New Eham.net K3 review by QRPNEW
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QRPNEW has posted on the K3 before and in both cases he (or she) had a long list of complaints. I have a hard time giving any credence to people who hide who they are and play games with reviews either to make themselves "look good" or "educated" and just bash a product. No product is perfect and yes the K3 will not suit everyone. But if QRPNEW didn't like the K3 in April of 2008 he (or she) should have sold it. By the way I will buy it if QRPNEW wants to sell. If QRPNEW Is so dissatisfied I think I may get a real bargain.
I believe that only valid licensed HAM's should be allowed to post or folks with real names and locations. just my two pennies. Dan AB3EN
Dan AB3EN |
Re: New Eham.net K3 review by QRPNEW
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In reply to this post by Jim Garland
On Mon, Jan 26, 2009 at 08:00:41AM -0700, Jim Garland wrote:
> > > > > > I see that a new review of the K3 has appeared on Eham.net which will no > > doubt raise the hackles of the paid-up members of the Elecraft fan club, > > and > > cause nods of agreement from many others. > > > > http://www.eham.net/reviews/detail/6673 > > > > ----- > > Julian, G4ILO. K2 #392 K3 #222. > > I read the review, and while "QRPNEW" took a few unwarranted pot shots at > the K3, I also thought he made some interesting and valid points. The gist > of his comments is that the K3 can't quite decide whether it wants to be a > small portable transceiver, or a full-sized full-featured base station > transceiver, and in trying to be both it falls short in several respects. Well said. Another thing to consider is that a lot of the review is related to the use of the radio on SSB rather than CW. Elecraft has never had the same overall high-end achievement for phone operation as it has had for CW operation. A $700 used Kenwood TS-850 stands up pretty well against an Elecraft K3 in a phone contest. -- Kenneth E. Harker WM5R [hidden email] http://www.kenharker.com/ _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Actually when 10 meters opened up last Saturday I fired up my 850 for a while on SSB. I went back to the K3. I could get much closer to signals with the K3 without desense. I have been very happy with the K3 using the N8LP Panadaptor. I've been able to get very close to 40 over signals with no problems. My other rigs won't. I use the K3 rx not PwrSdr. I drive the K3 from the PC though. I do wish the K3 was like my Ft2000 was as far as size, etc. BUT I would not go back. On 160 phone I see 40 over signals all of the time with no problems at all. I run phone most of the time. I'm very happy with the K3.
Randy
K8RDD
On Mon, Jan 26, 2009 at 11:40 AM, Kenneth E. Harker <[hidden email]> wrote:
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Re: New Eham.net K3 review by QRPNEW
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In reply to this post by Simon (HB9DRV)
> I too would have bought a K4 variant were it available - the K3 with a
> full-sized front panel. One future possibility is to merge K3 and TS-480 technologies to allow the end-user the purchase of a control panel as a remote head -- and offer it in small, medium and large sizes. The data to/from the base unit to the panel remains the same, regardless of the panel. One base module fits all. It's the panel that picks off the appropriate data based on number of panel knobs, switches and display type. The technology and feasibility are already here: The TS-480 has allowed many of us to plug the '480's remote head into our laptop USB jacks (through a simple FTDI data converter) and control the station from thousands of miles away -- and yet still have the look and feel of the real rig sitting in front of you, complete with panel switches and a VFO knob to spin. I take a small Pelican case with me on my travels that contains the TS-480 control head, WinkeyUSB keyer (w/ local CW sidetone injection), Begali Traveler paddle, and a collapsible set of Sony headphones. That, together with my Dell notebook PC allows for all-mode operation, including the use of CW paddles from anywhere I can find a Wi-Fi connection. In the case of the TS-480, there's not a whole lot inside the control head and I could see three inexpensive panels being offered into a future Elecraft product at a reasonable price. Then, as you go from mobile, to portable, to base operation, one just picks the appropriate panel size. Allowing the selction of economical panel sizes is an untapped feature with an awful lot of powerful capabilities. Paul, W9AC _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: New Eham.net K3 review by QRPNEW
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In reply to this post by w0mu
----- Original Message -----
From: "W0MU Mike Fatchett" <[hidden email]> > > I own two FT-2000's and they do look cool and work fine but they don't > work > as well as the K3. > FT-2000 has a nice UI - a big shame the performance of the receiver isn't so good. I think it was due to cost-cutting, not original design. It's interesting to see Yaesu bringing out the FTDX-9000PEP upgrades, maybe the next generation of FT-2000 will offer better performance. Simon Brown, HB9DRV www.ham-radio-deluxe.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: New Eham.net K3 review by QRPNEW
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In reply to this post by P.B. Christensen
----- Original Message -----
From: "Paul Christensen" <[hidden email]> > > One future possibility is to merge K3 and TS-480 technologies to allow the > end-user the purchase of a control panel as a remote head -- and offer it > in > small, medium and large sizes. I agree 100% - when I first saw the TS-480SAT I thought it was a joke - my friend Peter PH1PH (SK) bought one. After he died I bought one, then another. Simon Brown, HB9DRV www.ham-radio-deluxe.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: New Eham.net K3 review by QRPNEW
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In reply to this post by K8RDD
It occurred to me also that this anonymous review may have been posted by a
competitor... I don't do much SSB operating on my K3, but I was struck by the comments about splatter on SSB. Given the comments about ALC, this suggests to me that the guy doesn't know how to drive an amplifier. Most amps don't require ALC feedback if you adjust them correctly in the first place. More important, ALC doesn't always work well. You really have to design both circuits together for it to work properly, and that's obviously not the case when you pair random transceivers and amplifiers. Not clear that the guy did the ALC mod, but even if he did it's not guaranteed to produce optimum results under all conditions. With amps out of sight in the basement, he's probably overdriving them and/or not tuning them properly for maximum gain, and thus creating splatter. 73, Dick WC1M _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Bruce McLaughlin-2
Bruce McLaughlin wrote:
> We are assuming he actually owns the radio. That may be unwarranted. It's > obvious from the review that he does not much like the radio. I am curious > about what is really going on. It looks to me as though the guy looked through the reflector archives, picked out every complaint that had ever been made about the K3 and stitched up this 'review'. Some of them are out of date, having been fixed in firmware or have hardware mods available. Having said that, the K3 is a sports car and not a family sedan. Or, probably closer to what the designer had in mind, a racing bicycle and not a 'cruiser bike'. Which doesn't mean that it's 'uncomfortable'. Try riding 100 miles against the wind in hilly terrain on a cruiser bike. So either you like it for what it is or you don't. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Simon (HB9DRV)
I just looked and there is a pep upgrade on the 2000's now and updates for
the dmu. -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Simon (HB9DRV) Sent: Monday, January 26, 2009 10:54 AM To: [hidden email] Subject: Re: [Elecraft] New Eham.net K3 review by QRPNEW ----- Original Message ----- From: "W0MU Mike Fatchett" <[hidden email]> > > I own two FT-2000's and they do look cool and work fine but they don't > work as well as the K3. > FT-2000 has a nice UI - a big shame the performance of the receiver isn't so good. I think it was due to cost-cutting, not original design. It's interesting to see Yaesu bringing out the FTDX-9000PEP upgrades, maybe the next generation of FT-2000 will offer better performance. Simon Brown, HB9DRV www.ham-radio-deluxe.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: New Eham.net K3 review by QRPNEW
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In reply to this post by Dick Green WC1M
-----Original Message----- It occurred to me also that this anonymous review may have been posted by a competitor... 73, Dick WC1M -------------------------- I'm more inclined to think it was posted by a competitor's "fan boy". I don't see TenTec doing anything like this, and I don't see why the Asian companies would bother either. No, I think it is someone who truly doesn't like the K3. Is the person a knowledgeable user or just someone with a K3 chip on their shoulder, who knows. There is some truth the criticisms but all the other stuff mixed in sure makes the review at odds with my (most of our) experience with the rig. Come to think of it, maybe my K3 really is a junky radio. After all, it doesn't weight enough and when I use it for CW late at night, I just can't copy the code like I can in the day when I'm more awake. Sending CW with a bug is difficult and the rig produces horrible distorted audio with AF maxed and the little volume control on my headphones turned waaaay down. Yea, junky rig. I think I'll sell it and buy a Swan 350 to get that nice warm tube sound. - Keith N1AS - - K3 711 - _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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My grandfather owned a swine three drifty. I disposed of it quite some time
ago. Yikes! -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Darwin, Keith Sent: Monday, January 26, 2009 11:29 AM To: Elecraft Reflector Subject: Re: [Elecraft] New Eham.net K3 review by QRPNEW -----Original Message----- It occurred to me also that this anonymous review may have been posted by a competitor... 73, Dick WC1M -------------------------- I'm more inclined to think it was posted by a competitor's "fan boy". I don't see TenTec doing anything like this, and I don't see why the Asian companies would bother either. No, I think it is someone who truly doesn't like the K3. Is the person a knowledgeable user or just someone with a K3 chip on their shoulder, who knows. There is some truth the criticisms but all the other stuff mixed in sure makes the review at odds with my (most of our) experience with the rig. Come to think of it, maybe my K3 really is a junky radio. After all, it doesn't weight enough and when I use it for CW late at night, I just can't copy the code like I can in the day when I'm more awake. Sending CW with a bug is difficult and the rig produces horrible distorted audio with AF maxed and the little volume control on my headphones turned waaaay down. Yea, junky rig. I think I'll sell it and buy a Swan 350 to get that nice warm tube sound. - Keith N1AS - - K3 711 - _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: New Eham.net K3 review by QRPNEW
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W0MU Mike Fatchett wrote:
> My grandfather owned a swine three drifty. I disposed of it quite some time > ago. Yikes! > LoL Swine Three Drifty :))) Love it... 73 , Deni F5VJC K3# 325 I really love it... _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Tom Wylie
I never believe anything from an anonymous
source..... (((He has posted here in the last few days....look back you will see it)) My view is different than his but he does have a right to his opinion. I sure don't buy or discount a rig from an EHAM review. Jim KE4WY -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Tom Wylie Sent: Monday, January 26, 2009 10:08 AM To: Bruce McLaughlin Cc: [hidden email] Subject: Re: [Elecraft] New Eham.net K3 review by QRPNEW I am happy with MY K3. I never believe anything from an anonymous source..... It shall be filed in the round file where it belongs. Tom GM4FDM Bruce McLaughlin wrote: > One of the more amazing aspects of that review was his claim that he did not > know the size of the K-3 before he ordered it. It's size is certainly not > kept a secret. Apparently, he does not bother to read the literature before > he buys something. That's incredible. > > As far as the performance aspects he mentions, I don't know what radio he > was using (if in fact he was using a radio) but it certainly does not > remotely resemble either of my K-3s. His comments about a perceived need to > constantly re-center the roofing filters causes me to wonder whether he has > any idea of what roofing filters are supposed to do or how they work. But > mainly, I truly wonder if he is ever actually operated the K-3. While he > was at it, I am rather surprised he did not give it a rating of 0/5 rather > than the 3/5. > > His remarks are so foreign to what many other owners, the ARRL and Sherwood > engineering, not forgetting W8JI have all noted with respect to the radio > that one has to wonder about his motives in making the comments. Certainly, > he is entitled to his opinion just as we are entitled to read it and forget > it. > > Bruce-W8FU > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of Julian, G4ILO > Sent: Monday, January 26, 2009 9:15 AM > To: [hidden email] > Subject: [Elecraft] New Eham.net K3 review by QRPNEW > > > I see that a new review of the K3 has appeared on Eham.net which will no > doubt raise the hackles of the paid-up members of the Elecraft fan club, > cause nods of agreement from many others. > > http://www.eham.net/reviews/detail/6673 > > ----- > Julian, G4ILO. K2 #392 K3 #222. > http://www.g4ilo.com/ G4ILO's Shack http://www.ham-directory.com/ Ham > Directory http://www.g4ilo.com/kcomm.html KComm for Elecraft K2 and K3 > -- So I met the bloke who invented crosswords today. I can't remember his name, it's P something T something R. --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 090125-0, 25/01/2009 Tested on: 26/01/2009 15:08:09 avast! - copyright (c) 1988-2009 ALWIL Software. http://www.avast.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: New Eham.net K3 review by QRPNEW
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In reply to this post by Bruce McLaughlin-2
I have read the comments on the QRPNEW review and while I support
someone's right to disagree with what I find true, I believe in accountability. That anonymous postings on a review site I use to gather information prior to purchasing is allowed to occur is most disturbing and cheapens the quality of the Eham review score. I sent the email below to the manager of the EHam reviews and you might be inclined to follow suit, use your own words but if it matters to you, then let him know your feelings. 73, Gary KA1J -------Email below------- Hi Phil, Thought I would pass my 2 cents on to you; I have an Elecraft K3 which I personally find to be the finest transceiver I have ever operated. I frequent the Elecraft reflector and the current comment is about a review on EHam on the Elecraft K3 topic. The review was by "QRPNEW" and placed there on Jan 26, 2009: http://www.eham.net/reviews/detail/6673 The review is to me, written as if the person knows little about the radio and more as if the person has an agenda against it. The radio costs so much that it is most difficult to imagine someone would buy something they obviously never researched. Much they complain about in this most lengthy review is not true with my radio and flies in the positive reviews by pretty much everybody else. I understand we are all entitled to our own opinions but as some of the writers on the Elecraft reflector have mentioned, prior to being allowed to write a review on Eham, the person should be a licensed amateur and member of EHam and not allowed to be an anonymous poster. I agree with this whole-heartedly. By the hostility in that review some on the reflector have suggested it sounds like it was written by an Elecraft competitor with a vested interest in un-truths about a successful competitor. Re-reading the article with that in mind, it sounds plausible but I have no way to know the writer's true intent. My reason for writing to you as manager of the EHam reviews is to encourage you to put a stop to anonymous postings on EHam reviews, a dunning report by someone who can do so to lower a score maliciously without accountability affects the good will of the EHam review. FWIW, I have zero connection to Elecraft other than I have bought the K3 as a kit, assembled it myself and have bought all the options it offers and installed them myself. I did not get a price break and paid full price for all of it. Thank you for your considerations, Gary KA1J _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: New Eham.net K3 review by QRPNEW
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In reply to this post by Julian, G4ILO
I made some A/B testing in CQ160 last weekend, between K2 and TS-850S. They hear pretty good the same but it's much easier to copy week signals with K2 if you have S9+ signal close to you.
I suppose that K3 is even better...
Samir, 7S7V
Message: 29 Date: Mon, 26 Jan 2009 11:55:52 -0500 From: Randy Downs <[hidden email]> Subject: Re: [Elecraft] New Eham.net K3 review by QRPNEW To: "Kenneth E. Harker" <[hidden email]>, [hidden email] Message-ID: <[hidden email]> Content-Type: text/plain; charset="iso-8859-1" Actually when 10 meters opened up last Saturday I fired up my 850 for a while on SSB. I went back to the K3. I could get much closer to signals with the K3 without desense. I have been very happy with the K3 using the N8LP Panadaptor. I've been able to get very close to 40 over signals with no problems. My other rigs won't. I use the K3 rx not PwrSdr. I drive the K3 from the PC though. I do wish the K3 was like my Ft2000 was as far as size, etc. BUT I would not go back. On 160 phone I see 40 over signals all of the time with no problems at all. I run phone most of the time. I'm very happy with the K3. Randy K8RDD On Mon, Jan 26, 2009 at 11:40 AM, Kenneth E. Harker <[hidden email] > wrote: > On Mon, Jan 26, 2009 at 08:00:41AM -0700, Jim Garland wrote: > > > > > > > > > > I see that a new review of the K3 has appeared on Eham.net which will > no > > > doubt raise the hackles of the paid-up members of the Elecraft fan > club, > > > and > > > cause nods of agreement from many others. > > > > > > http://www.eham.net/reviews/detail/6673 > > > > > > ----- > > > Julian, G4ILO. K2 #392 K3 #222. > > > > I read the review, and while "QRPNEW" took a few unwarranted pot shots at > > the K3, I also thought he made some interesting and valid points. The > gist > > of his comments is that the K3 can't quite decide whether it wants to be > a > > small portable transceiver, or a full-sized full-featured base station > > transceiver, and in trying to be both it falls short in several respects. > > Well said. > > Another thing to consider is that a lot of the review is related to the > use of the radio on SSB rather than CW. Elecraft has never had the same > overall high-end achievement for phone operation as it has had for CW > operation. A $700 used Kenwood TS-850 stands up pretty well against an > Elecraft K3 in a phone contest. > > -- > Kenneth E. Harker WM5R > [hidden email] > http://www.kenharker.com/ _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Jan Erik Holm
Which reminds me...I set my power supply to deliver 14.5V at the input to my K3 terminals under load. Although the power supply specification says... "Supply Voltage/current: 13.8 V nominal during TX. (11 V min, 15 V max). 17-22 Amps typical in TX (100W). 0.9A minimum RX." ...I would never intentionally run mine at the lower end of that range. If you have any concerns about overshoot when turning on your power supply, always turn the PS on a few seconds before the K3. I tend to leave my PS on continuously so overshoot is never an issue. IMD performance should be much better at the upper end of the voltage spec than at the low end...and I believe I've seen Eric or Wayne recommend this previously but have not searched for the exact quote. I'll let you tell W8JI he's not knowledgeable and intelligent. ;-) 73, Bill |
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In reply to this post by Gary Smith
Some eHam regulars have been trying to get that done for YEARS.
The attempts have always fallen on deaf ears. As long as your a member, anonymous (no call sign) or not you can post a review. I automatically discount/ignore reviews there from anonymous reviewers and those who haven't used the hardware for at least six months. Did QRPNEW happen to post the serial number of the offending K3? Gary Smith wrote: > I have read the comments on the QRPNEW review and while I support > someone's right to disagree with what I find true, I believe in > accountability. That anonymous postings on a review site I use to > gather information prior to purchasing is allowed to occur is most > disturbing and cheapens the quality of the Eham review score. > > I sent the email below to the manager of the EHam reviews and you > might be inclined to follow suit, use your own words but if it > matters to you, then let him know your feelings. > > 73, > Gary > KA1J -- R. Kevin Stover, ACØH _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Bill W4ZV
> Jan Erik Holm wrote: > > > > Bill and others, hold on and think about these > > figures. -35 to -38 dB IM3 !! We are dealing > > with 2SC2782 transistors operating at around > > 12V DC. I say no more, the knowledge and intelligent > > individual will understand. I would be careful here ... the Toshiba 2SC2879 data sheet clearly does -38dB IMD at 60 watts with VCC=12.5V. There are certainly devices capable of that level of performance means that there are devices capable of that level just as there are devices capable of similar levels of performance at 120-140 watts per device with Vcc=28V. I would expect the 2SC2879 to also be capable of this level of performance ... if not, I would have expected the design of the KPA3 to have been based on another device. 73, ... Joe, W4TV > -----Original Message----- > From: [hidden email] > [mailto:[hidden email]] On Behalf Of Bill W4ZV > Sent: Monday, January 26, 2009 4:18 PM > To: [hidden email] > Subject: [Elecraft] SSB IMD > > > > > > Jan Erik Holm wrote: > > > > Bill and others, hold on and think about these > > figures. -35 to -38 dB IM3 !! We are dealing > > with 2SC2782 transistors operating at around > > 12V DC. I say no more, the knowledge and intelligent > > individual will understand. > > > > Which reminds me...I set my power supply to deliver 14.5V at > the input to my K3 terminals under load. Although the power > supply specification says... > > "Supply Voltage/current: 13.8 V nominal during TX. (11 V min, > 15 V max). 17-22 Amps typical in TX (100W). 0.9A minimum RX." > > ...I would never intentionally run mine at the lower end of > that range. If you have any concerns about overshoot when > turning on your power supply, always turn the PS on a few > seconds before the K3. I tend to leave my PS on continuously > so overshoot is never an issue. > > IMD performance should be much better at the upper end of the > voltage spec than at the low end...and I believe I've seen > Eric or Wayne recommend this previously but have not searched > for the exact quote. > > I'll let you tell W8JI he's not knowledgeable and intelligent. ;-) > > 73, Bill > > -- > View this message in context: > http://n2.nabble.com/New-Eham.net-K3-review-by-QRPNEW-tp221808 Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Bill W4ZV
<quote author="Bill W4ZV"> Which reminds me...I set my power supply to deliver 14.5V at the input to my K3 terminals under load. Although the power supply specification says... "Supply Voltage/current: 13.8 V nominal during TX. (11 V min, 15 V max). 17-22 Amps typical in TX (100W). 0.9A minimum RX." Not to hijack the review thread, but if I set my MFJ-4245MV power supply output to no lower than 14.5V on the K3's internal meter when receiving (and same at the output posts), under full transmit load the indicated voltage drops on the K3's meter to 13.8V, and to 14.35 at the power supply output on my uncalibrated DVOM. If set to 13.8V output, under full load it indicates 12.9V on the rig, and 13.65V at the power supply. Not sure where the K3 meter gets it's data. It might be worth exploring in another thread what effect on transmitter electrical performance there is, if any, when the power supply output is nominally set at only 13.8V, and then drops under load almost a volt. BTW, reviewers in the E-HAM ads are entitled to their opinions, but proper ID adds reader confidence. The review to me reads grossly negative without substantiation. For example, in my opinion his comments about the dual NB efficacy are little more than a broadside rant, and display a lack of understanding about the NB utility, if my positive experience with their use is any indication. The rest of the review may reflect similar unsubstantiated opinions. The K3 is not perfect, but compared with the others that have passed through my shack, including most of the new JA DSP radios, it's a keeper with a built-in potential for evolution. 73 Gary NL7Y |
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In reply to this post by Joe Subich, W4TV-4
Yes I´ve seen those figures, there are are lot of
data from component manufactures however by the time we see the finished product data doesn´t even come close. I tried to look for the data on the FT-990 that K6LL informed about but couldn´t find it. I was thinking what reference level they used, I think I remember ARRL changed their procedure, the -38 prity well could be -32 in real life. However, something struck me, why is it we see this big variation in data on the IMD3? We have a spread between -38 to -24 dB. A number of people has measured below -30 dB and as far as I know "only" one around -38 dB. Who is right and who is wrong? Is there something critical in the radio that gives this outcome? Critical adjustment perhaps? Is it very sensitive what PS we use (ala W4ZV)? As I said before, here I am first time on 20m SSB and people report trash around my signal, i e bad IMD. However at that time I had K3 at 120W, aftter I´ve made measurements and it looks like something slowly starts to happen at 80W. Also I have myself heard K3´s on SSB with "trash" around the signal "however" I have also heard K3´s that did NOT have that. So what´s going on here, I´m getting reel puzzled and frankly quite tired of this. I wish there would be a "service manual" available, like there is for any Japanese rice box. I mean a manual that contains all data for all adjustments. Why not?? / Jim SM2EKM --------------------------- Joe Subich, W4TV wrote: > >> Jan Erik Holm wrote: >>> Bill and others, hold on and think about these >>> figures. -35 to -38 dB IM3 !! We are dealing >>> with 2SC2782 transistors operating at around >>> 12V DC. I say no more, the knowledge and intelligent >>> individual will understand. > > I would be careful here ... the Toshiba 2SC2879 data sheet > clearly does -38dB IMD at 60 watts with VCC=12.5V. There > are certainly devices capable of that level of performance > means that there are devices capable of that level just as > there are devices capable of similar levels of performance > at 120-140 watts per device with Vcc=28V. > > I would expect the 2SC2879 to also be capable of this level > of performance ... if not, I would have expected the design > of the KPA3 to have been based on another device. > > 73, > > ... Joe, W4TV > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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