Re: [Elecraft] KPA500 Transformer
The torque spec is called out in the manual. Why not use a torque wrench? Can we please not resurrect the KPA500 hum thread already beat to death multiple times years ago? Or does everyone need to chime in yet again? 55 inch-pounds. 73 Eric WD6DBM On Mon, Oct 19, 2020, 9:15 PM Bert wrote: > Toroidal transformers cause very little acoustic hum, unless the core > is not tightly wound or the copper wire windings are loose! > > If you have to tighten the mounting bolt with a torque wrench > to get the transformer quiet, something is wrong! > > Bert VE3NR > > > > > On 2020-10-19 19:59, Jim Spikes N4KH wrote: > > Looking for details from anyone who resolved issues with excessive > > transformer hum during transmit on a KPA-500. > > > > > > > > I have a hum mitigation application note sent from Elecraft tech support. > > But the procedure recommended is pretty involved - removing front/side > > panels, un-plugging connections, removing the transformer, changing > > positions of the rubber discs, and putting it back together. Possibly > more > > than once, depending on the results. > > > > > > > > There is a risk of breaking something, and I'm not sure its going to > solve > > the problem if I'm successful. This is a new out of the box KPA500 kit. > > > > > > > > If anybody has any lessons learned I would appreciate hearing them. > > > > > > > > Jim, N4KH > > > > __ > > 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 ve...@bell.net > > __ > 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 norrislawfi...@gmail.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] KPA500 Main Power - ON 24/7/365?
If you leave it "on," the power supply is energized. A surge on the line could fry the unit. It happened to me with a Yaesu Quadra. k4ia, Buck K3s# 11497 Honor Roll 8B DXCC EasyWayHamBooks.com On 10/20/2020 12:16 AM, Jack W9JH wrote: Is there any harm in leaving the KPA500 rear MAIN Power Switch ‘ON', 24/7/365? (not the front panel power button). I have done that with my KPA500 at the home station with no problem, but wondered about doing it at the remote site? I can operate the front panel “ON” button and “OPER/STBY” switch remotely so the amp is not running full-time, just the internal power supply. 73, Jack W9JH __ 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 radiok...@gmail.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] KPA500 Main Power - ON 24/7/365?
Is there any harm in leaving the KPA500 rear MAIN Power Switch ‘ON', 24/7/365? (not the front panel power button). I have done that with my KPA500 at the home station with no problem, but wondered about doing it at the remote site? I can operate the front panel “ON” button and “OPER/STBY” switch remotely so the amp is not running full-time, just the internal power supply. 73, Jack W9JH __ 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] KPA500 Transformer
Toroidal transformers cause very little acoustic hum, unless the core is not tightly wound or the copper wire windings are loose! If you have to tighten the mounting bolt with a torque wrench to get the transformer quiet, something is wrong! Bert VE3NR On 2020-10-19 19:59, Jim Spikes N4KH wrote: Looking for details from anyone who resolved issues with excessive transformer hum during transmit on a KPA-500. I have a hum mitigation application note sent from Elecraft tech support. But the procedure recommended is pretty involved - removing front/side panels, un-plugging connections, removing the transformer, changing positions of the rubber discs, and putting it back together. Possibly more than once, depending on the results. There is a risk of breaking something, and I'm not sure its going to solve the problem if I'm successful. This is a new out of the box KPA500 kit. If anybody has any lessons learned I would appreciate hearing them. Jim, N4KH __ 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 ve...@bell.net __ 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] KPA500 Transformer
Even the 'normal' hum was too much my tastes. My KPA500 is now on the floor, under the desk with a remote digital readout on the desk. John K7FD > On Oct 19, 2020, at 6:25 PM, Eric Norris wrote: > > When the KPA500 first came out, there were lots of complaints about hum. > This made it difficult for Elecraft Support to differentiate between normal > hum, which I can barely hear, to the obnoxiously loud hum of a misaligned > transformer. I finally called support so they could hear the hum of my > KPA500, which was in the obnoxious category. > > Take a breath, you can fix this. Tweaking the bolt torque, and slightly > moving the transformer, requires only removing the cover. If you don't own > and can't borrow a torque wrench, given your investment--buy one. A small, > inexpensive one will do the trick as the torque is quite low. > > 73 Eric WD6DBM > >> On Mon, Oct 19, 2020, 5:00 PM Jim Spikes N4KH wrote: >> >> Looking for details from anyone who resolved issues with excessive >> transformer hum during transmit on a KPA-500. >> >> >> >> I have a hum mitigation application note sent from Elecraft tech support. >> But the procedure recommended is pretty involved - removing front/side >> panels, un-plugging connections, removing the transformer, changing >> positions of the rubber discs, and putting it back together. Possibly more >> than once, depending on the results. >> >> >> >> There is a risk of breaking something, and I'm not sure its going to solve >> the problem if I'm successful. This is a new out of the box KPA500 kit. >> >> >> >> If anybody has any lessons learned I would appreciate hearing them. >> >> >> >> Jim, N4KH >> >> __ >> 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 norrislawfi...@gmail.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 macymonk...@charter.net __ 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] KPA500 Transformer
When the KPA500 first came out, there were lots of complaints about hum. This made it difficult for Elecraft Support to differentiate between normal hum, which I can barely hear, to the obnoxiously loud hum of a misaligned transformer. I finally called support so they could hear the hum of my KPA500, which was in the obnoxious category. Take a breath, you can fix this. Tweaking the bolt torque, and slightly moving the transformer, requires only removing the cover. If you don't own and can't borrow a torque wrench, given your investment--buy one. A small, inexpensive one will do the trick as the torque is quite low. 73 Eric WD6DBM On Mon, Oct 19, 2020, 5:00 PM Jim Spikes N4KH wrote: > Looking for details from anyone who resolved issues with excessive > transformer hum during transmit on a KPA-500. > > > > I have a hum mitigation application note sent from Elecraft tech support. > But the procedure recommended is pretty involved - removing front/side > panels, un-plugging connections, removing the transformer, changing > positions of the rubber discs, and putting it back together. Possibly more > than once, depending on the results. > > > > There is a risk of breaking something, and I'm not sure its going to solve > the problem if I'm successful. This is a new out of the box KPA500 kit. > > > > If anybody has any lessons learned I would appreciate hearing them. > > > > Jim, N4KH > > __ > 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 norrislawfi...@gmail.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] KPA500 Transformer
Hi Jim, I had a bad hum from my KPA500 kit, an early model. Elecraft sent me a new center bolt that was only threaded on the end--the original bolt had threads all along the shaft. Also an additional pad. Assuming you assembled it all correctly, try these two things: If you have a torque wrench, tighten the bolt to the exact spec. If you don't have one, try slightly tightening or even loosening the bolt. Second, make sure the transformer is exactly centered on the bolt and not touching any of the sheet metal, including the side panel. Use a strong flashlight to check it with the top removed. UNPLUG THE AMP FIRST! Mine has been hum-free for years, after the tweaking. 73 Eric WD6DBM On Mon, Oct 19, 2020, 5:00 PM Jim Spikes N4KH wrote: > Looking for details from anyone who resolved issues with excessive > transformer hum during transmit on a KPA-500. > > > > I have a hum mitigation application note sent from Elecraft tech support. > But the procedure recommended is pretty involved - removing front/side > panels, un-plugging connections, removing the transformer, changing > positions of the rubber discs, and putting it back together. Possibly more > than once, depending on the results. > > > > There is a risk of breaking something, and I'm not sure its going to solve > the problem if I'm successful. This is a new out of the box KPA500 kit. > > > > If anybody has any lessons learned I would appreciate hearing them. > > > > Jim, N4KH > > __ > 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 norrislawfi...@gmail.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] PA500 Transformer
"If anybody has any lessons learned I would appreciate hearing them." I built a KPA500 kit and I too was bothered by the transformer hum. I learned that Elecraft has used several different transformer suppliers and that transformer sizes vary. This means the clearances between the transformer and the case may be very different for the supplied transformer than as shown in the manual. I carefully shimmed the transformer before tightening the retaining nut so there was no case contact. I also learned that hum level is directly related to PA current. If the PA load is mismatched the efficiency goes down, PA current is higher for same power output, and hum level is higher. I ignore the 1.5:1 match is ok recommendations and tune for better than 1.2:1. Perhaps the most important thing I learned is that one can get used to almost anything. The hum and clicks that drove me crazy in the first few months of ownership are now ignored. I found something else to worry about. Andy, k3wyc __ 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] KPA500 Transformer
I don't see the problem. I presume you bought a kit to assemble it yourself. You simply reverse part of the assembly procedure, then re-assemble it. I've assembled several KPA500s and I'd bet that you didn't quite get it right first time. There's no shame in that. This is a risk you take with self-assembly. ISTR there's a torque wrench setting for tightening. Did you use one? Have confidence. Take it apart, do as they say and enjoy feeling smug that you fixed it yourself. :-) Lessons learned? Yeah, take your time, follow instructions to the letter. Don't do anything if you're tired. Plenty of space. Plenty of light. The right tools and a suitable container for parts. 73, Alan. G4GNX -- Original Message -- From: "Jim Spikes N4KH" To: Elecraft@mailman.qth.net Sent: 20/10/2020 00:59:06 Subject: [Elecraft] KPA500 Transformer Looking for details from anyone who resolved issues with excessive transformer hum during transmit on a KPA-500. I have a hum mitigation application note sent from Elecraft tech support. But the procedure recommended is pretty involved - removing front/side panels, un-plugging connections, removing the transformer, changing positions of the rubber discs, and putting it back together. Possibly more than once, depending on the results. There is a risk of breaking something, and I'm not sure its going to solve the problem if I'm successful. This is a new out of the box KPA500 kit. If anybody has any lessons learned I would appreciate hearing them. Jim, N4KH __ 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] KPA500 Transformer
Looking for details from anyone who resolved issues with excessive transformer hum during transmit on a KPA-500. I have a hum mitigation application note sent from Elecraft tech support. But the procedure recommended is pretty involved - removing front/side panels, un-plugging connections, removing the transformer, changing positions of the rubber discs, and putting it back together. Possibly more than once, depending on the results. There is a risk of breaking something, and I'm not sure its going to solve the problem if I'm successful. This is a new out of the box KPA500 kit. If anybody has any lessons learned I would appreciate hearing them. Jim, N4KH __ 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] K2 Firmware & Software
A Google search for Elecraft K2 Software gets a lot of hits. I only listed the ones from the Elecraft Site https://elecraft.com/pages/k3-k3s-kx3-and-k2-control-setup-programs https://elecraft.com/pages/k2-remote-k2-voice-program-downloads-and-instructions https://elecraft.com/pages/logging-programs-that-support-k3-kx3-k2 73 Howard Stephenson K6IA __ 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] K2 Firmware & Software
Ray, I don't know about any software, but the latest firmware is available - the most recent is MCU 2.04, IOC 1.09 They must go together - order as FWK2MCIO. If you have trouble finding it on the website, just email sa...@elecraft.com to order. To find your currently installed K2 firmware level, hold any button while powering the K2 on, the firmware level will be briefly displayed. 73, Don W3FPR On 10/19/2020 5:25 PM, Ray Spreadbury via Elecraft wrote: I can't find the link to the last versions of firmware & software for the K2. I know it was some years ago, but thought it would still be available on the Elecraft site. __ 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] K2 Firmware & Software
I can't find the link to the last versions of firmware & software for the K2. I know it was some years ago, but thought it would still be available on the Elecraft site. Does anybody have a link or can tell me the Version numbers? 73 Ray G3XLG __ 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] k2 cw filter setting
__ 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] P3 Sold
Good day, the P3 that I offered for sale yesterday has been sold. 73, Doug N7QS __ 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 band data query
Dennis, The K3's BCD outputs are defined by band, not frequency. You need something that tracks QRG, but the following may be serious overkill for your needs... If you use the general purpose logger DXLabs, or the contest logger N1MM, consider a freeware Band Decoder called FreqEZ. The program receives frequency info from those loggers and allows you to to define 255 band segments that control any combination of 16 remote relay lines. The software is free, but the hardware components are not. The FreqEZ website describes a DIY solution or an Assembled and Tested solution. (DISCLAIMER: I wrote the free software, but I also sell the Assembled and Tested hardware) www.freqez.info If you only need a few outputs, you could probably cobble together something that uses the free software but is simpler and cheaper. Contact me if you're interested. -larry (K8UT) -- Original Message -- From: "Dennis Ashworth" To: Elecraft@mailman.qth.net Sent: 2020-10-18 2:28:42 PM Subject: [Elecraft] K3 band data query I operate a vertical antenna for 80 & 160M where the bandwidth is such that I need to switch in reactance between the phone and CW portions of each band. I currently do this manually, but am installing vacuum relays for switching remotely. Is there a way the K3, through the data port or whatever, can send a signal when migrating between traditional (or operator defined) phone and CW portions of the band? Antenna matched points on 160 are at 1825 and 1855; 80M are 3520 and 3800. I had considered sensing the K3 mode, but that’s not an acceptable solution. The 160M CW contests can often extend into the traditional phone area and FT8/WSPR often use USB mode in the CW portion. Thoughts? Dennis, K7FL Las Vegas, NV __ 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 k...@charter.net __ 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] FS: PR6 Preamp
I have a PR6 6m preamp surplus to my needs. With the two BNC-BNC connectors. $60 includes shipping within CONUS. 73, Eric W3DQ __ 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] Elecraft lovers Zoom
The Elecraft lovers Zoom meets on Sundays at 2000 UTC. We discuss Elecraft stuff of course (K4!!) and lots of other things of interest (computers, propagation, sailing, fires, weather, etc., etc., etc.) Some recent attendees: K8NU, WB9JNZ, WM6P, KB9AVO, NC0JW, W4DML, WY3T, NS7P, N8SBE, K1NW, AE6JV, N4NRW. No QRM, QSB, and everyone is 40 over 9. If you’re interested, shoot me an email and I’ll send the link. 73, Carl, K8NU __ 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] K3S Filter Problems
Thanks to all who assisted me. I opened the rig and it turned out the filter offsets on the top panel label had the incorrect offsets. Taking a look at the filters I found the real offsets, entered them in the Configuration and that was the solution. Vy 73 de Bob DJ0RD/WU5T __ 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] FS: K3S/10 - Factory built (accessories added)
I am selling this K3S/10 which I used to drive a 2m transverter during my EME adventure. Here are the particulars: K3S/10 - F s/n 118xx K144XV-F K144RFLK-F K3EXREF-F KFL3A 2.8 2.7 swap Accessories included: Pro Audio Engineering power supply N6TV Y box This radio was put in service in April 2019 and is now surplus to my needs. Purchase price was a bit over $3,000, I am asking $2,200 shipped/insured in USA. I should have included the accessories with the first email. Jim Spears N1NK Tiverton, RI __ 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] FS: K3S/10 - Factory built
I am selling this K3S/10 which I used to drive a 2m transverter during my EME adventure. Here are the particulars: K3S/10 - F s/n 118xx K144XV-F K144RFLK-F K3EXREF-F KFL3A 2.8 2.7 swap This radio was put in service in April 2019 and is now surplus to my needs. Purchase price was a bit over $3,000, I am asking $2,200 shipped/insured in USA. Jim Spears N1NK Tiverton, RI __ 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 / K3 Mystery
Ben, The process I use is to first clear all the tuner settings on the band I'm using. I go to STBY and hit ATU TUNE. Low power is applied to start the search. When I first got the amp I did this when in OPER, but even with low drive power I kept getting faults due to initially high SWR. Recently during a trace working with Dick he noticed intervals of very high drive power... up to 60w, which means the K3 ramps up power output at times. It's complex. Jim W6YA __ 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 / K3 Mystery
Jim, What were the actions taken before you performed the re-training. Did you CLEAR all of the ‘bins’? Ben W4SC. Sent from Mail for Windows 10 __ 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] K4 Headphones Q
I did an initial test of this headset yesterday and found that the audio quality was good, but there was some background hiss. It could have been because the headset was not properly powered, since I have it plugged in to my mixer with phantom to 2.5v jerry rigged. I have a proper adapter coming tomorrow, and will do some proper analytics and comparison to other mics. ED / W2RF -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of Jim Miller Sent: Sunday, October 18, 2020 10:11 AM To: Jim McDonald Cc: Elecraft Reflector (elecraft@mailman.qth.net) Subject: Re: [Elecraft] K4 Headphones Q I took a chance on the QC-35 while on sale and so far I'm pleased. I also bought an accessory boom mike that plugs into the connector on the QC-35 and so far that has worked well in OTA tests. My QC-15 no longer attenuates my KPA1500 fans beyond just covering my ears with the cups so something has gone wrong with those. The QC-35 are very effective. I use a ModMic with the QC-15 which works very well and may substitute for the accessory mike if that doesn't pan out. The boom mike came with a much more rugged cable than the one which came with the QC-35. I was concerned about the mike moving but with the shirt clip I find it stays in place to my satisfaction. I don't know if it will reject amp fan noise however. I'll have to try that today. The fan never gets above speed 2 on SSB so not much of a challenge. The boom mike came with a TRRS to dual TRS splitter which worked well on the back on my K3s. The QC35 claims 40hrs of battery life when wired which is far more time than I'll ever put in any contest so that isn't a concern. When unplugged it becomes a Bluetooth set which I've paired with both my phone and PC. That means that I no longer need a PC headset cluttering up my desk.for when I want to do MorseRunner or listen to a Youtube session. 73 and stay safe! jim ab3cv __ 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 e...@qrv.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/GainLow/Input Pwr
Frank, Check the idling current: it should be 2 amps (keyed with no drive). Gud luck, Roy K6XK My KPA1500 just started needing a lot more drive (2X) to get 'normal' output. I normally need 25-30 watts drive to get ~1k out. Now I need about 60W. I get two kinds of alarms, depending on how I test the situation, either a red "Gain Low' or a yellow 'Input Pwr'. If I drive with a steady 10w, I get a 'Gain Low'. On cw, Just before cutting out, I can drive the amp with ~65w, get ~600w out, then get 'InputPwr" followed by Gain Low' and the amp cuts out. Time to go back to the factory? Tnx, Frank W2YK _ __ 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
