[Elecraft] RFI issues with Keurig Dual Pro 5200
Hello all: I am wondering if this new model for Keurig has an SCR chopper to regulate temp in the heater coils? Something changed...if I had one, I would take it into the lab to figure outn what went wrong. Have full FCC EMI test capability--could find out if they are failing in a snap! But, don't have one...sigh John -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of elecraft-requ...@mailman.qth.net Sent: Saturday, February 22, 2020 6:36 PM To: elecraft@mailman.qth.net Subject: Elecraft Digest, Vol 190, Issue 18 Send Elecraft mailing list submissions to elecraft@mailman.qth.net To subscribe or unsubscribe via the World Wide Web, visit http://mailman.qth.net/mailman/listinfo/elecraft or, via email, send a message with subject or body 'help' to elecraft-requ...@mailman.qth.net You can reach the person managing the list at elecraft-ow...@mailman.qth.net When replying, please edit your Subject line so it is more specific than "Re: Contents of Elecraft digest..." Today's Topics: 1. Re: RFI issues (hawley, charles j jr) 2. Audio controller/limiter (Mark Simms) 3. Re: Audio controller/limiter (Robert Cunnings) 4. Re: Audio controller/limiter (Mark Simms) 5. Re: K3 always 100 W (Pedro, EA4KD) 6. Re: February 16, 2020 SSB net (K8TE) 7. Re: P3 Goodness and questions (David Box) 8. Re: RFI issues (Jim Brown) 9. Re: RFI issues (Lyn Norstad) 10. Sub Receiver for K3S (W4IEN) 11. Re: RFI issues (Jim Brown) 12. Ivory Coast DXpedition (Lyn Norstad) 13. Re: Ivory Coast DXpedition (Rick Bates, NK7I) 14. Re: Ivory Coast DXpedition (rocke...@gmail.com) 15. Changed Listing Kx-2 For Sale or Trade $1100 (George P Linehan III) 16. Re: KX-2 For Sale $1200 AS NEW CANCEL LISTING NEW ONE POSTED (George P Linehan III) 17. Re: Elecraft Digest, Vol 190, Issue 17 (Norman) -- Message: 1 Date: Sat, 22 Feb 2020 03:14:56 + From: "hawley, charles j jr" To: Bob McGraw K4TAX Cc: "elecraft@mailman.qth.net" Subject: Re: [Elecraft] RFI issues Message-ID: Content-Type: text/plain; charset="utf-8" There's a paragraph of slightly raised writing on the bottom...really hard to read, but if I get a chance to turn it over again, I'll check. It's set up for morning right now. Jack BMW Motorcycles Chuck KE9UW c-haw...@illinois.edu Sent from my iPad > On Feb 21, 2020, at 8:06 PM, Bob McGraw K4TAX wrote: > > ?Seems like a good reason not to buy one. Which reminds me, do they have a > Part 15 label attached? Not that they actually meet Part 15 requirements. > > 73 > Bob, K4TAX > > > Sent from my iPhone > >> On Feb 21, 2020, at 8:02 PM, hawley, charles j jr >> wrote: >> >> ?Keurig Pro Duo 5200 (they leak stuff out when you turn them upside down...) >> >> Jack BMW Motorcycles >> Chuck KE9UW >> c-haw...@illinois.edu >> >> Sent from my iPad >> On Feb 21, 2020, at 7:20 PM, Gary K9GS wrote: >>> >>> ?What's the MODEL number??73,Gary K9GS >>> Original message From: "hawley, charles j jr" >>> Date: 2/21/20 5:08 PM (GMT-06:00) To: >>> l...@lnainc.com Cc: elecraft@mailman.qth.net, W8JH >>> Subject: Re: [Elecraft] RFI issues This is the newest one that brews a >>> carafe of 10 cups or does a pod into your mug. I too have had others >>> without any noise, but this new one puts a huge sine wave of noise on the >>> panadapter. I have put ferrite on the line cord which don't affect it. I >>> just turn the thing off after brewing...or wait about 5 minutes and the >>> noise goes away. Jack BMW MotorcyclesChuck KE9UWc-hawley@illinois.eduSent >>> from my iPad> On Feb 21, 2020, at 11:42 AM, Lyn Norstad >>> wrote:> > ?I've had several of the inexpensive Keurig Pod type, and have >>> never had an issue on any band.> > Kitchen is right next door to the shack, >>> and the pot is on all day.> > Lyn> W0LEN> > > -Original Message-> >>> From: elecraft-boun...@mailman.qth.net [mailto:elecraft-bou n...@mailman.qth.net] On Behalf Of hawley, charles j jr> Sent: Thursday, February 20, 2020 2:04 PM> To: W8JH> Cc: elecraft@mailman.qth.net> Subject: Re: [Elecraft] RFI issues> > I still love the coffee maker and would buy it again. I just turn it off after the pot or pod is brewed.> > Chuck Jack Hawley > KE9UW> > Sent from my iPhone, cjack > >> On Feb 20, 2020, at 12:12 PM, W8JH wrote:>> >> ?ke9uw wrote>>> We bought a new Keurig coffee maker which does a pot or also the pods. It>>> puts a huge noise out to the ham frequencies. Have to turn it off to get>>> on 80M>> >> That is a serious conflict!>> >> 80m morning greyline without caffeine, people cannot live this way!!>> >> >> >> >> ->> 73,>> >> Joe, W8JH>> >> K3s, KPA 500, KAT 500 and KX3 happy user.>> -->> Sent from: http://elecraft.365791.n2.nabble.com/>> __>> Elecraft mailing
[Elecraft] Remote with Satellite
Has anyone tried remote operation with a satellite internet connection? I’m wondering if the latency is excessive. I am looking into a remote Elecraft Station. Thanks in advance. John K0UM __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Elecraft Digest, Vol 170, Issue 7
K3 vs S-Line This is an interesting topic. Sherwood has made distortion measurements on many many receivers. As you see on his website, the K3 is far far better than the S-Line. The key measurements are dynamic range measurements—particularly with nearby signals. The radio is limited at the low end by its noise floor (and because HF is so noisy you really done need super low noise floor). But at the high end, the receiver is limited by distortion and blocking. The K3 and, interestingly the KX3, are near the top of the list. Far better than the old Collins rigs. I think what happens is we remember back in the 1960s when there were far fewer hams and that old 75A4 really sounded great! I fully agree—these radios did sound great! But today there are twice as many hams crammed into the same bands and is can be really tough for receivers to discriminate without distorting. If you want to see what I mean, try using your 75S3C during a busy contest then switch to a K3. As far as birdies, most radios have birdies. Modern radios are so sensitive and selective that they can pick up the digital modem two houses away on 6” of wire. We live in a digital world and there are noise sources everywhere! Even in the K3. I had birdies in my Icom 781, my WJ 8711’s and my K3. They were/are all below the atmospheric noise level. Never a problem! My PL noise was far worse. Good topic, Bill! John Perlick Aria Corporation www.ariacorp.com > On Jun 3, 2018, at 1:17 PM, "elecraft-requ...@mailman.qth.net" > wrote: > > rom: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Bill > Sent: 3. juni 2018 15:17 > To: elecraft@mailman.qth.net > Subject: [Elecraft] Compare: K3 to Collins S-line receiver > > Discounting the digital capabilities such as memories, DSP, etc. and > only considering actual signal reception: I have had S-lines in the past > (dark dim past), so certainly am familier with them. However, as a point > of curiosity, how does the S-line compare to the K3 (only interested in > SSB). Basically, I am interested in how a top of the line analog > receiver does compares to a K3(S)? The question comes from a QSO > regarding the microprocessor noise of modern rigs covering and/or > distorting received signals. Offline response might be good for this, as > I am sure not many would be interested in the subject. > > Thanks, Bill W2BLC K-Line > > __ __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KPA1500 Fan Noise
Every amplifier has some level of fan noise. My new KPA1500 is seriously quieter than my former Expert 2KFA. My Henry 2K Ultra fans were so loud that I couldn't keep it in the radio room. Luckily I had the remote version. My Harris RF-3230 (all solid state) had 8 six-inch muffin fans! It sounded like a DC-9 warming up for a takeoff. I was two rooms away from the shack and I could still hear those fans! I run my KPA1500 at 1500 Watts SSB/CW and I have never heard the fans go past setting #2. If you want to run 1500 Watts of RTTY or AM, then expect the fans to be running hard to keep the amp cool. If you want a quieter shack, put the amp in another room. __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] KPA-1500 Fan Noise
Bill Schmidt is right--you have to get rid of a bunch of heat--no matter what device you are using to amplify (tubes, transistors, or magic). The amplifying device must dissipate considerable heat because we are running Class AB and because of all electronic devices are naturally lossy. Remember that this heat is generated not only in the RF transistors, but also in the power supplies, bias circuits, lights, etc. There are lots of heat sources in every amplifier. I can honestly say that my KPA1500 is considerably quieter than the Expert 2KFA that I just sold and I would have to say it is quieter than my old Alpha 87A. I do operate it at full 1.5 KW output but I suspect my duty cycle on CW has not caused it to so how that the fans max out. Same for the 2KFA, but even at low speeds, it was far noisier. And, the 2KFA has REALLY loud T/R relays! __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KPA1500 LCD Color
I love the backlight color on my K3/K3S and KX3. I also love my new KPA1500. But, why oh why did you change to a blue backlight on the KPA1500? Dang, I love that amber color--reminds me of that faded amber color of those old radios, like my RME-45 that I had before my Novice days. Let me know if you do change to Amber! __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KX3 in International carry-on luggage?
I have traveled to Europe/Caribbean a few times with my KX3. I just packed it in my (carry-on) suitcase or in my backpack and never had a problem. I didn't pack it with batteries, because I could always just plug in a universal adapter. You might choose not to bring batteries if you can get a good AC power adapter--just bring the appropriate plug adapters. Also, I learned the hard way, the antenna is more important than the radio! I used an end-fedz which worked great only after I strung it out away from the hotel building--all the steel in the building just ruined the signal. Get it high and as far away from other structures as possible. Let the internal antenna tuner do it's magic. I had a blast--and worked friends in the USA with the KX3. Good luck and have fun! __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KPA1500 arriving, 2KFA for sale
My KPA1500 is on its way, so my 2K-FA is for sale. Less than 6 months old, only a few hours, 100% like new condition. Save taxes, can deliver to Dayton. $6195. John K0UM 847-207-2960 __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] Antenna Analyzer
I have the SARK and have used it around the world. It works great, is accurate, tiny, self contained and easy to use. Only downside is price but mine has easily paid for itself (by reducing the number of times I had to climb my tower!). John Perlick Aria Corporation www.ariacorp.com > On Dec 1, 2017, at 11:37 AM, "elecraft-requ...@mailman.qth.net" > wrote: > > Send Elecraft mailing list submissions to >elecraft@mailman.qth.net > > To subscribe or unsubscribe via the World Wide Web, visit >http://mailman.qth.net/mailman/listinfo/elecraft > or, via email, send a message with subject or body 'help' to >elecraft-requ...@mailman.qth.net > > You can reach the person managing the list at >elecraft-ow...@mailman.qth.net > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Elecraft digest..." > > > Today's Topics: > > 1. Antenna Analyzer (John Harper) > 2. Re: Antenna Analyzer (Dave Cole (NK7Z)) > 3. FR - KX2 max output now 12 watts (experimental) (John Oppenheimer) > 4. Re: Antenna Analyzer (John Oppenheimer) > 5. Re: Antenna Analyzer (Michael Walker) > 6. Re: Antenna Analyzer (Jim Sheldon) > 7. Re: Antenna Analyzer (Bob N3MNT) > 8. Eleraft list (Paul (Tex) Herson) > 9. For sale (Sid Leben) > 10. Re: Antenna Analyzer (Dave Cole (NK7Z)) > 11. Re: Antenna Analyzer (Mike Cox) > 12. Re: Antenna Analyzer (FA-VA4) (Peter Eijlander (PA0PJE)) > 13. Re: Antenna Analyzers (Mike Lichtman) > 14. OT - Want to buy SideKar (Paul (Tex) Herson) > 15. Antenna Analyzer (Dick Dickinson) > 16. Re: Eleraft list (Charlie T) > 17. Happiness is a new Elecraft Purchase (Mark Tosiello) > 18. Re: Antenna Analyzer (Igor Sokolov) > 19. Re: K3 PRE function question (Edward R Cole) > 20. Re: K3 PRE function question (GRANT YOUNGMAN) > 21. Re: Antenna Analyzer (FA-VA4) (Ignacy) > 22. Re: Antenna Analyzer (FA-VA4) (Mark Goldberg) > 23. Re: Antenna Analyzer (Doug Person) > 24. Re: Antenna Analyzer (George Thornton) > 25. K1 price? (Ken Alexander) > 26. Re: Antenna Analyzer (Ronnie Hull) > 27. Re: Antenna Analyzer (Michael Walker) > > > -- > > Message: 1 > Date: Fri, 1 Dec 2017 06:57:08 -0600 > From: John Harper > To: Elecraft list > Subject: [Elecraft] Antenna Analyzer > Message-ID: > > Content-Type: text/plain; charset="UTF-8" > > I highly recommend this one - cost effective, easy to build and compares > favorable to more expensive models: > https://ae5x.blogspot.com/2017/10/new-antenna-analyzer.html > > More here: > https://ae5x.blogspot.com/2017/11/a-brief-comparison-of-two-antenna.html > > > 73, > John AE5X > > > -- > > Message: 2 > Date: Fri, 1 Dec 2017 04:58:22 -0800 > From: "Dave Cole (NK7Z)" > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] Antenna Analyzer > Message-ID: <26b46a20-5b9c-3f46-10c1-1085b6bb3...@nk7z.net> > Content-Type: text/plain; charset=utf-8; format=flowed > > The AA series from Rigexpert is also very lightweight... > > 73s and thanks, > Dave > NK7Z > http://www.nk7z.net > >> On 12/01/2017 04:53 AM, John Stengrevics wrote: >> The RigExpert line is small. >> >> 73, >> >> John >> WA1EAZ >> >>> On Dec 1, 2017, at 7:49 AM, wrote: >>> >>> just a quick question for the collective group here. I have built up my >>> KX-2 travel kit. The first week of november I took it with me to a cabin I >>> leased outside of Gatlinburg, TN for some portable operating when I wasn?t >>> up in the mountains hiking. I took m y Super Antenna MP-1 plus the parts to >>> throw up a full wave loop for 40M. I did throw the loop up, and it out >>> performed the MP-1 by kudo?s. But it struck me that it might be nice to >>> add a small antenna analyzer to my kit. >>> I don?t need a big full size MFJ, which I do have. But something small. >>> Any experience here y?all? >>> >>> thanks in advance for your answers >>> >>> Ronnie W5SUM >>> __ >>> 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: http://www.qsl.net/donate.html >>> Message delivered to jstengrev...@c
[Elecraft] KPA500, KAT500 for sale
Price reduced to $2000 for super clean KPA500+KAT500, with interconnecting cable. Contact me for pics. John K0UM jperl...@ariacorp.com __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] For Sale KPA500 + KAT500
For sale, KPA500 + KAT500 both in mint condition. Full 500W+ output. 160-6M. Includes one interconnecting cable. Both in 100% operational condition. $2250 for both, plus shipping. It's like buying the amp and getting the tuner for free! John, K0UM, 847-207-2960, jperl...@ariacorp.com __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KPA1500 amplifier with built-in ATU, separate power supply
You have to remember that the built in tuner matches the amp to the transmission line. It does nothing to improve the SWR at the antenna or to protect your coax. Well, it might incrementally improve the loss in the coax because the reflected wave from a high SWR antenna would not be the-reflected at the amp. It would be fully absorbed into the amp which is well matched. The really good thing that the internal tuner does is make life easier for the amp. You will get more power out because the protection circuits don't have to protect the amp. I'd be far more protective of my amp than my coax! John Perlick Aria Corporation www.ariacorp.com > On Apr 21, 2017, at 2:29 PM, "elecraft-requ...@mailman.qth.net" > wrote: > > KPA1500 >amplifier with built-in ATU, separate power supply __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] Amplifier Thoughts
Someone here mentioned the amp would dissipate little with 90% efficiency for amp and power supply. That is, of course, a dream even for high efficiency switch-mode amps. There are several unique characteristics with SS amps. They are truly different that that trusty and rugged old dual 3-500 Amp. First, the power supply. You can use a linear power supply, big transformer etc. You can even regulate it if you like. Most good transistors run in 50 VDC. But this approach gets you back to that 75 pound transformer. Switch mode power supplies at 50v 60-80 A are easily possible with today's technology. But it also means that you will need PFC if you don't want to pop your breaker every time you tune up. Efficiencies in the area of 85-90% are common for PFC + SMPS. You can do better at higher cost. The amp itself is likely to achieve 55-60% efficiency depending on where you set the bias for AB2 operation and your actual operating conditions. Note that this number varies with several factors including temperature. Then there is SWR. Remember that Drake L4B amp has a tunable matching network at the output that acts like an RF matching transformer to match the tube output impedance (K-ohms) to whatever antenna impedance you have. It can tolerate a wide range of impedance --maybe 2:1 or even 3:1. This means that the 1500 W of RF power is efficiently sent down the coax--mismatch is handled. In the case of a solid state amp, the output is matched to 50 Ohms or so. Period. So any mismatch means that RF is reflected back into the ampwhere it is converted into heat. Depending on your SWR, that could be substantial! So let's say 3:1. Then 25% of the power is reflected. Note: at 10:1 you reflect 67% of the power so that means 500 W reaches your antenna and 1000W is dissipated in the Drain-Source junctions of your expensive RF transistors! So let's look at it this way. You put out 1500 W Amp efficiency is 60% = 1000w dissipated Power supply = 87% = 374 W dissipated Reflected at 3:1. 375 W Total 1749 watts Go turn on that 1500 W space heater to see what this feels like! The design is almost more of a thermodynamic challenge than an RF challenge!!! John Perlick Aria Corporation www.ariacorp.com > On Mar 30, 2017, at 11:26 AM, "elecraft-requ...@mailman.qth.net" > wrote: > > Send Elecraft mailing list submissions to >elecraft@mailman.qth.net > > To subscribe or unsubscribe via the World Wide Web, visit >http://mailman.qth.net/mailman/listinfo/elecraft > or, via email, send a message with subject or body 'help' to >elecraft-requ...@mailman.qth.net > > You can reach the person managing the list at >elecraft-ow...@mailman.qth.net > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Elecraft digest..." > > > Today's Topics: > > 1. Re: K3/K3s; Digital modes, specifically DV (Matt Zilmer) > 2. K3S and Winlink (Tom S Bingham) > 3. Re: K3S and Winlink (Barry) > 4. Re: Amplifier thoughts (John Marvin) > 5. Re: K3/K3s; Digital modes, specifically DV (Richard Fjeld) > 6. Re: Amplifier thoughts (Chris Tate - N6WM) > 7. Amplifier thoughts (j...@kk9a.com) > 8. Re: Amplifier thoughts (David Bunte) > 9. Re: KX3 - AFSK RTTY (Fred Moore) > 10. Re: Amplifier thoughts (Phil Hystad) > 11. K3- padded carrying case (r...@aol.com) > 12. Re: K3- padded carrying case (Ian Kahn) > 13. Re: Amplifier thoughts (Doug Smith) > 14. Re: Amplifier thoughts (Arie Kleingeld PA3A) > 15. OT: W0PW is SK (Ken G Kopp) > 16. Re: Amplifier thoughts (John Meade W2XS) > 17. Re: Amplifier thoughts (Ron D'Eau Claire) > 18. K3- padded carrying case (j...@kk9a.com) > 19. Re: Amplifier thoughts (Jim Brown) > 20. Re: K3- padded carrying case (Mark E. Musick) > 21. Re: Amplifier thoughts (Ron D'Eau Claire) > 22. Re: Amplifier thoughts (Oliver Dr?se) > 23. Re: Amplifier thoughts (Rick WA6NHC) > 24. Re: Amplifier thoughts (Ron Wilcox) > 25. Re: K3- padded carrying case (Bill Frantz) > 26. K3/100 + P3 **Update** (Phil Hystad) > 27. K2 bad encoder? (Dave Redfearn) > > > -- > > Message: 1 > Date: Tue, 28 Mar 2017 18:00:41 -0700 > From: Matt Zilmer > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] K3/K3s; Digital modes, specifically DV > Message-ID: <80ed21e8-d07b-dfed-7e09-22c2840c9...@roadrunner.com> > Content-Type: text/plain; charset=utf-8; format=flowed > > I loaded FreeDV today, on an Ubuntu i5-64bit laptop. It works quite > well. I heard no calls on 14.236 MHZ, but the receive function is > working. I'm having the usual fun setting up PTT, but it will come > along
Re: [Elecraft] Elecraft Digest, Vol 155, Issue 50
Re: Higher Power Amps Personally I want an amp that will load at 1500 Watts. Like my Alpha 87A or before it my All would state RF-3230--both had loads of design margin at 1500 W output. That give me comfort that the amp going to last a very long time. K0UM John Perlick > On Mar 30, 2017, at 6:38 PM, "elecraft-requ...@mailman.qth.net" > wrote: > > Send Elecraft mailing list submissions to >elecraft@mailman.qth.net > > To subscribe or unsubscribe via the World Wide Web, visit >http://mailman.qth.net/mailman/listinfo/elecraft > or, via email, send a message with subject or body 'help' to >elecraft-requ...@mailman.qth.net > > You can reach the person managing the list at >elecraft-ow...@mailman.qth.net > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Elecraft digest..." > > > Today's Topics: > > 1. Re: USB to Serial adapter for KIO2 (Harry Yingst) > 2. OT; New technology/Graphene (Richard Fjeld) > 3. Re: K3/100 + P3 **Update** (Phil Hystad) > 4. KX line future accesories (David Satterwhite) > 5. Re: Amp Thoughts: 1000 watts or 1500 watts? (Ken K6MR) > 6. Re: FCC R&O approves 630m ham band (Rick WA6NHC) > 7. Re: USB to Serial adapter for KIO2 (Harry Yingst) > 8. Re: Future KX3/KX2 accessories? (Gerard Elijzen) > 9. Re: Amp Thoughts: 1000 watts or 1500 watts? (Ken K6MR) > 10. Re: Amp Thoughts: 1000 watts or 1500 watts? (Ron D'Eau Claire) > 11. FCC R&O approves 630m ham band (Emory Schley) > 12. Re: Future KX3/KX2 accessories? (Bill Frantz) > 13. Re: Future KX3/KX2 accessories? (Bill Frantz) > 14. KX2 Weighted Knob (Doug Millar) > 15. Re: Amp Thoughts: 1000 watts or 1500 watts? (Charlie T, K3ICH) > 16. Re: KX2 Weighted Knob (Chris Tate - N6WM) > 17. Re: FCC R&O approves 630m ham band (Edward R Cole) > 18. Re: Mounting a KX3+PX3 ? (David Anderson) > 19. Re: KX2 Weighted Knob (Harry Yingst) > 20. Re: Elecraft] USB to Serial adapter for KIO2 (Jim Allen) > 21. Re: Elecraft Digest, Vol 155, Issue 49 (Patrick Lynch) > > > -- > > Message: 1 > Date: Thu, 30 Mar 2017 21:20:06 + (UTC) > From: Harry Yingst > To: "donw...@embarqmail.com" , Elecraft Email >List > Subject: Re: [Elecraft] USB to Serial adapter for KIO2 > Message-ID: <1917436095.710358.1490908806...@mail.yahoo.com> > Content-Type: text/plain; charset=UTF-8 > > > For my use it fits my needs better as?I do not plan to use Elecrafts > Transverters nor their 100 watt amp remotely. > So it becomes a simpler solution. > > > > From: Don Wilhelm > To: Harry Yingst ; Elecraft Email List > > Sent: Thursday, March 30, 2017 4:30 PM > Subject: Re: [Elecraft] USB to Serial adapter for KIO2 > > Harry, > > OK in broad concept - EXCEPT, things get bogged down in the details: > You will have some problems to solve if using that device. > > First of all, the K2 MCU RX and TX signals need to be TTL (0 to 5V) > instead of RS-232 and the polarity must be inverted - so you will need > some more logic circuits to make it work. > > 2nd, the KIO2 provides internal K2 signals needed for Elecraft > accessories like the KAT100, KRC2, XVseries Transverters.? If you ever > want to add any of those accessories, you will be back "where you started". > > 3rd, if you ever add the KPA100, you will have to give up all your work. > Although that device will mount on the KPA100 board, the levels and > polarity are not right AND it contains ALL the RS-232 signal lines, not > just TXD and RXD and Signal Ground.? You would have to make extensive > modifications to the KPA100 board to make it work - and you still do not > have the internal K2 signal lines to support the external Elecraft > accessory boxes. > > Simple "solutions" are often complex.? It is easier to use an external > USB to serial adapter IMHO. > > 73, > Don W3FPR > >> On 3/30/2017 3:43 PM, Harry Yingst wrote: >> >> Instead of a KIO2 I am installing a DB9-USB-D5-F >> >> USB straight to the K2 >> >> >> >> >> > > > > > > -- > > Message: 2 > Date: Thu, 30 Mar 2017 21:22:46 + > From: Richard Fjeld > To: Elecraft Reflector > Subject: [Elecraft] OT; New technology/Graphene > Message-ID: > > > > Content-Type: text/plain; charset="utf-8" > > (If this has been mentioned before, I apologize.) > > In looking for information on new ba
Re: [Elecraft] [P3] Ability to copy very weak signals
There are several factors that make this technique insufficient to "measure" your ears. The K3 splits the incoming signal path and sends part of the signal to the P3 and part to the K3 receive circuitry. The split occurs just after the first mixer so the P3 is sampling a wideband signal (+/- 200 KHz) centered at the 9 MHz IF. The K3 passes the same signal through the narrowband IF filters, amplifies the signals and down-converts to 15 KHz, amplifies again, and then uses a TI DSP for filtering, Noise Reduction and detection. The P3 is an SDR directly operating on the wideband 9 MHz IF input signal. It immediately converts the signal using a different A/D converter, a digital down converter and digital filters, and a Microchip DSP. These two signal paths are dramatically different! They each have their own imperfections including noise, several kinds of distortion, and differences in digital processing algorithms. Just because you can see a signal on the P3, it doesn't mean you can hear it through the K3. And the reverse is also be true--just because you hear it on the K3, it doesn't mean that you can see it on the P3. There are just too many variables. The P3 does indeed have an extremely narrow bandwidth--only one pixel wide or roughly SPAN/450. But, this is after a signal is processed with amplifiers, an A/D converter, a digital mixer and decimation filters, and then converted to a spectrum display with an FFT (with some NR). All of these processes, whether analog or digital, slightly degrade the S/N ratio of the signal. The K3 uses a very modern approach to maximize dynamic range in the signal path. While it is low noise, it is also highly immune to distortion. The K3 has a wide variety of selectable signal processing techniques that are not in the P3, including two Noise Reduction systems, Noise Blanking, AFX, EQ, Notch, and both narrowband analog and digital filtering. You can set up the K3 signal path to operate in many different ways--and these various set-ups will affect noise floor and dynamic range. There is no guarantee that these two paths maintain the same noise floor and the same distortion characteristics. Sorry, but you can't use your P3's display to measure your ears. But, that doesn't mean that some excellent operators can read CW signals seemingly buried in noise. K0KX comes to mind. John K0UM -- Message: 12 Date: Sun, 27 Nov 2016 05:43:48 + (UTC) From: Al Lorona To: Elecraft Reflector Subject: [Elecraft] [P3] Ability to copy very weak signals Message-ID: <349158864.891997.1480225428...@mail.yahoo.com> Content-Type: text/plain; charset=UTF-8 How are your 'ears'-- your ability to copy very weak CW signals? Here's a way to "measure" your ears. You'll need your panadapter set to a narrow span such as 2 kHz. Turn on averaging so that the noise flattens out to allow you to estimate the true level of the noise. Use a full-screen vertical scale of just a few dB to make it easy to measure small signals just above the noise. Whatever your noise floor is, when a signal creates a 3 dB "bump" above the noise floor, that means the signal and noise are equal (because if you add two equal powers you get twice the power, which is a 3 dB bump). We call this condition a "signal-to-noise ratio of 0 dB". Now tune around the band to find very weak signals and see how much of a bump they make. Here are some rough rules of thumb, rounded off for simplicity: Height of bump above noiseS/N ratio 6 dB 5 dB 53 dB 4 dB2 dB 3.5 dB 1 dB 3 dB0 dB 2.5 dB -1 dB 2 dB -2 dB 1.8 dB -3 dB I listed some negative S/N ratios because I've heard of folks who can copy signals below the noise floor! That's crazy! In any case, this is a very approximate measurement, but it's fun having some idea how well you can actually copy CW at phenomenally low levels. Al W6LX __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] K3 with 2nd RCVR For Sale
For Sale: K3/100 with the following options installed: 100 W internal amplifier KAT3 Internal Antenna Tuner KBPF3 Bandpass filter for continuous Receive Coverage KRX3 Second Receiver One 2.7KHz IF filter KIO3 Computer/Audio Interface KXV3A Transverter Interface KTCXO3-1 TXCO 1 ppm oscillator All manuals included Rarely do they come up for sale with the second RX. All in fine working condition, very clean throughout. Pix available. Asking $2400 plus shipping John K0UM jperl...@ariacorp.com __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
[Elecraft] KIO3 Wanted
I need a KIO3 to repair a K3. If you upgrade to the K3S, you have an extra. Please make me an offer for your used KIO3. John K0UM Jperlick at ariacorp dot com __ 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: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
