Re: [Elecraft] Noise from KAT500?

There have been several tests in QST of switching power supplies in the past - including analysis of RF noise they create which was actually scary. Some are better than others, but all generate RF noise. I second the vote for non-switching (i.e. linear) supply from Astron (or equivalent) and

Re: [Elecraft] Noise from KAT500?

Send an email to: elecraft-unsubscr...@mailman.qth.net 73, Alan - G4GNX South Coast UK Elecraft K4D / KPA500 / KAT500 / IC-9700 > On 4 Dec 2023, at 23:03, Masadaman via Elecraft > wrote: > > How do I unsubscribe to this? > > Sent from Yahoo M

Re: [Elecraft] Noise from KAT500?

How do I unsubscribe to this? Sent from Yahoo Mail on Android On Sun, Dec 3, 2023 at 8:14 PM, Jim Brown wrote: On 12/3/2023 4:20 PM, David Woolley wrote: > small, ferrite toroid. Using a higher frequency allows a less bulky > transformer. Yes. 73, Jim K9YC __

Re: [Elecraft] Noise from KAT500?

Note Jim's words about a "good transmission line calculator" and take to heart Dan's ,AC6LA, words: "Think Twice Before Using a Web-Based Line Loss Calculator" See his site here: https://ac6la.com/swrloss.html Wes  N7WS On 12/4/2023 12:50 PM, Jim Brown wrote: Clarifying a typo, "antenna

Re: [Elecraft] Noise from KAT500?

Clarifying a typo, "antenna tuners" like the KAT500 are networks that transform the impedance presented by the transmission line to 50 ohms, allowing the output stage to provide power to the line. This has NO effect on loss in the line, which is determined solely by the match between the antenn

[Elecraft] Noise from KAT500?

 The KPA500 at the station only matches the transmitter to the transmission line and likewise for the receiver.   It does not change the match between the antenna and transmission line, thus the SWR and related loss from SWR remains. 73 Bob, K4TAX On 12/4/2023 8:07 AM, elecraft-requ...@mailm

Re: [Elecraft] Noise from KAT500?

On 12/3/2023 4:20 PM, David Woolley wrote: small, ferrite toroid. Using a higher frequency allows a less bulky transformer. Yes. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http:/

Re: [Elecraft] Noise from KAT500?

Most switch mode supplies have transformers. The weight differences reflects the difference between a large mass of laminated iron, and a, small, ferrite toroid. Using a higher frequency allows a less bulky transformer. -- David Woolley On 03/12/2023 04:54, David Gilbert wrote: The ones I m

Re: [Elecraft] Noise from KAT500?

I'd expect (in your case) a 60 or 120Hz based buzz to be part of that "noise".  But I don't hear that. 73. Dave G0WBX. On 03/12/2023 15:52, elecraft-requ...@mailman.qth.net wrote: Subject: [Elecraft] Noise from

Re: [Elecraft] Noise from KAT500?

vice I have in > the shack. > Thanks > Eugene W2HX > Sent from Nine<http://www.9folders.com/> > > > From: Bob McGraw > Sent: Sunday, December 3, 2023 12:11 PM > To: elecraft@mailman.qth.net > Subject: [Elecraft] Noise from KAT

Re: [Elecraft] Noise from KAT500?

PM > To: elecraft@mailman.qth.net <mailto:elecraft@mailman.qth.net> > Subject: [Elecraft] Noise from KAT500? > > Just power it from the transceiver power supply and all will be > resolved. There is no point in making life complex. > > 73 > > Bob, K4TAX > &g

Re: [Elecraft] Noise from KAT500?

? I don't have any 12v transceivers. This is the only 12 device I have in the shack. Thanks Eugene W2HX Sent from Nine<http://www.9folders.com/> From: Bob McGraw Sent: Sunday, December 3, 2023 12:11 PM To: elecraft@mailman.qth.net Subject: [Elecraft]

[Elecraft] Noise from KAT500?

Reflector Subject: Re: [Elecraft] Noise from KAT500? Message-ID: Content-Type: text/plain; charset="utf-8" Mike, K8CN wins the cigar! The issue is the power supply ? I took some spectrum analyzer plots to 7 MHz and you can see what I saw. The set up i

Re: [Elecraft] Noise from KAT500?

Oh purleeez, don’t start a political argument on an Amateur Radio forum, especially without changing the subject line. 73, Alan - G4GNX South Coast UK Elecraft K4D / KPA500 / KAT500 / IC-9700 > On 3 Dec 2023, at 15:28, Wes wrote: > > I know you are a fan of government running everything in

Re: [Elecraft] Noise from KAT500?

I know you are a fan of government running everything in our lives, but this "small" government is $33+ trillion in debt. On 12/2/2023 8:25 PM, Jim Brown wrote: 99.9% of stuff that plugs into the wall has a Switch-mode power supply, most of which are varying degrees of noisy. They were mandat

Re: [Elecraft] Noise from KAT500?

FWIW I had this issue with an IC7100/MFJ 1500W tuner. I was finding sprogs in the 40 metre band and they were changing frequency (moving round the band) when I changed the tuning frequency, which I put down to different relays being deployed, varying the load. I replaced the PSU and all returned

Re: [Elecraft] Noise from KAT500?

@mailman.qth.net Subject: Re: [Elecraft] Noise from KAT500? On 12/2/2023 5:48 PM, W2HX wrote: I then replaced the wall-wart power supply with a 12V battery. And this is what I saw for BOTH bypass and inline. Clearly the problem. https://w2hx.com/x/Elecraft/KAT500/Noise-Issue/KAT500-battery.png using a

Re: [Elecraft] Noise from KAT500?

On 12/2/2023 7:33 PM, David Gilbert wrote: Most of them have almost no reliable voltage regulation either. They are typically designed for a certain load, and if they don't see that load the voltage is much higher than rated.  I've tested dozens of these things (I tend not to throw anything awa

Re: [Elecraft] Noise from KAT500?

-Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of Jim Brown Sent: Saturday, December 2, 2023 8:25 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Noise from KAT500? On 12/2/2023 5:48 PM, W2HX wrote: > I then replaced the wall-wart power supply with a 12V batt

Re: [Elecraft] Noise from KAT500?

The ones I measured just a couple of months ago were way too small and light to have a transformer in them, and they were horrible.  In any case, I recommend that anyone using a wall wart for other than its intended equipment (or any standalone new one) be sure to check it for both noise and

Re: [Elecraft] Noise from KAT500?

This is usually true of the linear type of wall-wart, which is the quiet kind! They generally are composed of just a transformer, rectifier, and capacitor.They are almost extinct these days, but I look for discarded ones for use with equipment for which it is safe to use an unregulated power so

Re: [Elecraft] Noise from KAT500?

Most of them have almost no reliable voltage regulation either. They are typically designed for a certain load, and if they don't see that load the voltage is much higher than rated.  I've tested dozens of these things (I tend not to throw anything away) and it's fairly typical that a 12 volt

Re: [Elecraft] Noise from KAT500?

On 12/2/2023 5:48 PM, W2HX wrote: I then replaced the wall-wart power supply with a 12V battery. And this is what I saw for BOTH bypass and inline. Clearly the problem. https://w2hx.com/x/Elecraft/KAT500/Noise-Issue/KAT500-battery.png using a battery, the noise is about -80 dBm. Using the wall-

Re: [Elecraft] Noise from KAT500?

aft Reflector Reflector Subject: Re: [Elecraft] Noise from KAT500? Hi Eugene, Are you using a switch-mode power supply to feed the KAT500? If so, try a linear regulator supply or a battery instead. Is your KAT500 bonded to your other station equipment and AC ground with a short, wide c

Re: [Elecraft] Noise from KAT500?

One more thing to check, Eugene: Are the other two antenna ports on the KAT500 connected to anything? If so, disconnect those ports other than the one you used in your video demonstration. 73, Mike, __ Elecraft mailing list Home: http:/

Re: [Elecraft] Noise from KAT500?

Hi Eugene, Are you using a switch-mode power supply to feed the KAT500? If so, try a linear regulator supply or a battery instead. Is your KAT500 bonded to your other station equipment and AC ground with a short, wide conductor? (not just the coax shields) Since you're not the original construc

Re: [Elecraft] Noise from KAT500?

Eugene, This may or may not address your issue but the KAT500 user manual reports that a signal may be heard from an oscillator in the unit. The manual advises that this can be shut down when not in use by running the KAT500 Utility. Below is the reference to Idle Sleep in the manual. *Idle Sle

[Elecraft] Noise from KAT500?

Hello all, I have my new (to me) KAT500 up and running but I am noticing it is introducing quite a lot of noise when "inline" but the noise is gone in "bypass." Here is a video I made of the situation. The video shows the issue on 60m, but I will note, that I also checked the situation on 20m an

Re: [Elecraft] Noise problem with my K3 -- update

I want to thank those who made suggestions on how to find my problem. I spend a couple of hours relearning how to use my main backup rig (an Orion 2---it is not a useful backup if it takes that long---I guess I need to turn it on and make all of the necessary changes in switches and settings mor

Re: [Elecraft] Noise problem with my K3

__ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: ht

[Elecraft] Noise problem with my K3

For the first time in its 13-year life, I am experiencing a problem with my K3. I first noticed this last night while operating FT8 where the waterfall lit up in yellow. At first, I thought it was some kind of RFI, but it is pretty much the same on all bands and antennas (including my dummy load

[Elecraft] FS: Elecraft noise generator N-Gen

Tool for inserting white noise for receiver testing. Noise Generator, Wideband, 100 kHz - 500 MHz, 9V Battery or 12-15V DC Required (Not Incl.) $35 paypal only shipped conus. Also have Winford breakout boards. BRK9M $10 + shipping BRK15HDMF $15 + shipping TWO DB15 (not HD15) m

[Elecraft] Noise Blanker KNB1 FOR K1

I am looking for the Elecraft K1 Noise Blanker KNB1. Does anyone have this for sale? Ken N4SO Elecraft K1 number 260 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm P

Re: [Elecraft] Noise blanker and APF test recording

On 2/22/2021 1:14 PM, Wayne Burdick wrote: This recording hows how the new K4 noise blanker algorithm can reveal a signal buried under loud noise. Hi Wayne, Have your beta testers (or other users accumulated any experience blanking with any of K1JT's modes? I've got a couple of solar farms

Re: [Elecraft] Noise blanker and APF test recording

Thanks, Wayne. The effectiveness of the K4 NB will be a major factor for me. FWIW, I have found the K3 NB to be vital in my locality and have depended on it a lot (for hundreds of CW QSOs in the recent SKCC event), its major fault being key "clicks" from adjacent CW signals leaking through wh

[Elecraft] Noise blanker and APF test recording

A brief K4 audio sample can be downloaded using the link at the end of this email. This recording hows how the new K4 noise blanker algorithm can reveal a signal buried under loud noise. It also highlights the effectiveness of the audio-peaking filter (APF) when listening to a very weak CW si

[Elecraft] Noise with amp

I’m seeing the same thing with my KPA1500. All bonding is good. It appears on ten meters with about 10-dB and with about 15-dB on six meters. Sent from my iPhone __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/

Re: [Elecraft] Noise-cancelling Headphones Redux

Darn, I had to try... I have an AL-1306, nice Amp, but not I suspect as nice as a KPA-500, or 1500... 73s and thanks, Dave (NK7Z/NNR0DC) https://www.nk7z.net ARRL Technical Specialist ARRL Volunteer Examiner ARRL OOC for Oregon On 12/9/18 7:30 PM, eric norris wrote: Dear Dave: I asked my KPA

Re: [Elecraft] Noise-cancelling Headphones Redux

I don't care WHO ya are, that stuff's funny... ...LORD, I apologize, and be with the orphans down there in New Guinea, Amen. On Sun, Dec 9, 2018 at 10:33 PM eric norris via Elecraft < elecraft@mailman.qth.net> wrote: > Dear Dave: > I asked my KPA1500 if she wanted to be your KPA1500. > Ther

[Elecraft] Noise-cancelling Headphones Redux

Dear Dave: I asked my KPA1500 if she wanted to be your KPA1500.   There was a slight shudder from her front cloven hooves.  She went to FAN 5, wailing like a banshee, and all the LEDs flashed "NO NO NO" in Morse--at 15wpm so she was sure even I could copy. "It's OK, baby!," I screamed above her s

Re: [Elecraft] Noise-cancelling headphones mystery

I find my RS60 to be comfortable, but sometimes wish they had a cooling system. 73, Scott K9MA -- Scott Ellington. K9MA --- via iPhone > On Dec 9, 2018, at 12:34 PM, Grant Youngman wrote: > > I find the RS60 very comfortable for long periods. I know others who do, and > others t

Re: [Elecraft] Noise-cancelling headphones mystery

I find the RS60 very comfortable for long periods. I know others who do, and others that don’t. I have adjusted mine for ME. Which could lead someone else to find my specific headset uncomfortable (too tight, too loose) for THEM. You’re certainly right that the comfort of any headset is a ve

Re: [Elecraft] Noise-cancelling headphones mystery

On 12/9/2018 8:40 AM, CUTTER DAVID via Elecraft wrote: Noise cancelling that I've come across is limited to low/medium frequencies. Yes. Others have correctly identified the reason, but I'll go into a bit of detail for clarity. Noise cancellation works by amplifying a tiny mic on the outside

[Elecraft] Noise Cancelling head phones

*/NCT PA3500 looking for a new home .. I have an excellent NCT proACTIVE PA3500 Active Noise Reduction head phone each ear has large over the ear cover with Speaker and a Mic inside. The NCT Active noise canceling is powered by a 3.6 volt Nickel Cadmium battery. Two battery's with charger,

Re: [Elecraft] Noise-cancelling headphones mystery

See if you can borrow a hi quality aviation noise cancelling headset to try out. I have the now discontinued Sennheiser S1’s which work extremely well in many situations including with a single engine open cockpit aircraft, riding mowers, tractors, field day, etc. They have the added nicety of h

Re: [Elecraft] Noise-cancelling headphones mystery

I fully agree with your comment on the Radiosport. Great headphones, virtually noise free, and on a price par with the better noise cancelling Bose/etc. Of course, when I have mine on, my wife has to kick the chair or slap my head to get my attention. Which may not be all bad? :-) Grant NQ5

Re: [Elecraft] Noise-cancelling headphones mystery

Noise cancelling headphones rely on the distance between microphone and ear being a small fraction of the audio wavelength. At high frequencies, that will be impossible to achieve, and, even if you put in a compensating delay, the path to the ear is going to depend on the direction of the sou

Re: [Elecraft] Noise-cancelling headphones mystery

Noise cancelling that I've come across is limited to low/medium frequencies. If your hearing takes you higher, the noise-cancelling has finished by then. This is probably not the ability of the sensing mic but the circuitry and/or room acoustics, echo, etc. I'm a little out of date on the sub

Re: [Elecraft] Noise-cancelling headphones mystery

No noise canceling headphones will be effective against the high frequency noise of the KPA1500 fans. However, passive headphones can be very effective. The Radiosport makes the fans nearly inaudible. Not cheap, but neither is the KPA1500. 73, Scott K9MA -- Scott Ellington. K9MA

Re: [Elecraft] Noise-cancelling headphones mystery

As a guess, I would say the response of the mic used to derive the phase canceling audio does not adequately cover the audio noise spectrum of the 1500 puts out... Thus it can't phase cancel very well... That or your 1500 is filled with bad magic because it is supposed to be my KPA-1500 and i

[Elecraft] Noise-cancelling headphones mystery

I have owned a pair of Heil noise-cancelling headphones for many years.  They worked very well to reduce the noise of my old AL-1200 amplifier, and the 5 fans on my cantankerous man-killer Henry 2002A EME amplifier.  However, they are completely ineffective against the KPA1500.  I bought a pair

Re: [Elecraft] Noise Cancelling Microphones (was Re: Noise cancelling headphones)

Automatic noise cancelling microphone *systems* for consumer devices typically involve 3 carefully placed DMIC's (digital microphones) and a lot of DSP.73 de AI6KG On Sun, Aug 5, 2018 at 2:09 PM, Jim Brown wrote: > On 8/5/2018 10:48 AM, ANDY DURBIN wrote: > >> Many/most aviation headsets u

Re: [Elecraft] Noise cancelling headphones

Bose sells replacement earpads … not overly pricey. Grant NQ5T K3 #2091 KX3 #8342 > On Aug 10, 2018, at 1:35 PM, Douglas Hudson wrote: > > I have two pair Bose QC15 and one less costly headphones ($125), all of which > are about three years old. The black coating on every one of the ear piece

Re: [Elecraft] Noise cancelling headphones

New replacement pads on fleabay for $15. The old pads do not do well with sweat & body oils. 73, Gary KA1J > I have two pair Bose QC15 and one less costly headphones ($125), all > of which are about three years old. The black coating on every one of > the ear piece cushions has deteriorated a

Re: [Elecraft] Noise cancelling headphones

I have two pair Bose QC15 and one less costly headphones ($125), all of which are about three years old. The black coating on every one of the ear piece cushions has deteriorated and flacked off. The sets work properly and I like them but I could do without the black poof all over the place.

Re: [Elecraft] Noise cancelling headphones

I also used a QC15 and then moved to the QC25 and found that either is a very comfortable headset to wear for long periods of time. The little microphone that “dangles” in the cord actually works quite well with both the K3s and KX3 in most surroundings. All that it requires is a good TRRS jac

[Elecraft] Noise cancelling headphones

I've used the QC-15 and the are good. I had a headset buddy but the boom was "limp" it worked. I have a Uflymic for the QC15 if anyone has an interest. My choice now is the Bose QC25 and modmic by Antlion.  The QC25 has been replaced by the QC35 so you can get a "25" in an affordable range.

[Elecraft] Noise Cancelling Microphones (was Re: Noise cancelling headphones)

On 8/5/2018 10:48 AM, ANDY DURBIN wrote: Many/most aviation headsets use noise cancelling microphones but they are not active.  They simply sample most of the voice signal on the mouth side of the element and most of the noise on both sides of the element. Effective noise cancellation requires

[Elecraft] Noise cancelling headphones

Can anyone point me to a specification for any aviation headset that claims the microphone has active noise cancellation?   Can anyone point me to a specification for any non-aviation headset that claims the microphone has active noise cancellation? Many/most aviation headsets use noise cancelli

Re: [Elecraft] Noise cancelling headphones

Another of my 2 cents on this topic... While not for transmitting, there is a worthy consideration for wireless Rx headphones, the Gray Ghost headsets I use for metal detecting. There is a 1/4" plug which goes to the radio & is the transmitter. The headphones pick up this Tx and reproduce th

Re: [Elecraft] Noise cancelling headphones

I used to design aircraft audio systems for a living, but have been retired a year. The A20 is a nice headset and the audio quality from the mic and headphones is very good, over the wired connection, for safety services (communication with air traffic control). Listening to stereo entertainment v

Re: [Elecraft] Noise cancelling headphones

Thanks Mark, According to a tech at a one of the aviation stores, the latest versions of the A20 will allow using the headset/mike to access a paired device such as a smartphone, both to and from. Use it by muting the phone mike and talking/listening via the A20. Talking on a phone in a small pla

Re: [Elecraft] Noise cancelling headphones

man.qth.net] On Behalf Of Guy Olinger > K2AV Sent: Saturday, August 04, 2018 12:11 AM To: Chris Cc: Elecraft > Discussion List Subject: Re: [Elecraft] Noise cancelling headphones > > This thread seems to be read by some who are familiar with headsets, > but > I´m asking a slightly d

Re: [Elecraft] Noise cancelling headphones

er-the-ear headset. - pjd -Original Message- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Guy Olinger K2AV Sent: Saturday, August 04, 2018 12:11 AM To: Chris Cc: Elecraft Discussion List Subject: Re: [Elecraft] Noise cancelling headpho

Re: [Elecraft] Noise cancelling headphones

Amazon shows the HP8000 available from third party sellers at wildly varying prices. Sometimes they are bad or fake unfortunately. They claim new, but don't have enough info listed to tell if it meets your criteria. As far as I know, aviation headsets will not have wireless for the main headset or

Re: [Elecraft] Noise cancelling headphones

This thread seems to be read by some who are familiar with headsets, but I’m asking a slightly different question... A) I am looking for a headset/mike combination, with *all* the following. 1) over-the-ear dual headset 2) noise-cancelling headset 3) active noise-cancelling boom microphone 4) wi

Re: [Elecraft] Noise cancelling headphones

Is it Sony WH-1000XM2? I have one and love it. It is pricey but you get what you pay for. I tried both Bose and Sony, and chose Sony because it seems better with noise cancelling. When I fly alone for business, I use it with low volume music from my iphone, and I barely hear the engine noise.

Re: [Elecraft] Noise cancelling headphones

I use a set of Sennheiser noise canceling phones, mainly for ARES/RACES works when providing communication for parades. Combined with a noise canceling speaker/mic that has a jack for the phones they provide enough isolation from the marching bands to make communication possible. They are also

Re: [Elecraft] Noise cancelling headphones

Heck, I get latency between the moving mouths and the words they are saying on YouTube vids that I watch using Bluetooth headsets. For the rig work I'll put up with the privation of using wires. :) On Fri, Aug 3, 2018 at 08:52 Bob N3MNT wrote: > Be sure to check them on your rig before buying

Re: [Elecraft] Noise cancelling headphones

Those of us who wear hearing aids have an advantage. I just turn mine off when the plane is in the air. It works well for me, like 60dB reduction in my right ear, so I choose to sit on the right side of the aisle if I can. 73, Don W3FPR On 8/3/2018 7:54 AM, Barry wrote: I just got off 12 h

Re: [Elecraft] Noise cancelling headphones

Be sure to check them on your rig before buying them. in many cases Bluetooth introduces too much delay to use for CW work unless very slow speed. -- Sent from: http://elecraft.365791.n2.nabble.com/ __ Elecraft mailing list Home: http:

Re: [Elecraft] Noise cancelling headphones

I just got off 12 hours of airplanes yesterday and used these: https://www.amazon.com/Audio-Technica-ATH-ANC23-QuietPoint-Noise-Cancelling-Headphones/dp/B004K09H32/ref=sr_1_3?ie=UTF8&qid=1533297057&sr=8-3&keywords=ath+anc23 I've had them for a year or two and they work well on steady noise like ai

Re: [Elecraft] Noise cancelling headphones

Youngman > Sent: Thursday, August 02, 2018 5:03 PM To: k...@arrl.net Cc: Elecraft > Discussion List Subject: Re: [Elecraft] Noise cancelling headphones > > Bose is pretty well the leader in electronic noise cancellation. But > they are also expensive (even more than Sony). > > Worth

Re: [Elecraft] Noise cancelling headphones

I spent years, lots of effort, and lots of money trying to mitigate amplifier fan noise. Many kinds of noise cancelling headphones failed, including one aircraft type. I even tried putting an early NC headset inside of a pair of earmuff type ear protectors.  I built a cabinet to enclose the amp

Re: [Elecraft] Noise cancelling headphones

: Elecraft Discussion List Subject: Re: [Elecraft] Noise cancelling headphones Bose is pretty well the leader in electronic noise cancellation. But they are also expensive (even more than Sony). Worth their weight in GOLD on an airplane. (I still use my ancient original model 1.0 Bose when I

Re: [Elecraft] Noise cancelling headphones

Bose is pretty well the leader in electronic noise cancellation. But they are also expensive (even more than Sony). Worth their weight in GOLD on an airplane. (I still use my ancient original model 1.0 Bose when I fly — yes they’re clunky compared to the latest, and I had to replace the ear p

[Elecraft] Noise cancelling headphones

So here I am with three hours to wait until my plane boards. I tried a set of Bluetooth Sony noise cancelling headphones. Big mistake. They're great. $300.00 is too much for me. What other models are in use with Elecraft folks? Dave, K4TO

Re: [Elecraft] Noise Blankers

In addition to the hard limiter Elecraft provided threshold and slope controls in the AGC system. On 9/3/2017 4:04 PM, Ron D'Eau Claire wrote: The advantage of controlling the gain manually is not an "old wife's tale". Rather, it's clearly just a technique that is not for everyone. AGC will

Re: [Elecraft] Noise Blankers

From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wes Stewart > Sent: Sunday, September 3, 2017 3:00 PM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Noise Blankers > > Just a couple of points. > > In the K3(S) there

Re: [Elecraft] Noise Blankers

-boun...@mailman.qth.net] On Behalf Of Wes Stewart Sent: Sunday, September 3, 2017 3:00 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Noise Blankers Just a couple of points. In the K3(S) there is no "RF Gain" control unless by RF gain you mean "It's not the audio gai

Re: [Elecraft] Noise Blankers

On 03/09/17 20:38, Wes Stewart wrote: > The K3S blanker is slightly better than > useless. When I set it aggressive enough to be audibly useful, FT8 > decodes multiple signals at 120 Hz intervals, which upsets sequencing. That's an inevitable consequence of how a noise blanker works. It removes

Re: [Elecraft] Noise Blankers

Just a couple of points. In the K3(S) there is no "RF Gain" control unless by RF gain you mean "It's not the audio gain gain control." The "RF" gain control operates on the i-f amplifier, which is after the analog noise blanker. In this regard, it is little different from AGC, which operates

Re: [Elecraft] Noise Blankers

Depending the type of noise, for repetitive pulse type noise only,  the Noise Blanker does it job.  Now one must understand that all pulse noise is not alike.  Therefore, different values of NB, both with the  IF values and with DSP values, will require some adjustments.    If the noise is not

Re: [Elecraft] Noise Blankers

In my experience, NR is much better than NB against power line noise. However, NR does not work on DATA mode. I use BHI Compact In-line DSP Noise Eliminating Module, which is inserted between K3 line out and USB audio module. For effectively eliminating noise, tuning RF gain and AGC level in add

Re: [Elecraft] Noise Blankers

I agree. The adjustments are far too many and arcane.  I'm currently plagued with powerline noise that has yet to be fixed, although they are supposed to be working on it. The K3S blanker is slightly better than useless. When I set it aggressive enough to be audibly useful, FT8 decodes multiple

Re: [Elecraft] Noise Blankers

I find the K3 NB to be surprisingly effective.  I also find that adjustment is highly dependent on the characteristics of the signal and the noise, and the effects of changing those adjustments is subtle.  The effect of a blanker on ignition noise was really astounding ... "was," because igniti

Re: [Elecraft] Noise Blankers

On 9/3/2017 9:18 AM, K9MA wrote: I have never found the K3 noise blanker to be effective. BTW, the K3 noise blanker uses a filter with a bandwidth of about 100 kHz. The K3 NB is really TWO blankers, operating in two different IFs. Each can be tweaked for various kinds of noise from the me

[Elecraft] Noise Blankers

I have never found the K3 noise blanker to be effective. On the other hand, in side-by-side comparisons, the noise blanker in my old FT-1000D can be very effective on my ever present power line noise. However, like all noise blankers of that design, it only works if there are no strong signals

Re: [Elecraft] Noise Reduction

Impulse noise gets stretched out in time when passed through a narrow filter, so it must be removed ahead of the narrow filter. This is true whether in hardware or software. Since this is a very common type of man-made noise, effectively removing or reducing it would be very useful. I can't

Re: [Elecraft] Noise Reduction

Maybe the additional noise in the stages between where the filter would be in IF and where it is in AF? I know I'm thinking of multi-stage RF/IF/AF superhets and that might be what is tripping me up when it comes to a single conversion SDR capability. Maybe there is no difference? Or maybe componen

Re: [Elecraft] Noise Reduction

Doesn't appear to say very much.  Other than the BW difference [RF/IF BW might be more than ultimate AF BW], and provided that the demodulated audio is free of IMD and other obnoxious distortion, I don't see why NR at AF wouldn't be essentially the same as at IF.  Obvious differences in the mec

Re: [Elecraft] Noise Reduction

Discussion appears to be here. https://uk.groups.yahoo.com/neo/groups/SNR_group/info?v=1&t=directory&ch=web&pub=groups&sec=dir&slk=363 wunder K6WRU Walter Underwood CM87wj http://observer.w

Re: [Elecraft] Noise Reduction

Is there a website or software repository yet? Scott AD5HS On 8/23/2017 12:24 PM, P.J.Hicks wrote: I have been involved with a project developed by Peter Rhodes of the UK that started as a way to improve the NR in his Pick a Star trx. It appears that the project is nearing the limits of what

Re: [Elecraft] Noise Reduction

I'd love to hear some A/B audio samples of nitPic if they become available. It operates at AF? Operates well in congested bands? I've always been told that by the time the signal is demodulated to AF the damage is done. Why I believe this I have no clue. So when I hear something about noise reduct

[Elecraft] Noise Reduction

I have been involved with a project developed by Peter Rhodes of the UK that started as a way to improve the NR in his Pick a Star trx. It appears that the project is nearing the limits of what can be done and will hopefully go public soon. The project is called nitPic and operates on the audio

Re: [Elecraft] Noise when K-3 keyed

level issues I have found. 73, K9YEQ -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Ken Arck Sent: Sunday, September 18, 2016 9:13 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Noise when K-3 keyed I had the same problem - turned out

Re: [Elecraft] Noise when K-3 keyed

On Sun, 2016-09-18 at 22:19 -0400, Don Wilhelm wrote: > Louis, > > It goes away in TX TEST.  So I suspect it is an RF-in-the-shack > problem. > Try the K3 into a dummy load to verify that assumption. > > If it is OK on a dummy load, your best fix is in the antenna system -  > better baluns, check

Re: [Elecraft] Noise when K-3 keyed

I had the same problem - turned out to be noise from the computer (I was using the USB CODEC for audio in/out to the computer). Ken At 06:41 PM 9/18/2016, Fred Jensen wrote: OK, this reply is to the list, lots of very smart and experienced folks there. Let's see what others come up with give

Re: [Elecraft] Noise when K-3 keyed

Louis, It goes away in TX TEST. So I suspect it is an RF-in-the-shack problem. Try the K3 into a dummy load to verify that assumption. If it is OK on a dummy load, your best fix is in the antenna system - better baluns, check antenna connections and anything else that can cause common mode fe

Re: [Elecraft] Noise when K-3 keyed

OK, this reply is to the list, lots of very smart and experienced folks there. Let's see what others come up with given that additional info. It sounds to me like most if not all of the usual suspects are ruled out. 73, Fred K6DGW Sparks NV USA Washoe County DM09dn On 9/18/2016 6:27 PM, Lo

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