing happen if you use the filters in the SubRX for the experiment? 73, Guy K2AV On Saturday, February 6, 2016, Bill W4ZV wrote: > wayne burdick wrote > > 2.8 kHz should give some improvement over a narrow filter on some types > of > > noise.

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

Isn't that how the Transporter in Star Trek works?  :) -- 73's, and thanks, Dave For software/hardware reviews see: http://www.nk7z.net For MixW support see: https://groups.yahoo.com/neo/groups/mixw/info For SSTV help see: http://groups.yahoo.com/neo/groups/MM-SSTV/info On Sun, 2016-02-07

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

I just discovered the same thing. I found the perfect noise to try it on on 15m, too. 73, Vic, 4X6GP/K2VCO Rehovot, Israel http://www.qsl.net/k2vco/ On 6 Feb 2016 12:34, Bill W4ZV wrote: wayne burdick wrote 2.8 kHz should give some improvement over a narrow filter on some types of noise.

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

wayne burdick wrote > 2.8 kHz should give some improvement over a narrow filter on some types of > noise. Worth a try. Just temporarily tell the firmware that it's a little > bit wider than your narrow filter, then use the WIDTH control to switch > between narrow and wide. Re-optimize the NB

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

My widest filter is 2.8MHz [the optional, 8-pole ssb filter]. Is the technique that Wayne is describing not applicable in my situation? ...robert On 02/04/2016 3:03 AM, Wayne Burdick wrote: Hi all, If you have... - really ugly noise sources that neither of the K3/K3S noise blankers

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

Hi Wayne, On list report as you asked for... Set up as described, only using a 13KHz filter in F1 position...   Using a florescent light, which makes a rather ugly wide band noise, only on 18 MHz., I performed a sort of blind test   After doing the full setup as you described on a very

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

2.8 kHz should give some improvement over a narrow filter on some types of noise. Worth a try. Just temporarily tell the firmware that it's a little bit wider than your narrow filter, then use the WIDTH control to switch between narrow and wide. Re-optimize the NB settings each time. Wayne

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

I'm glad that noise solutions are being investigated. I think advances in NR/NB would be of more importance to many hams than close-in dynamic range, however useful the improvement in those attention-getting figures are. On a day to day basis noise is the top culprit for many of us. 73, Drew

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

Wayne, Second report using Horticultural lights as noise source. Each evening 40 lights up with grow lights, and the results with them are much different than the previous results, the grow lights are cut back to the point I can hear additional stations, but only if I use headphones... Did the

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

I think the Collins NB was most effective on pulse type (ignition) noise encountered in mobile applications. http://collinsradio.org/archives/manuals/136B-2_5th-ed-11-66_.pdf - Roger W5RDW -- View this message in context:

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

The purpose of a Noise Blanker is to act only on repetitive pulse type noise. They do little to nothing for random type noise issues. 73 Bob, K4TAX On 2/4/2016 5:29 PM, W5RDW wrote: I think the Collins NB was most effective on pulse type (ignition) noise encountered in mobile applications.

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

In an earlier post it was asked: "> I would also like to see a technical description beyond the hand-waving in the manual of how noise blanking is performed. For example, I fail to see any dedicated delay in the signal path to create timing coincidence between the noise pulse and the

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

I owned a 75A-4 once, but I never thought to use it mobile:-) On 2/4/2016 4:29 PM, W5RDW wrote: I think the Collins NB was most effective on pulse type (ignition) noise encountered in mobile applications. http://collinsradio.org/archives/manuals/136B-2_5th-ed-11-66_.pdf

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

What, exactly, does the discussion of the Collins NB filter have to do with the experimental NB thing Wayne is working on? Can we stick to the topic at hand? On Thu, Feb 4, 2016 at 3:46 PM, Bob McGraw K4TAX wrote: > The purpose of a Noise Blanker is to act only on

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

Maybe this is an opportunity to rant about the K3/K3S noise blanker. Back on 12/8/15 K2AV wrote: "To those trying to get rid of a certain noise, remember that there are 21+21+(21x21) combinations of IF and DSP blanking. That's 483 combinations, not counting variations with preamp/normal/atten

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

Not to put too fine of a point on it but strictly speaking, that is incorrect. The characteristics of a pulse that can be blanked are: 1) its amplitude is sufficiently greater than the desired signal so it can be detected as undesired (noise) 2) its duration isn't so long that the "hole"

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

It's called topic drift. Without GPS stabilization it happens. On 2/4/2016 5:21 PM, Tim Tucker wrote: What, exactly, does the discussion of the Collins NB filter have to do with the experimental NB thing Wayne is working on? Can we stick to the topic at hand?

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

I've found quite a number of articles discussing noise blankers and the implementation of such. From my experience with radios on the desk, past and present, the hardware noise blanker works quite well. On the other hand, DSP/software noise blankers have always been found to be marginal.

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

Diddo for me WES Keith, KV5J -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-K3S-noise-blanker-performance-greatly-enhanced-at-my-QTH-need-testers-tp7613491p7613514.html Sent from the Elecraft mailing list archive at Nabble.com.

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

On Feb 3, 2016, at 11:29 PM, Vic Rosenthal wrote: > This is very interesting, because where I live there are sometimes strong > noise sources perhaps from OTH radar or other applications which take out big > chunks of a band. Hi Vic, Let me emphasize that this is an

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

Tim, Based on your positive results with SSB and the 15-kHz filter, I'm going to give it a try. Thanks, Wayne N6KR On Feb 3, 2016, at 10:56 PM, Tim Tucker wrote: > I did a quick 'n dirty cell phone video of the results of this on SSB. You > NEED to use headphones to

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

The Collins 136C-1 Noise Blanker seems interesting. 73, Dick - KA5KKT _ The Collins noise receiver operated around 40 Megacycles, as we said in those days. My late friend and "Elmer", Lee, W7UVR was one of the first kids on the block to have a 136C-1 blanker to use with his

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

The Collins noise receiver operated around 40 Megacycles, as we said in those days. My late friend and "Elmer", Lee, W7UVR was one of the first kids on the block to have a 136C-1 blanker to use with his 75A-4. Since he was quite well off financially I never understood why he lived in the

[Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

Hi all, If you have... - really ugly noise sources that neither of the K3/K3S noise blankers completely clean up, and - a 6-kHz crystal filter, and - a narrow crystal filter (200-1000 Hz) ...then you may want to try an experimental technique I've been using the past couple of days. In many

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

I did a quick 'n dirty cell phone video of the results of this on SSB. You NEED to use headphones to hear the difference because the cell recording has crappy audio. This test is done on 75 meters, dialed into a plasma TV generating noise. There is no intelligent signal present - just the noise

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

This is very interesting, because where I live there are sometimes strong noise sources perhaps from OTH radar or other applications which take out big chunks of a band. The technique described is suboptimal because you sacrifice the roofing filter function in order to narrow the blanker's

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

Wayne, What is the difference in configuration to trying this on SSB? Do we make the same settings change or change Filter 1 if we have the 13Khz filter? And how are AM and FM affected? I've got the type of noise you're referring to here from local plasma TV interference...I'd love to try this

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

If I understand it correctly, reason for the wide crystal filter is that a narrow filter stretches the noise pulses, making blanking ineffective. (The idea is to blank out the noise, without blanking out a lot of the signal.) The wide filter passes the narrow noise pulses to the DSP, which

Re: [Elecraft] K3/K3S noise blanker performance greatly enhanced (at my QTH) -- need testers

Hi Tim, The 15 kHz filter may work for this purpose in SSB mode. Haven't tried it yet, so it's even more experimental. Still, if you're game, just set the bandwidth of the FM filter (always FL1, if it's present), to a bandwidth just a little over the bandwidth of your normal SSB filter. For