Re: [Elecraft] KX1 ATU - Alignment Test
It's ALL good! I used the milivolt setting on my DMM, and really fine tuned C9 for the null which is really sharp. Now the power meter is reading correctly, and I am good to go. I will be heading to the deck tonight to toss up my end fed antenna, and give it a whirl. My CW is pretty rusty - but if you are listening on 40 near the QRP calling freq - and have patience, I would love to work anyone out there! Don, thanks so much for all your help! The KX1 has been a really fun little project, and I hope to build more Elecraft kits in the future. Burke Jones http://N0HYD.com http://n0hyd.com/ On Wed, Jul 8, 2009 at 6:01 PM, Don Wilhelm w3...@embarqmail.com wrote: Burke, Yes, do set C9 for the null as indicated in the manual. It makes a BIG difference in both the forward and reverse (SWR) power readings. If the KXAT1 does not show decent power out - in ATU CAL mode into a 50 ohm dummy load, then remove the KXAT1 and install the jumper at J7, then using a known accurate external wattmeter, tell us what the power output on the base KX1 is for each band - ideally, power the KX1 from a 13.8 volt power supply - the reference data I have is based on that power supply voltage, and lower voltages will result in lower power outputs. 73, Don W3FPR Burke Jones wrote: I know this is an old thread, but I thought I would revisit it. After a couple of months of life I was finally able to get back down to the bench. I picked up the ATU and immediately noticed a big white rectangle with no part. I had forgotten to install R5! I don't know how many times I had looked at that board and not noticed it, but last night it jumped right out and got me. Now the display is showing power out, but not what it should be. It is under a watt output on 40 and 20. I will spend some more time tonight looking it over and be sure I have C9 properly set. Anyway, I thought you would appreciate the update! Burke http://N0HYD.com http://n0hyd.com/ http://n0hyd.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
Re: [Elecraft] KX1 ATU - Alignment Test
I know this is an old thread, but I thought I would revisit it. After a couple of months of life I was finally able to get back down to the bench. I picked up the ATU and immediately noticed a big white rectangle with no part. I had forgotten to install R5! I don't know how many times I had looked at that board and not noticed it, but last night it jumped right out and got me. Now the display is showing power out, but not what it should be. It is under a watt output on 40 and 20. I will spend some more time tonight looking it over and be sure I have C9 properly set. Anyway, I thought you would appreciate the update! Burke http://N0HYD.com http://n0hyd.com/ On Wed, Apr 15, 2009 at 8:46 AM, Don Wilhelm w3...@embarqmail.com wrote: Burke, First make certain D1 is oriented correctly. Can you verify that you are actually getting 2 watts or more output? If so, please do that. If you actually do have output, make the following measurements during transmit: 1) Cathode of D1 - the voltage will depend on the transmit power 2) P3 pin 5 - the voltage should be about half of the voltage in 1) above (depends on R1 setting) 3) KX1 U1 pin 2 - the voltage should be the same as in 2) above if all connections are solid. If those voltages are as I have indicated, then remove the KX1 board from the enclosure and check the socketed firmware chip. Pin 2 should be properly inserted into the socket, not sticking out to the side or bent under. If all looks good so far, solder a test point lead on the firmware chip itself and bring it out to the end so you can measure the voltage directly on the chip lead after putting the KX1 board back in the enclosure. Make the check again and see if you have the same voltage at the chip lead as you do at the bottom of the socket. If the voltage is the same, you need to install a replacement firmware chip. If you have proper voltage at one point, but not the next, there is a bad connection between those two points. 73, Don W3FPR Burke Jones wrote: Okay, I have assembled the KXAT1 ATU for the KX1. I got it installed into the rig tonight and I am working on the Alignment Test section on Page 7 of the manual. I did preset R1 R2 per the errata picture. Everything went fine until I started adjusting C9 for the lowest possible voltmeter reading. I have a MV scale on my DMM. The first problem I noticed was that when I entered the TUNE mode, my display showed P0.0 with a 12.4V power supply. I adjusted C9 to give me .2 mv on my DMM - the lowest I could get. When I canceled TUNE MODE it showed r1.0. I was running it into my 50 ohm dummy load by the way. Should the display show something other than P0.0? Sometimes it would briefly show P0.1 - but on for a split second. I could hear the signal being transmitted into the dummy load on another receiver - so it is transmitting. Any thoughts? Burke Jones N0HYD - Olathe, KS http://www.n0hyd.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
Re: [Elecraft] KX1 ATU - Alignment Test
Burke, Yes, do set C9 for the null as indicated in the manual. It makes a BIG difference in both the forward and reverse (SWR) power readings. If the KXAT1 does not show decent power out - in ATU CAL mode into a 50 ohm dummy load, then remove the KXAT1 and install the jumper at J7, then using a known accurate external wattmeter, tell us what the power output on the base KX1 is for each band - ideally, power the KX1 from a 13.8 volt power supply - the reference data I have is based on that power supply voltage, and lower voltages will result in lower power outputs. 73, Don W3FPR Burke Jones wrote: I know this is an old thread, but I thought I would revisit it. After a couple of months of life I was finally able to get back down to the bench. I picked up the ATU and immediately noticed a big white rectangle with no part. I had forgotten to install R5! I don't know how many times I had looked at that board and not noticed it, but last night it jumped right out and got me. Now the display is showing power out, but not what it should be. It is under a watt output on 40 and 20. I will spend some more time tonight looking it over and be sure I have C9 properly set. Anyway, I thought you would appreciate the update! Burke http://N0HYD.com http://n0hyd.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
Re: [Elecraft] KX1 ATU - Alignment Test
Burke, First make certain D1 is oriented correctly. Can you verify that you are actually getting 2 watts or more output? If so, please do that. If you actually do have output, make the following measurements during transmit: 1) Cathode of D1 - the voltage will depend on the transmit power 2) P3 pin 5 - the voltage should be about half of the voltage in 1) above (depends on R1 setting) 3) KX1 U1 pin 2 - the voltage should be the same as in 2) above if all connections are solid. If those voltages are as I have indicated, then remove the KX1 board from the enclosure and check the socketed firmware chip. Pin 2 should be properly inserted into the socket, not sticking out to the side or bent under. If all looks good so far, solder a test point lead on the firmware chip itself and bring it out to the end so you can measure the voltage directly on the chip lead after putting the KX1 board back in the enclosure. Make the check again and see if you have the same voltage at the chip lead as you do at the bottom of the socket. If the voltage is the same, you need to install a replacement firmware chip. If you have proper voltage at one point, but not the next, there is a bad connection between those two points. 73, Don W3FPR Burke Jones wrote: Okay, I have assembled the KXAT1 ATU for the KX1. I got it installed into the rig tonight and I am working on the Alignment Test section on Page 7 of the manual. I did preset R1 R2 per the errata picture. Everything went fine until I started adjusting C9 for the lowest possible voltmeter reading. I have a MV scale on my DMM. The first problem I noticed was that when I entered the TUNE mode, my display showed P0.0 with a 12.4V power supply. I adjusted C9 to give me .2 mv on my DMM - the lowest I could get. When I canceled TUNE MODE it showed r1.0. I was running it into my 50 ohm dummy load by the way. Should the display show something other than P0.0? Sometimes it would briefly show P0.1 - but on for a split second. I could hear the signal being transmitted into the dummy load on another receiver - so it is transmitting. Any thoughts? Burke Jones N0HYD - Olathe, KS http://www.n0hyd.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
