[Elecraft] KPA-1500 Efficiency As A Function of Input Power
Thanks for the replies. Upon further testing, I have found that the efficiency of the KPA-1500 is varies greatly with driving power. The following table illustrates the relationships between exciter power, voltage, current, power-in(voltage x amps), power-out, efficiency, and dissipated power. The following test was made with the KPA-1500 into a dummy load and readings from the KPA-1500 utility software. (Exciter)(Amps) (Voltage) (Power-In) (Power-Out) (Efficiency Pout/Pin) (Dissipated Pwr) 10w 29a 52.7v 1528w 375W375/1528 = 24.5% 1205w 15w 37a 52.7v 1950w 620w620/1950 = 31.7% 1335w 20w 43a 52.6v 2262w 861w861/2262 = 38.0% 1413w 25w 47a 52.6v 2472w 1060w 1060/2472 = 42.8% 1451w 30w 51a 52.6v 2682w 1227w 1227/2682 = 45.7% 1420w 35w 53a 52.5v 2782w 1380w 1380/2782 = 49.5% 1412w 40w 55a 52.5v 2887w 1497w 1497/2887 = 51.9% 1382w 45w 56a 52.5v 2940w 1600w 1600/2940 = 54.4% 1313w 50w 57a 52.5v 2992w 1703w 1703/2992 = 56.9% 1315w 53w 59a 52.5v 3097w 1825w 1825/3097 = 58.9% 1306w The remarkable thing is that DISSIPATED POWER appears to be relatively constant from 375w output through 1825w output. This implies the KPA-1500 will need to dissipate nearly the same amount of heat at low power output as at high power output, if I am interpreting the data correctly. I would like to know from Elecraft if this is normal behavior. Charles K5UA __ 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 changes modes
Sounds like an issue with the WSJT-X (Hamlib) software not the KPA-1500. I suggest you take the matter up with the developers or WSJT-X and hamlib 73, ... Joe, W4TV On 2018-08-16 1:10 PM, Richard Zalewski wrote: I have been experiencing an intermittent problem with the KPA-1500, TS-990. When running WSJT-X (USB) occasionally the 990 goes to AM-D1 mode. No reason I can see for it to do that. It does this in RECEIVE. Just to be sure however I put lots of ferrite on all leads involved.. Richard *W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU, J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, XE2DV __ 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 changes modes
HI, My experience is that you should use OmniRig as the control in WSJT-X. Do not use HamLib. 73 -Original Message- From: Richard Zalewski Sent: Thursday, August 16, 2018 1:10 PM To: Elecraft Reflector Subject: [Elecraft] KPA-1500 changes modes I have been experiencing an intermittent problem with the KPA-1500, TS-990. When running WSJT-X (USB) occasionally the 990 goes to AM-D1 mode. No reason I can see for it to do that. It does this in RECEIVE. Just to be sure however I put lots of ferrite on all leads involved.. Richard *W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU, J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, XE2DV *Be joyful in hope, patient in affliction, faithful in prayer* __ 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 tom...@videotron.ca --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus __ 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] KPA-1500 changes modes
I have been experiencing an intermittent problem with the KPA-1500, TS-990. When running WSJT-X (USB) occasionally the 990 goes to AM-D1 mode. No reason I can see for it to do that. It does this in RECEIVE. Just to be sure however I put lots of ferrite on all leads involved.. Richard *W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU, J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, XE2DV *Be joyful in hope, patient in affliction, faithful in prayer* __ 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] K3
Thread closed. Folks, please keep politics out of ALL discussions on this reflector. This is an area clearly outside the reflector topic guidelines. Also please keep postings respectful regarding other countries as this is a forum with wide international membership. Our customer base is widely distributed across the world. 73, Eric elecraft.com _..._ > On Aug 15, 2018, at 7:07 PM, > wrote: > > Scott: > > Are you saying a retired colonel in the U.S. military does not have the > right to express his feelings? Or, are you saying that if someone does not > agree you with you find them offensive? Either way is narrow minded. > > I find not allowing people to have and express an opinion different than > mine to be refreshing and a door opener to interesting conversations, > retired colonels included. > > 73 > Marv > KG7V > > -Original Message- > From: elecraft-boun...@mailman.qth.net On > Behalf Of Scott Manthe > Sent: Wednesday, August 15, 2018 5:19 PM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] K3 > > Thank you, Doug! The fact that a retired colonel in the U.S. military made > that comment is offensive. > > 73, > Scott N9AA > > >> On 8/15/18 5:54 PM, Doug Person wrote: >> You do realize that Japan is a serious economic and military ally... >> and has been since the end of WWII. You're saying you won't buy them >> because - You Know - they're Japanese... >> >> KJ0F >> >> >>> On 8/15/2018 4:09 AM, John Harden, D.M.D. wrote: >>> I purchased my K3 in 2011 when I took a lightening strike to my Orion >>> I. After using it for 7 years I have really grown to like it. One >>> great feature is the ability to use two separate receive antennas >>> with Diversity Receive... No other transceiver has this feature.. >>> >>> Plus being retired military I DO NOT purchase RICE BOX gear... Only >>> American.. >>> >>> 73, >>> >>> John, W4NU >>> >>> (K4JAG 1959 to 1998) > > __ > 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 marvwhee...@nwlink.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 eric.swa...@elecraft.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
Re: [Elecraft] DX World Transceiver survey
Elecraft is now at 32%. I voted but non scientific studies are mostly for fun and not a representative answer with validity. 73, Gary KA1J K3 #202 & fully updated to K3s specs. K3s #10622 & fully updated. > Elecraft is currently in 4th place. You know what to do... > > https://dx-world.net/worldwide-transceiver-survey/ > __ > 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 g...@ka1j.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
Re: [Elecraft] DX World Transceiver Survey
Thread closed. Folks, this is drifting way OT. Eric elecraft.com _..._ > On Aug 15, 2018, at 4:24 PM, Dauer, Edward wrote: > > It may be proof that foreign agents can hack and manipulate any American > voting process. > > Should DOJ be brought in? > > Ted, KN1CBR > >-- > >Message: 19 >Date: Wed, 15 Aug 2018 13:53:36 -0400 >From: "Peter W2IRT" >To: "'Elecraft Reflector'" >Subject: Re: [Elecraft] DX World Transceiver survey >Message-ID: <001801d434c0$e4898550$ad9c8ff0$@net> >Content-Type: text/plain;charset="UTF-8" > >The very nature of this survey is heavily skewed. DX World is not a > website than Barry Baofeng, Nathan Netminder or Hammy Hambone are ever going > to visit. > > - pjd > > > > > __ > 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 eric.swa...@elecraft.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
Re: [Elecraft] Rights
Thread closed. Folks, this is clearly OT and outside of the area of permitted posting topics for the elecraft list. Please keep posts ham radio and elecraft related. Eric elecraft.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
Re: [Elecraft] [KPA1500] Auto start KPA1500-Remote in host mode
I am running "Pro" like that makes a difference. Only if the workstation is joined to an Active Directory Domain, and then through Domain Policy-- can you disable the Windows Updates on Win 10. All I can do is postpone it for an extended time. Eventually, it will take an update and reboot. Only realistic solution to stopping auto reboots is to bail out on Windows 10 and go back to Windows 7. I don't really want to block updates completely either. I'm in touch with the software dev and will certainly get the application square, without heroic measures with an autokey program. It's just a bug or unfinished functionality. Warren Merkel, KD4Z On 8/15/2018 11:54 PM, elecraft-requ...@mailman.qth.net wrote: Date: Wed, 15 Aug 2018 17:45:05 -0500 From: Mike Murray Only if you have the pro version. Microsoft is trying to protect us amateurs;-) Mike - W0AG __ 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 Efficiency
I would think these RF input versus RF output numbers are reasonable. Everyone's setup will vary for all bands. I haven't looked at the KPA-1500 Utility in a while, but "real" efficiency of the amplifier is a different calculation. Amp efficiency is Power Input versus Power Output, and per Elecraft that is somewhere around 50% or so. If you had the equipment to measurement the power input, it would be somewhere in the 3000W range I would assume with a 1500W output. That is why the fans are required and the ventilation of the unit is critical, as there is a lot of heat being dissipated to the space as was discussed in other posts. Bill, K8ZCT -- Sent from: http://elecraft.365791.n2.nabble.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
Re: [Elecraft] [KPA1500] Auto start KPA1500-Remote in host mode ?
Take a look at Autohotkey. It is a scripting language for Windows that can do things like simulate key presses and mouse clicks, and a whole bunch more. If you can write it in their scripting language and compile it to an executable, that can be run on startup. I use it to automate the interactions of multiple programs. I have an example script for checking the state of check boxes and sending mouse clicks to my Perseus SDR control panel here: https://sites.google.com/site/spectrumlabtesting/home/resetperseus-exe Maybe you can do something similar. If you can program, you can do it in their scripting language. If you mark your internet connection as a metered connection, Windows 10 will delay most updates. You can manually trigger the updates or change to unmetered to run them. I hope this helps. 73, Mark W7MLG On Wed, Aug 15, 2018, 11:44 AM Warren Merkel wrote: > I'm looking to get the KPA1500-Remote utility to survive these darn > Windows 10 forced reboots after Windows Update. I can get the KPA1500 > Remote utility to auto-start FB after a reboot. > > However, it doesn't remember it was in "Host Remote" mode and just comes > up waiting for mouse clicks that will never come -- since it's on an > unattended PC running RCForb. I'm using it in "Ethernet" mode, though > the KPA1500's USB cable is also connected to the same PC for RCForb. > > There doesn't seem to be any command line options yet, or at least > nothing is documented or listed from a /h, /help, or /? command line > parameter. > > Am I missing something in the setup dialogs? > > Other observations: > > When the "Start Hosting Remote" command button is clicked, I get the > warning dialog: "IP Address Appears not to be a Local IP or Invalid IP..." > > My IP addresses are sane as both the PC and the KPA1500 have valid > addresses in the 192.168.x.x address space. Could this warning dialog > be getting in the way of the auto-start of Hosting Remote mode. > > The process name shows up in task list as "KPA500-Remote", though I know > it's really the KPA1500 version of the app. > > Constructive suggestions welcomed. > > KPA1500 Remote version 1.0.14.0 > > Warren Merkel, KD4Z > > > __ 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
