Linear thoughts
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I'm totally with these suggestions. A separate power supply that can be
positioned away from the operating desk would be, IMO, very desirable. An internal tuner option sounds nice. But may be difficult as the components for 1500 watts get kind of big. I think it would be very desirable, but may not be practical unless we are willing to accept a larger box. There have been an awful lot of great suggestions. Most important to me are: 2 inputs, 4 outputs. Inputs are RF sensing. No switch selecting needed to transmit from transceiver A or B. Remembers band, output level, and antenna selection for each input. I think a weather proof tuner is a whole other issue. One I would like to see. Doug -- K0DXV On 3/17/2017 6:20 PM, Gary K9GS wrote: > A lot of great suggestions but two I have not seen discussed: > > 1) I really like the idea of a separate power supply simply because > if the amp has to ever go in for service or be shipped it is a lot > easier without a heavy power supply inside the cabinet. Just send the > RF deck to Elecraft. > > 2) I like the idea of an optional INTERNAL tuner. Makes it nice and > clean for those that need a tuner without a rats nest of Y cables, > etc. If there is going to be an external tuner make it weatherproof > so you can put it OUTSIDE. > > I would love a 1.5K+ amp with a K3 type legal limit tuner I can put > outside. > > > > On 3/17/2017 6:59 PM, Fred Jensen wrote: >> The "KPA1500" should look, feel, and behave like a KPA500. OK, it >> can weigh a little more but should be liftable by your average age >> ham [oldish]. If you want to sell it widely, the "KAT1500" will also >> be needed since there are a whole bunch of folks who have less than >> monoband stacks on all bands, but it needs to be either an internal >> or external option, some won't need it. >> >> Fans should make no noise whatsoever, even on high speed. Rated for >> 100% duty cycle to accommodate RTTY, JT65, and 75 meter AM looong >> transmissions. It shouldn't cost more than 3 times a KPA500, same >> $/watt. It should accept higher VSWR's than the KPA500, say maybe >> 3:1? A plus would be operation on a 20A 120V circuit and/or a >> sagging generator. Needless to say, full perfect QSK at 110 WPM, >> zero IMD, and be able to eliminate TX phase noise if used with some >> notable non-Elecraft transmitters. An LCD display for a trapezoid >> pattern to assure linearity would be a plus but not essential since >> it's going to be perfectly linear anyway. >> >> Very tough market to enter, and potential customers can be so very >> fickle. >> >> 73, >> >> Fred ("Skip") K6DGW >> Sparks NV USA >> Washoe County DM09dn >> >> PS: Before blood pressures rise, paragraph 2 is a feeble [very] >> attempt at some humor based on passages on this list. A deep breath >> or two would be best. I believe paragraph 3 is true however, and I >> really want to see Elecraft stay in business. >> >>> On Fri,3/17/2017 10:06 AM, Eric Swartz - WA6HHQ, Elecraft wrote: >>>> Folks, if we did introduce a 1500 W solid state amp similar to our >>>> KPA500 in operation, what features etc would be important? >>> >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [hidden email] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by k6mrmagnet
I went to his "website" and wound up downloading the famous, "your PC is infected, call Microsoft immediately" message. I did a hard shut down without clicking on any thing on the desktop, not infected. So be careful with this suggestion.
73, Bill K9YEQ -----Original Message----- From: Elecraft [mailto:[hidden email]] On Behalf Of Ken K6MR Sent: Saturday, March 18, 2017 2:09 PM To: Dan Baker <[hidden email]>; [hidden email] Subject: Re: [Elecraft] Linear thoughts Check out the web page of NX1P. Reasonably simple mods to add a few dB of gain to the KPA500 and allows full power with KX3 drive. I modified both my KPAs because I do run them in parallel and needed a bit more gain on the higher bands. Ken K6MR From: Dan Baker<mailto:[hidden email]> Sent: Saturday, March 18, 2017 9:32 AM To: [hidden email]<mailto:[hidden email]> Subject: Re: [Elecraft] Linear thoughts It would be very nice to have the ability to make a unauthorized, unofficial simple mod. Maybe call it the KX3 mod. This mod would allow one to drive the amp to full output with a KX2 or KX3. Dan KM6CQ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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I signed up on NX1P web site and tried to log in and a pop up said I was black listed while logging in.
I think I'll stay way also. Keith |
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The website appears infected based on our experiences
Have a great day! Bill J ________________________________ From: Elecraft <[hidden email]> on behalf of KV5J via Elecraft <[hidden email]> Sent: Saturday, March 18, 2017 6:55:24 PM To: [hidden email] Subject: Re: [Elecraft] Linear thoughts I signed up on NX1P web site and tried to log in and a pop up said I was black listed while logging in. I think I'll stay way also. Keith -- View this message in context: http://elecraft.365791.n2.nabble.com/Linear-thoughts-tp7628069p7628254.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Are you going to nx1p.net? I don’t see anything unusual here.
Ken K6MR From: Bill Johnson<mailto:[hidden email]> Sent: Saturday, March 18, 2017 5:05 PM To: KV5J<mailto:[hidden email]>; KV5J via Elecraft<mailto:[hidden email]> Subject: Re: [Elecraft] Linear thoughts The website appears infected based on our experiences Have a great day! Bill J ________________________________ From: Elecraft <[hidden email]> on behalf of KV5J via Elecraft <[hidden email]> Sent: Saturday, March 18, 2017 6:55:24 PM To: [hidden email] Subject: Re: [Elecraft] Linear thoughts I signed up on NX1P web site and tried to log in and a pop up said I was black listed while logging in. I think I'll stay way also. Keith -- View this message in context: http://elecraft.365791.n2.nabble.com/Linear-thoughts-tp7628069p7628254.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Bill K9YEQ
Her website.
Her copywrited paper is also available at: http://www.oz6hq.dk/userfiles/downloads/kpa500%20mods.pdf Shows details about her modification to add 2.5 db gain by eliminating the input attenuator and modifying the sensor circuit to keep the protection circuit - protecting. Elecraft disavows modifying the KPA500 for stability and FCC rules violation by the manufacture reasons, at least while the silly 15 db rule is in effect. Hopefully the FCC will get around to the elimination of the 15 db rule in the present NPR. I believe my Harris analog TV PAs were in the 20 db gain region - apx 10 watts in for a kilowatt out. I believe the digital PAs were lower gain to run as class A (or very close to class A). From the analog exciter output to IPA to PA to low-pass/filterplexer output it was from 250 mw to 30 kw. That would be over 50 db gain! And that system was type accepted. 73 George - AI4VZ -----Original Message----- From: Bill Johnson I went to his "website" and wound up downloading the famous, "your PC is infected, call Microsoft immediately" message. I did a hard shut down without clicking on any thing on the desktop, not infected. So be careful with this suggestion. 73, Bill K9YEQ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by k6mrmagnet
Apparently not but your suggestion led us to infected sites. Thank you for proper URL! It works!
Bill K9YEQ From: Ken K6MR [mailto:[hidden email]] Sent: Saturday, March 18, 2017 7:40 PM To: Bill Johnson <[hidden email]>; KV5J <[hidden email]>; KV5J via Elecraft <[hidden email]> Subject: RE: [Elecraft] Linear thoughts Are you going to nx1p.net? I don't see anything unusual here. Ken K6MR From: Bill Johnson<mailto:[hidden email]> Sent: Saturday, March 18, 2017 5:05 PM To: KV5J<mailto:[hidden email]>; KV5J via Elecraft<mailto:[hidden email]> Subject: Re: [Elecraft] Linear thoughts The website appears infected based on our experiences Have a great day! Bill J ________________________________ From: Elecraft <[hidden email]<mailto:[hidden email]>> on behalf of KV5J via Elecraft <[hidden email]<mailto:[hidden email]>> Sent: Saturday, March 18, 2017 6:55:24 PM To: [hidden email]<mailto:[hidden email]> Subject: Re: [Elecraft] Linear thoughts I signed up on NX1P web site and tried to log in and a pop up said I was black listed while logging in. I think I'll stay way also. Keith -- View this message in context: http://elecraft.365791.n2.nabble.com/Linear-thoughts-tp7628069p7628254.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email]<mailto:[hidden email]> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email]<mailto:[hidden email]> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Doug Person-4
Hi All, nx1p.com and nx1p.net are not infected. I had raised my security setting to detect potential blacklisted IP address ranges due to a DNS attack by dot ru addresses. That setting was to high and I have removed the blacklist IP check. Those who had problems registering should be able to access now. If not, please email me and I will take care of the password issues.
Thanks Paula NX1P |
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In reply to this post by Eric Swartz - WA6HHQ
Eric,
That's easy, #1 requirement should be spectral purity at full smoke. So simply take the features and functions of the KPA500 and increase output to 1500W PEP. I'd not like to see Elecraft waste their time with an Spurious/IMD spec that only just pass the FCC requirements, it's about time someone showed leadership here. At the very least I'd expect to see Spurious emissions 60dB (or more) below PEP and IMD 30dB (or more) below PEP across all bands, I'll admit this is not easy to do from 1.8-50MHz but it's also not impossible. This is the minimum commercial spec for 1kW HF gear here in VK already, for inspiration Codan 3062 or LINEARamp Gemini. However it's not easy especially since the FCC ties your hands behind your backs in terms of gain from the get go. The nice to haves (wish list) would be; - Four antenna output with an internal tuner that could flatten antennas that creep up towards 3:1 at the band edges (ala alpha 9500 series) - Limit the weight of the KPA1500 to the same as the KPA500 is now (preferably lighter) so switchmode PSU's this time please. - Make allowances for those countries that aren't limited to FCC 13dB gain, we'd be happy with just 16dB (*30-40W grin*) and let us pocket the IMD/Spurious improvements If Elecraft were to make such an amp with this sort of spectral purity I'd be inclined to complete the necessary paperwork for a high power variation on my license here in VK and purchase an amp. I've toyed with the Gemini Amp a couple of times but the integration of the KPA500 eventually tipped the balance. Then all we've got to do is get more people pointing their beams at us during DXpeditions and Contests and we'd be set. 73 Matthew VK5ZM On 18 March 2017 at 03:36, Eric Swartz - WA6HHQ, Elecraft <[hidden email] > wrote: > Interesting discussion. > > Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 > in operation, what features etc would be important? > > 73, > Eric > /elecraft.com/ > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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I think the FCC is going to change the rules on the gain factor,
hopefully soon. 1500w out on RTTY with zero limitations on duty cycle or very little limitation. Very quiet cooling. 6m would be nice but probably an issue at that power. Price is probably the biggest what if. No tune obviously. Built in tuner. If you can make the amp like 3:1 SWR's great then no tuner. I would love to be able to share the amp with my 2nd K3. SO2R or similar type operations. I would be ok with a separate power supply separate from the amp part to keep the size as small as possible. Fully remote controllable with USB/Ethernet including an on off function or reset. W0MU On 3/23/2017 11:46 PM, Matthew Cook wrote: > Eric, > > That's easy, #1 requirement should be spectral purity at full smoke. So > simply take the features and functions of the KPA500 and increase output to > 1500W PEP. I'd not like to see Elecraft waste their time with an > Spurious/IMD spec that only just pass the FCC requirements, it's about time > someone showed leadership here. At the very least I'd expect to see > Spurious emissions 60dB (or more) below PEP and IMD 30dB (or more) below > PEP across all bands, I'll admit this is not easy to do from 1.8-50MHz but > it's also not impossible. This is the minimum commercial spec for 1kW HF > gear here in VK already, for inspiration Codan 3062 or LINEARamp Gemini. > However it's not easy especially since the FCC ties your hands behind your > backs in terms of gain from the get go. > > The nice to haves (wish list) would be; > > - Four antenna output with an internal tuner that could flatten antennas > that creep up towards 3:1 at the band edges (ala alpha 9500 series) > - Limit the weight of the KPA1500 to the same as the KPA500 is now > (preferably lighter) so switchmode PSU's this time please. > - Make allowances for those countries that aren't limited to FCC 13dB > gain, we'd be happy with just 16dB (*30-40W grin*) and let us pocket the > IMD/Spurious improvements > > If Elecraft were to make such an amp with this sort of spectral purity I'd > be inclined to complete the necessary paperwork for a high power variation > on my license here in VK and purchase an amp. I've toyed with the Gemini > Amp a couple of times but the integration of the KPA500 eventually tipped > the balance. > > Then all we've got to do is get more people pointing their beams at us > during DXpeditions and Contests and we'd be set. > > 73 > > Matthew > VK5ZM > > On 18 March 2017 at 03:36, Eric Swartz - WA6HHQ, Elecraft <[hidden email] >> wrote: >> Interesting discussion. >> >> Folks, if we did introduce a 1500 W solid state amp similar to our KPA500 >> in operation, what features etc would be important? >> >> 73, >> Eric >> /elecraft.com/ >> >> >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[hidden email] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [hidden email] >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Besides the usual things nearly every other hi-end linear has:
- tuner built-in as an option - really light weight - at least 90% efficiency - one, max 2 antenna ports (these fit into the portable rig philosophy of Elecraft) 73 Arie PA3A ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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I want to echo that a KPA-1500 be the same as the KPA500 in terms of
ease of use and interface, solid state, QSK switching, etc. Some of my points: Some have said "at least 1000W". In my opinion, that is not a big enough step above the KPA500, but some will make the case that 1500 isn't either, but at least it is the max allowed. If you're going to sell an amp above the KPA500 make it full legal limit. Leverage what you can from the KPA500, but at the same point, the KPA500 design is getting a little old. A lot has happened in high power solid state RF electronics since then. I would prefer that the amp be based on LDMOS RF Power transistors. Perhaps the MRF1K50HR5 from NXP Semiconductors should be considered. LDMOS is known for great linearity and the latest devices are pretty rugged. If you do invest in a newer design, consider some backwards leverage from the KPA1500 (if that is what you call it) to the KPA500, i.e. an updated KPA500 V2 that leverages some of the new design and perhaps makes supporting the two amps easier. I may never buy a KPA1500, but I once said that I would never want more than 100W when I bought the KXPA100, but now I own a KPA500/KAT500! 73, John AC0ZG On 3/24/2017 4:11 AM, Arie Kleingeld PA3A wrote: > Besides the usual things nearly every other hi-end linear has: > - tuner built-in as an option > - really light weight > - at least 90% efficiency > - one, max 2 antenna ports > > (these fit into the portable rig philosophy of Elecraft) > > 73 > Arie PA3A > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Arie Kleingeld PA3A-2
Perhaps a new, legal limit power amplifier should be non-linear so as to
achieve very high efficiency. Broadcasters seem to use such designs routinely, and the latest QEX described a ham version under development. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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