[Elecraft] Which meter to trust?
Putting my brand new KPA-500 through its paces and I’m noticing a significant difference between the peak power displayed on the amp, and the peak power displayed on a Telepost LP-700 station monitor. With the amp peaking at 500 watts, the LP-700 will often show peaks in the 600+ watt range. The trapezoidal display on the LP-700 does not show any non-linearity during such operations. Is this then simply a difference in how the power is metered? As always, your collective wisdom is both appreciated and valued. Paul, W2PIR Dare Mighty Things. -Jet Propulsion Laboratory __ 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] QRO - KPA500 Failure
I run my KPA500 output just below the level I feel I can get away with...without lighting up the neighborhood. About 350 watts :) John K7FD > On Feb 6, 2020, at 2:06 PM, Bob McGraw K4TAX wrote: > > I've never seen much if any advantage in running a linear below its rated > output. I know the regulation state never run more power than needed for > adequate communications or terms like that.The difference between 500 > watts and 100 watts is 6.9 dB or about 1 S unit. > > In fact, most all of the time, running at less than rated output is less > efficient. It saves nothing. Same for tube amps where I hear hams say > they are running at reduced power to "save the tubes". Nope, not the case. > > (RF output / DC input) * 100 = % efficiency DC input watts = DC > volts x DC amps > > Do the math and you'll see what I mean. > > A quick run of the numbers with my KPA500 into a dummy load. Output measured > with a Bird 43. DC values taken from the KPA500 display > > 450 W out, 819 W input, 64 volts @ 12.8 amps for 55% efficiency Drive pwr = > 16.5W 14.3 dB gain 819 - 450 = 369 watts = heating factor = 0.88 > > 210 W out, 576 W input, 67 volts @ 8.6 amps for 37% efficiency Drive pwr = > 7.0 W 14.7 dB gain 576 - 210 = 366 watts = heating factor = 1.74 > > 100 W out, 393 W input, 69 volts @ 5.7 amps for 25% efficiency Drive pwr > = 3.2 W 14.9 dB gain 393 - 100 = 293 watts = heating factor = 2.93 > > 73 > > Bob, K4TAX > > >> On 2/6/2020 3:07 PM, Rick Bates, NK7I wrote: >> Running low output power from it, is far less efficient than pushing it hard >> (compare wattages consumed to RF watts output delivered at different output >> levels); which may have stressed the finals. Ideally you run the previous >> stages at low-moderate power for lower IMD, then punch it up with the amp. > > __ > 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
[Elecraft] KPA500 Input power vs. Output power
Hi, I got bored today, and graphed the input power vs. the output power of my KPA500 across 160 through 10 meters. I put the results on my web site at: https://www.nk7z.net/kpa500-input-vs-output-power/ -- 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst. Director, NW Division, Technical Resources __ 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] problem downloading new (current) firmware from kx3 FTP site.
Probably because the folder you’re choosing for firmware files cannot be written to without admin privileges. Most folders under Program Files require admin permission for write. It’s intended for programs, not user data. Click the default button on the KX3 Utility Firmware tab, and the utility should then be able to write into that folder. Or choose a different folder under your user folder... 73 de Dick, K6KR > On Jan 28, 2020, at 12:06, Bill Steffey wrote: > > I am doing something wrong , I cannot seem to download current FW with kx3 > utility... > > What am I doing wrong .. > > > tnx > > > bill > > 14:58:39 Opening connection to ftp.elecraft.com > 14:58:39 Copying files to C:\Program Files (x86)\Elecraft\KX3 Utility > 14:58:39 FtpGetFile completed with error 0x0005: Access is denied. > 14:58:39 Click "Close" to close this window > 14:58:41 Ready > 14:58:41 Firmware folder does not contain required KX3 firmware files > Click "Copy new files from Elecraft" > or navigate to a folder containing KX3 firmware files > 14:58:41 Serial Port is closed > 14:58:41 Attempting to contact KX3 on port COM4 at 38400 bit/s > 14:58:42 KX3 MCU revision 02.90. RS-232 speed 38400 bit/s > > __ > 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 d...@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
[Elecraft] [KPA1500] Power supply filter tip
I thought I'd mention a tip I've done to filter out fine dust from being pulled into the KPA1500 power supply. My unit runs 24/7 and I was surprised how rapidly the fan grid on top of the power supply gathered a circular collection of dust, even though the floor is tiled. I picked up a package of washable foam filter material at the home store. It is normally used as a replacement air conditioner filter. Here are a few shots. Looks like it's time to wash it again... https://i.postimg.cc/h4kzMjxf/KPA1500-filter1.jpg https://i.postimg.cc/4xMrHrjk/KPA1500-filter2.jpg 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
Re: [Elecraft] QRO - KPA500 Failure
"Basically, based on Bob's measurements, the power dissipated is fairly independent of drive level. So, running at reduced power really isn't stressing anything any more that full output." I have done quite extensive testing of my KPA500 and provided links to my results. My KPA500 PA dissipation is strongly dependent on the PA load but, for any given load, the peak dissipation is at out half power output. 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] QRO - KPA500 Failure
Basically, based on Bob's measurements, the power dissipated is fairly independent of drive level. So, running at reduced power really isn't stressing anything any more that full output. (Unlike an "ideal" class B amplifier.) 73, Scott K9MA On 2/6/2020 16:06, Bob McGraw K4TAX wrote: I've never seen much if any advantage in running a linear below its rated output. I know the regulation state never run more power than needed for adequate communications or terms like that. The difference between 500 watts and 100 watts is 6.9 dB or about 1 S unit. In fact, most all of the time, running at less than rated output is less efficient. It saves nothing. Same for tube amps where I hear hams say they are running at reduced power to "save the tubes". Nope, not the case. (RF output / DC input) * 100 = % efficiency DC input watts = DC volts x DC amps Do the math and you'll see what I mean. A quick run of the numbers with my KPA500 into a dummy load. Output measured with a Bird 43. DC values taken from the KPA500 display 450 W out, 819 W input, 64 volts @ 12.8 amps for 55% efficiency Drive pwr = 16.5W 14.3 dB gain 819 - 450 = 369 watts = heating factor = 0.88 210 W out, 576 W input, 67 volts @ 8.6 amps for 37% efficiency Drive pwr = 7.0 W 14.7 dB gain 576 - 210 = 366 watts = heating factor = 1.74 100 W out, 393 W input, 69 volts @ 5.7 amps for 25% efficiency Drive pwr = 3.2 W 14.9 dB gain 393 - 100 = 293 watts = heating factor = 2.93 73 Bob, K4TAX On 2/6/2020 3:07 PM, Rick Bates, NK7I wrote: Running low output power from it, is far less efficient than pushing it hard (compare wattages consumed to RF watts output delivered at different output levels); which may have stressed the finals. Ideally you run the previous stages at low-moderate power for lower IMD, then punch it up with the amp. __ 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...@sdellington.us -- Scott K9MA k...@sdellington.us __ 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] Off topic source of vacuum relay
On 2/6/2020 3:04 PM, Doug Turnbull wrote: Dear Oms and YLs, Forgive me for being well off topic. Can any of you direct me to a source for the following new SPDT vacuum relay: Jennings RJ1A-26S Gigavac GH1 with 26V coil Kilovac HC-1 26V coil Siemens VR-311ered to augie.han...@comcast.net Try Max-Gain Systems (https://mgs4u.com/). Alan offers both new and used (surplus or pulls, tested) vacuum relays and other components at reasonable prices. Gus Hansen, KB0YH __ 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] QRO - KPA500 Failure
The advantage I have is that it doesn't set off my fire alarm. On Thu, 6 Feb 2020, Bob McGraw K4TAX wrote: I've never seen much if any advantage in running a linear below its rated output. I know the regulation state never run more power than needed for adequate communications or terms like that.The difference between 500 watts and 100 watts is 6.9 dB or about 1 S unit. In fact, most all of the time, running at less than rated output is less efficient. It saves nothing. Same for tube amps where I hear hams say they are running at reduced power to "save the tubes". Nope, not the case. (RF output / DC input) * 100 = % efficiency DC input watts = DC volts x DC amps Do the math and you'll see what I mean. A quick run of the numbers with my KPA500 into a dummy load. Output measured with a Bird 43. DC values taken from the KPA500 display 450 W out, 819 W input, 64 volts @ 12.8 amps for 55% efficiency Drive pwr = 16.5W 14.3 dB gain 819 - 450 = 369 watts = heating factor = 0.88 210 W out, 576 W input, 67 volts @ 8.6 amps for 37% efficiency Drive pwr = 7.0 W 14.7 dB gain 576 - 210 = 366 watts = heating factor = 1.74 100 W out, 393 W input, 69 volts @ 5.7 amps for 25% efficiency Drive pwr = 3.2 W 14.9 dB gain 393 - 100 = 293 watts = heating factor = 2.93 73 Bob, K4TAX On 2/6/2020 3:07 PM, Rick Bates, NK7I wrote: Running low output power from it, is far less efficient than pushing it hard (compare wattages consumed to RF watts output delivered at different output levels); which may have stressed the finals. Ideally you run the previous stages at low-moderate power for lower IMD, then punch it up with the amp. __ 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 ht...@twofifty.com -- Hisashi T Fujinaka - ht...@twofifty.com BSEE + BSChem + BAEnglish + MSCS + $2.50 = coffee __ 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] QRO - KPA500 Failure
When I blew the final on my KPA500 Elecraft diagnosed the problem. I had to make a few meter readings and they figured out the problem. They gave me the option of removing the transformer for shipping (most of the amp weight). They gave me instructions to remove and reassemble when it returned. Saved a lot on shipping. Good luck 73 Joe K2UF __ 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] QRO - KPA500 Failure
As a follow up to my previous message I measured PA voltage and current for OPER mode not keyed and OPER mode keyed with no RF drive input. PAI not keyed .0, keyed .2 PAV not keyed 80.9, keyed 77.8 Hi reflected power fault can't happen with no drive so won't influence the results. 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] QRO - KPA500 Failure
I've never seen much if any advantage in running a linear below its rated output. I know the regulation state never run more power than needed for adequate communications or terms like that. The difference between 500 watts and 100 watts is 6.9 dB or about 1 S unit. In fact, most all of the time, running at less than rated output is less efficient. It saves nothing. Same for tube amps where I hear hams say they are running at reduced power to "save the tubes". Nope, not the case. (RF output / DC input) * 100 = % efficiency DC input watts = DC volts x DC amps Do the math and you'll see what I mean. A quick run of the numbers with my KPA500 into a dummy load. Output measured with a Bird 43. DC values taken from the KPA500 display 450 W out, 819 W input, 64 volts @ 12.8 amps for 55% efficiency Drive pwr = 16.5W 14.3 dB gain 819 - 450 = 369 watts = heating factor = 0.88 210 W out, 576 W input, 67 volts @ 8.6 amps for 37% efficiency Drive pwr = 7.0 W 14.7 dB gain 576 - 210 = 366 watts = heating factor = 1.74 100 W out, 393 W input, 69 volts @ 5.7 amps for 25% efficiency Drive pwr = 3.2 W 14.9 dB gain 393 - 100 = 293 watts = heating factor = 2.93 73 Bob, K4TAX On 2/6/2020 3:07 PM, Rick Bates, NK7I wrote: Running low output power from it, is far less efficient than pushing it hard (compare wattages consumed to RF watts output delivered at different output levels); which may have stressed the finals. Ideally you run the previous stages at low-moderate power for lower IMD, then punch it up with the amp. __ 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] Off topic source of vacuum relay
Dear Oms and YLs, Forgive me for being well off topic. Can any of you direct me to a source for the following new SPDT vacuum relay: Jennings RJ1A-26S Gigavac GH1 with 26V coil Kilovac HC-1 26V coil Siemens VR-311 Thank you for your forbearance. I would suggest answers off the list and direct to turnb...@net1.ie. I have a KPA1500 but also have a Acom 2000A and need a new antenna relay. Again thanks. 73 Doug EI2CN -Original Message- From: elecraft-boun...@mailman.qth.net On Behalf Of Hisashi T Fujinaka Sent: Thursday 6 February 2020 21:28 To: elecraft@mailman.qth.net Subject: Re: [Elecraft] QRO - KPA500 Failure I'm not sure who asked the question first, but check your email from Elecraft support about shipping. I was told Elecraft self-insures, so my shipping of my KPA1500 amp from Portland, OR to the mothership was around $20. On Thu, 6 Feb 2020, Rick Bates, NK7I wrote: > While also not cheap in shipping and insurance (ask me how I know?) > that is often the better choice. > > Rick, NK7I -- Hisashi T Fujinaka - ht...@twofifty.com BSEE + BSChem + BAEnglish + MSCS + $2.50 = coffee __ 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 turnb...@net1.ie __ 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] QRO - KPA500 Failure
"On key down (input of 15W) the asterisk briefly displays, then display changes to 18.1, back to HV display on key up." Are you saying the "HV" text in the display goes away or that it reads HV 18.1? Normally the HV display continues to read the PA supply voltage regardless of whether the amp is keyed or not. It would normally just change from approx 80 V to approx 60 V when keyed. At face value the results seem to indicate a high voltage supply failure or a fault in the PA that is sucking a very high current. What is the PA current during the brief period the KPA500 remains keyed? What are PA voltage and current when keyed if the 60 V line is disconnected from the PA module? Of course the safe plan would be to send it back but those are some of the test I would try if it were mine. 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] QRO - KPA500 Failure
Elecraft self-insures on outbound shipments (i.e., shipments from Elecraft to customer). That means they accept the responsibility of carrier loss or damage because their history of loss/damage has been low. The fact that they self-insure doesn't cover shipments to them unless the company is paying for the shipping, as is the case with a warranty return, I believe. Their shipping instructions for repair returns out of warranty recommend the customer insure the shipment. I received about a 25% discount from UPS when I shipped my KPA1500 a couple of months ago due to my membership in a professional society. You might check for similar discounts if you have any similar memberships. Jim N7US On Thu, Feb 6, 2020, 3:28 PM Hisashi T Fujinaka wrote: > I'm not sure who asked the question first, but check your email from > Elecraft support about shipping. I was told Elecraft self-insures, so my > shipping of my KPA1500 amp from Portland, OR to the mothership was > around $20. > > On Thu, 6 Feb 2020, Rick Bates, NK7I wrote: > > > While also not cheap in shipping and insurance (ask me how I know?) that > > is often the better choice. > > > > Rick, NK7I > > -- > Hisashi T Fujinaka - ht...@twofifty.com > BSEE + BSChem + BAEnglish + MSCS + $2.50 = coffee > > __ 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] QRO - KPA500 Failure
They self-insure OUTbound from Elecraft; it falls on the shipper to insure, not the recipient. I had to send in the RF deck (only) of the KPA1500 for factory upgrades and I asked for Elecraft to cover shipping. I waited a few days. An hour after I got back from shipping it UPS from Idaho (the insurance was a killer, total bill ~$180), they approved paying for it. DOH! Ask, then be more patient than me. The worst answer is 'no' and that only costs you time to find out. Rick NK7I On 2/6/2020 1:28 PM, Hisashi T Fujinaka wrote: I'm not sure who asked the question first, but check your email from Elecraft support about shipping. I was told Elecraft self-insures, so my shipping of my KPA1500 amp from Portland, OR to the mothership was around $20. On Thu, 6 Feb 2020, Rick Bates, NK7I wrote: While also not cheap in shipping and insurance (ask me how I know?) that is often the better choice. Rick, NK7I __ 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] QRO - KPA500 Failure
I'm not sure who asked the question first, but check your email from Elecraft support about shipping. I was told Elecraft self-insures, so my shipping of my KPA1500 amp from Portland, OR to the mothership was around $20. On Thu, 6 Feb 2020, Rick Bates, NK7I wrote: While also not cheap in shipping and insurance (ask me how I know?) that is often the better choice. Rick, NK7I -- Hisashi T Fujinaka - ht...@twofifty.com BSEE + BSChem + BAEnglish + MSCS + $2.50 = coffee __ 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] QRO - KPA500 Failure
Hi Rick, I like your call sign! :) 73, and thanks, Dave (NK7Z) https://www.nk7z.net ARRL Volunteer Examiner ARRL Technical Specialist ARRL Asst. Director, NW Division, Technical Resources On 2/6/20 1:07 PM, Rick Bates, NK7I wrote: Since the SWR is still nominal into the amp (as shown on your radio), it's not likely the tuned input circuits (which is confirmed from no output on all bands). This points to the high power module. Running low output power from it, is far less efficient than pushing it hard (compare wattages consumed to RF watts output delivered at different output levels); which may have stressed the finals. Ideally you run the previous stages at low-moderate power for lower IMD, then punch it up with the amp. The "HIGH SWR" fault you saw is then very likely the final signing QRT SK. You can confirm that with Elecraft wizards. That module isn't hard to swap out, but it would be best (slightly more costly) for the entire amp to visit it's parents, so that other updates that may not have been done, can be done. Many of them, really matter. While also not cheap in shipping and insurance (ask me how I know?) that is often the better choice. Rick, NK7I On 2/6/2020 12:54 PM, Michael Walker wrote: Amps making noises like that usually mean you have to take the covers off. They are easy enough to repair if you are so inclined. If not, then you will need to contact Elecraft support and odds are you will have to send it home for a Spa day. Mike va3mw On Thu, Feb 6, 2020 at 3:35 PM Jim Brown wrote: On 2/6/2020 12:15 PM, Jim Mullen wrote: Any pointers of where to start looking? 1) What SWR does the rig see with the amp off? 2) Make notes of any error messages given by the KPA500 display. 3) Call Elecraft Support 73, Jim K9YC __ 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 va...@portcredit.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 rick.n...@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 d...@nk7z.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] QRO - KPA500 Failure
Since the SWR is still nominal into the amp (as shown on your radio), it's not likely the tuned input circuits (which is confirmed from no output on all bands). This points to the high power module. Running low output power from it, is far less efficient than pushing it hard (compare wattages consumed to RF watts output delivered at different output levels); which may have stressed the finals. Ideally you run the previous stages at low-moderate power for lower IMD, then punch it up with the amp. The "HIGH SWR" fault you saw is then very likely the final signing QRT SK. You can confirm that with Elecraft wizards. That module isn't hard to swap out, but it would be best (slightly more costly) for the entire amp to visit it's parents, so that other updates that may not have been done, can be done. Many of them, really matter. While also not cheap in shipping and insurance (ask me how I know?) that is often the better choice. Rick, NK7I On 2/6/2020 12:54 PM, Michael Walker wrote: Amps making noises like that usually mean you have to take the covers off. They are easy enough to repair if you are so inclined. If not, then you will need to contact Elecraft support and odds are you will have to send it home for a Spa day. Mike va3mw On Thu, Feb 6, 2020 at 3:35 PM Jim Brown wrote: On 2/6/2020 12:15 PM, Jim Mullen wrote: Any pointers of where to start looking? 1) What SWR does the rig see with the amp off? 2) Make notes of any error messages given by the KPA500 display. 3) Call Elecraft Support 73, Jim K9YC __ 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 va...@portcredit.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 rick.n...@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] QRO - KPA500 Failure
Amps making noises like that usually mean you have to take the covers off. They are easy enough to repair if you are so inclined. If not, then you will need to contact Elecraft support and odds are you will have to send it home for a Spa day. Mike va3mw On Thu, Feb 6, 2020 at 3:35 PM Jim Brown wrote: > On 2/6/2020 12:15 PM, Jim Mullen wrote: > > Any pointers of where to start looking? > > 1) What SWR does the rig see with the amp off? > 2) Make notes of any error messages given by the KPA500 display. > 3) Call Elecraft Support > > 73, Jim K9YC > __ > 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 va...@portcredit.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] QRO - KPA500 Failure
On 2/6/2020 12:15 PM, Jim Mullen wrote: Any pointers of where to start looking? 1) What SWR does the rig see with the amp off? 2) Make notes of any error messages given by the KPA500 display. 3) Call Elecraft Support 73, Jim K9YC __ 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 60 Meter Channels?
Ken, Download the K2 manual (unless you have a recent printed copy) and look at Channel Hopping on page 103. 73, Don W3FPR On 2/6/2020 3:08 PM, Ken Jones wrote: Hi all, Haven’t used the 60 meter band for over a year in my 2003 K2 and when I went to the band this weekend, it just tunes, no VFO stepping thru the channels anymore? Looked at the 60M board manual but no luck getting it back to normal. Can someone point me in the right direction to get the channelization back? That D19 menu diode option is on. Thanks for any help! Ken, W2GIW __ 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 donw...@embarqmail.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] QRO - KPA500 Failure
Was running about 150W on 18 MHz this afternoon. My KPA 500 made a loud pop. No more output. Any pointers of where to start looking? *Details:* KPA500 (use with KAT500 and Icom 7610) Antenna on this band is a SteppIR Amp has been running FB KPA Utility 1.13.7.16 240V supply A single loud pop was heard. Mode remained in OPER No fault light displayed, nor can I find one in the Fault Table *After the failure:* *In STBY:* Radio and antennas work fine. SWR shown to exciter is low, as expected. Exciter power is displayed on KPA500 power meter. HV = 78.2 Works correctly on all bands *In OPER:* HV = 78.2 key up On key down (input of 15W) the asterisk briefly displays, then display changes to 18.1, back to HV display on key up. Zero output, SWR shown to exciter is very high (over 3 to 1) No power shown on output meter. Fails *on all bands* with high SWR to the exciter. No fault indication. *Other data:* Here's the last three entries from the fault table: 00 PWR ON -- 0007 Power was turned on 0039 09 REFL HI 80 00F0 Excessive reflected power (high SWR) 00 PWR ON -- Power was turned on . Apparently only faults get logged, subsequent power cycles have not changed the table. I power cycled the amp, including removing the mains power. - no change. I reloaded the last configuration - no change. I removed the cover and looked for any visible damage or bad odors. Nothing stands out. Amp is about 4 years old and was a kit model. Before I start to disassemble if anyone can offer a likely culprit I'm all ears. Thanks, Jim/KK1W __ 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 60 Meter Channels?
Hi all, Haven’t used the 60 meter band for over a year in my 2003 K2 and when I went to the band this weekend, it just tunes, no VFO stepping thru the channels anymore? Looked at the 60M board manual but no luck getting it back to normal. Can someone point me in the right direction to get the channelization back? That D19 menu diode option is on. Thanks for any help! Ken, W2GIW __ 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] VFO B dead
Thank you Alex, good to know the raw encoder PN.73,Gary K9GS Original message From: Alex Malyava Date: 2/6/20 12:02 PM (GMT-06:00) To: K9MA Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] VFO B dead The encoder itself, if you want to re-solder it, isBourns Inc.ENS1D-B28-L00100Lcost is about $58 in DigiKey and $45 in MouserOn Thu, Feb 6, 2020 at 11:57 AM K9MA wrote:> On 2/6/2020 10:03, Gary K9GS wrote:> > Hi All,I finally found some time this morning to take apart my> K3.Removing the front panel was relatively easy. I swapped the VFO A and> VFO B encoders and I did have a defective VFO B encoder .I've ordered a> replacement encoder from Elecraft, $60 plus shipping. 73,Gary K9GS>> I haven't had any failures, but a while ago I ordered some spare> encoders and pots for my K3, just in case they aren't available in the> future.>> 73,>> Scott K9MA>> --> Scott K9MA>> k...@sdellington.us>> __> 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 alex.k2bb@gmail.com__Elecraft mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:elecr...@mailman.qth.netThis list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.htmlMessage delivered to k...@gjschwartz.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] VFO B dead
The encoder itself, if you want to re-solder it, is Bourns Inc. ENS1D-B28-L00100L cost is about $58 in DigiKey and $45 in Mouser On Thu, Feb 6, 2020 at 11:57 AM K9MA wrote: > On 2/6/2020 10:03, Gary K9GS wrote: > > Hi All,I finally found some time this morning to take apart my > K3.Removing the front panel was relatively easy. I swapped the VFO A and > VFO B encoders and I did have a defective VFO B encoder .I've ordered a > replacement encoder from Elecraft, $60 plus shipping. 73,Gary K9GS > > I haven't had any failures, but a while ago I ordered some spare > encoders and pots for my K3, just in case they aren't available in the > future. > > 73, > > Scott K9MA > > -- > Scott K9MA > > k...@sdellington.us > > __ > 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 alex.k...@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] VFO B dead
On 2/6/2020 10:03, Gary K9GS wrote: Hi All,I finally found some time this morning to take apart my K3.Removing the front panel was relatively easy. I swapped the VFO A and VFO B encoders and I did have a defective VFO B encoder .I've ordered a replacement encoder from Elecraft, $60 plus shipping. 73,Gary K9GS I haven't had any failures, but a while ago I ordered some spare encoders and pots for my K3, just in case they aren't available in the future. 73, Scott K9MA -- Scott K9MA k...@sdellington.us __ 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] VFO B dead
Hi All,I finally found some time this morning to take apart my K3.Removing the front panel was relatively easy. I swapped the VFO A and VFO B encoders and I did have a defective VFO B encoder .I've ordered a replacement encoder from Elecraft, $60 plus shipping. 73,Gary K9GS Original message From: Gary K9GS Date: 1/27/20 9:59 AM (GMT-06:00) To: elecraft@mailman.qth.net Subject: Re: [Elecraft] VFO B dead Thank you Vic and others.It's been a long time since I assembled my K3. I reviewed the assembly documentation last night. I did not remember that the encoders plug into the PCBA. It looks like a pretty straightforward disassembly and reassembly.Vic asked if the encoder could have come unplugged, possibly in shipping when my K3 was back at Elecraft. I'm not sure how that could happen since the encoder is attached to the front panel with a nut. The nut and the VFO knob would have to both be missing for that to happen. I just wonder if since I have to take the whole front panel off to replace, should I just order replacements?Does anyone know if the encoders can be replaced if I remove the knob and nut without taking the front panel off?If I get some time this week I'll open up the K3 and take a look.73,Gary K9GS Original message From: Victor Rosenthal Date: 1/26/20 11:56 PM (GMT-06:00) To: elecraft@mailman.qth.net, Gary K9GS Subject: Re: [Elecraft] VFO B dead ...and the first thing to check is that one of them hasn't come unplugged!73,Victor, 4X6GPRehovot, IsraelFormerly K2VCOCWops no. 5http://www.qsl.net/k2vco/On 27/01/2020 6:38, Nr4c wrote: > Download the K3 Assembly Manual. I believe they just plug in. > > Sent from my iPhone > ...nr4c. bill > > >> On Jan 26, 2020, at 10:50 PM, Gary K9GS wrote: >> >> Hello Don,How difficult is it to replace the encoders? Is there a document that describes the procedure?73,Gary K9GS >> Original message From: Don Wilhelm Date: 1/26/20 8:15 PM (GMT-06:00) To: Gary K9GS , Elecraft@mailman.qth.net Subject: Re: [Elecraft] VFO B dead Gary,If you are not afraid of disassembling your K3, remove the Front Panel assembly and swap the encoder A with encoder B. If the problem follows the encoder, then order a new encoder from Elecraft. If that is not the problem, contact supp...@elecraft.com for additional checks.73,Don W3FPR__Elecraft mailing listHome: http://mailman.qth.net/mailman/listinfo/elecraftHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:elecr...@mailman.qth.netThis list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.htmlMessage delivered to k...@gjschwartz.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] RF feedback into MH3 mic with KX3 on 2m
That didn't fix it. Found this lunchtime with a real antenna: - Worked OK with case open, testing the idea it was coupling from the 2m module itself. - Worked on other mic (SoundMagic earbuds and mic) - Touching the case with metal made interesting noises on receive. - HF (20m) seemed OK, if I take the response "America only please" as indicative the other station heard me and my signal was good enough for him to tell I was not in America. - Richard On Wed, 5 Feb 2020 at 22:07, Richard Corfield wrote: > The metal shield cover on the 2m module was not flat but slightly raised > at the edge. I have pressed this back on and the problem seems cleared. So > I guess it was contacting or coming close to the circuit board on the > control module, perhaps that giving the feedback loop for RF. Question is - > could any damage have done if it had contacted the vias/pads on the board > there? > > - Richard > > On Wed, 5 Feb 2020 at 21:01, Richard Corfield > wrote: > >> I've done some further tests and proven the problem is with the MH3. So >> I'll have to take that apart and look for the problem. >> The radio is fine with little earbuds/mic plugged in via splitter cable. >> Swap out the mic on the earbuds with the MH3 and leave all the rest the >> same and it goes wrong. >> >> Thanks >> - Richard >> >> On Wed, 5 Feb 2020 at 15:29, Nr4c wrote: >> >>> Turn down TX Monitor volume. >>> >>> Sent from my iPhone >>> ...nr4c. bill >>> >>> >>> > On Feb 5, 2020, at 5:23 AM, Richard Corfield < >>> richard.corfi...@gmail.com> wrote: >>> > >>> > I had issues with RF feedback on the MH3 during the UKAC SSB 2m >>> contest >>> > last night. It seemed intermittent. Result was terrible noise in >>> Monitor >>> > output (my headphones) and to the other station, so it affects the >>> audio >>> > input. With experiments at the time and this morning: >>> > >>> > >>> > - Occurs when RF power is increased above 0 and when Mic Gain is >>> > increased. I could operate with Mic Gain set low, obviously at >>> reduced >>> > power out. (Indicative of a feedback loop) >>> > - Occurs with a dummy load. (Also when I moved the antenna away last >>> > night). So is the loop internal or is it so sensitive the small leak >>> from a >>> > dummy load is enough? >>> > - Does not occur if I feed a stage Mic In through a field mixer (kit >>> I >>> > have to hand). The field mixer claims an output impedance of 150R >>> and is >>> > running at mic level to match the MH3 allowing same gain setup in >>> the KX3. >>> > Mic Bias is turned off in this case. >>> > - Does not occur on HF into the dummy load. >>> > - Manifests as buzzing on 2m FM >>> > - May result in phantom button presses on the KX3 Mic (I didn't >>> think I >>> > knocked the dial) >>> > >>> > As an aside - one station last night was loud enough to activate the >>> "RX" >>> > indicator which I take to be input overload. S meter was well over S9 >>> but >>> > not at the top. I didn't see anyone else at the site, unless they were >>> > hiding the the woodland carpark but I saw no light there or on the >>> summit >>> > behind me. I hit ATT, should have swung the beam to try to null them. >>> But I >>> > guess the ATT and even maybe the input protection is after the 2m >>> module's >>> > input? >>> > >>> > My thought is I need to inspect the wiring in the mic. Or could there >>> be >>> > anything else I need to check? >>> > >>> > Thanks >>> > - Richard >>> > __ >>> > 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 n...@widomaker.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
