Re: [Elecraft] Issues with KPA100 (K2/10 is 100% OK)
Hi, the KPA100 is alive. I startet to desolder D16 and D17 but D16 broke. D17 was OK. I soldered two new 1N5711 and now after some minor adjustments the KPA100 is back! best regards Holger. DL9HDA Am 2014-05-05 22:20, schrieb Don Wilhelm: Holger, That indicates that D11 is shorted. I would replace D11, D12 and D14 and remeasure. Do not substitute - use only 1N4007s. While those are normally power diodes, they work well for switching purposes too, and that is not true of most other diode types. 73, Don W3FPR On 5/5/2014 4:05 PM, dl9...@dl9hda.de wrote: Dear Don, thank you very much for your answer. I checked it with an wattmeter and a dummy load. Nothing. But I checked the voltages at the diodes especially D11, D12, D13 and D14 in receive-mode: D12 and D14 have the right voltages at the anodes and cathodes when I switch from low-power to high-power and vice-versa. But the voltages at D11 and D13 are wrong. The voltages at the anodes and cathodes are always 13,8V. There are no voltages about ~140V. At D12 and D14 I can measure this high voltages at the cathodes. best regards Holger, DL9HDA Am 2014-05-05 21:55, schrieb Don Wilhelm: Holger, Those resistance values indicate that D16 and D17 in the KPA100 are faulty. The resistance in the forward direction should normally be much lower. You can check to see if your ohmmeter is reading properly by measuring a new or known good small signal diode. I believe if you check the power output with an external wattmeter and connected to a dummy load, you will find a higher than normal power even though the K2 display and LED Bargraph indicate no power. You might want to check D1 and D2 in the KAT100 as well. 73, Don W3FPR On 5/5/2014 3:09 PM, dl9...@dl9hda.de wrote: Hi, my K2 works well but I have issues with my KPA100. KPA100 and KAT100 are both situated in an external enclosure but the KAT100 is permanently disabled (cal-mode). I used the KPA100 to drive my tube-amplifier ... I cannot exactly say what happend but for a year or so the maximum output power on all bands has been only 60W. It's enough for the tube-pa but now the output is zero. If I change the band or hit the antenna-switch the relays are working. So the communication seems to be OK. While pressing tune the K2 says high current and there is absolutely no output-power an the K2 and of course at the KPA100. (The K2 without any connections to the second enclosure works pretty well!!!). So the first guess was to check the diodes D16 and D17. I did not desolder them but I made some measurements with mit Fluke 177. D16: Diode-Voltage zero and the other direction shows 0.390 V. The resistor-values are 95.7 KOhms and 104,6 KOhms D17: Diode-Voltage zero and the other direction shows 0.387 V. The resistor-values are 95.5 KOhms and 105,2 KOhms __ 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 dl9...@darc.de __ 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 w3...@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
Re: [Elecraft] Issues with KPA100 (K2/10 is 100% OK)
That is good news Holger. 73, Don W3FPR On 5/8/2014 3:53 PM, dl9...@dl9hda.de wrote: Hi, the KPA100 is alive. I startet to desolder D16 and D17 but D16 broke. D17 was OK. I soldered two new 1N5711 and now after some minor adjustments the KPA100 is back! __ 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] Issues with KPA100 (K2/10 is 100% OK)
Holger, Those resistance values indicate that D16 and D17 in the KPA100 are faulty. The resistance in the forward direction should normally be much lower. You can check to see if your ohmmeter is reading properly by measuring a new or known good small signal diode. I believe if you check the power output with an external wattmeter and connected to a dummy load, you will find a higher than normal power even though the K2 display and LED Bargraph indicate no power. You might want to check D1 and D2 in the KAT100 as well. 73, Don W3FPR On 5/5/2014 3:09 PM, dl9...@dl9hda.de wrote: Hi, my K2 works well but I have issues with my KPA100. KPA100 and KAT100 are both situated in an external enclosure but the KAT100 is permanently disabled (cal-mode). I used the KPA100 to drive my tube-amplifier ... I cannot exactly say what happend but for a year or so the maximum output power on all bands has been only 60W. It's enough for the tube-pa but now the output is zero. If I change the band or hit the antenna-switch the relays are working. So the communication seems to be OK. While pressing tune the K2 says high current and there is absolutely no output-power an the K2 and of course at the KPA100. (The K2 without any connections to the second enclosure works pretty well!!!). So the first guess was to check the diodes D16 and D17. I did not desolder them but I made some measurements with mit Fluke 177. D16: Diode-Voltage zero and the other direction shows 0.390 V. The resistor-values are 95.7 KOhms and 104,6 KOhms D17: Diode-Voltage zero and the other direction shows 0.387 V. The resistor-values are 95.5 KOhms and 105,2 KOhms __ 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] Issues with KPA100 (K2/10 is 100% OK)
Dear Don, thank you very much for your answer. I checked it with an wattmeter and a dummy load. Nothing. But I checked the voltages at the diodes especially D11, D12, D13 and D14 in receive-mode: D12 and D14 have the right voltages at the anodes and cathodes when I switch from low-power to high-power and vice-versa. But the voltages at D11 and D13 are wrong. The voltages at the anodes and cathodes are always 13,8V. There are no voltages about ~140V. At D12 and D14 I can measure this high voltages at the cathodes. best regards Holger, DL9HDA Am 2014-05-05 21:55, schrieb Don Wilhelm: Holger, Those resistance values indicate that D16 and D17 in the KPA100 are faulty. The resistance in the forward direction should normally be much lower. You can check to see if your ohmmeter is reading properly by measuring a new or known good small signal diode. I believe if you check the power output with an external wattmeter and connected to a dummy load, you will find a higher than normal power even though the K2 display and LED Bargraph indicate no power. You might want to check D1 and D2 in the KAT100 as well. 73, Don W3FPR On 5/5/2014 3:09 PM, dl9...@dl9hda.de wrote: Hi, my K2 works well but I have issues with my KPA100. KPA100 and KAT100 are both situated in an external enclosure but the KAT100 is permanently disabled (cal-mode). I used the KPA100 to drive my tube-amplifier ... I cannot exactly say what happend but for a year or so the maximum output power on all bands has been only 60W. It's enough for the tube-pa but now the output is zero. If I change the band or hit the antenna-switch the relays are working. So the communication seems to be OK. While pressing tune the K2 says high current and there is absolutely no output-power an the K2 and of course at the KPA100. (The K2 without any connections to the second enclosure works pretty well!!!). So the first guess was to check the diodes D16 and D17. I did not desolder them but I made some measurements with mit Fluke 177. D16: Diode-Voltage zero and the other direction shows 0.390 V. The resistor-values are 95.7 KOhms and 104,6 KOhms D17: Diode-Voltage zero and the other direction shows 0.387 V. The resistor-values are 95.5 KOhms and 105,2 KOhms __ 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 dl9...@darc.de __ 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] Issues with KPA100 (K2/10 is 100% OK)
Holger, That indicates that D11 is shorted. I would replace D11, D12 and D14 and remeasure. Do not substitute - use only 1N4007s. While those are normally power diodes, they work well for switching purposes too, and that is not true of most other diode types. 73, Don W3FPR On 5/5/2014 4:05 PM, dl9...@dl9hda.de wrote: Dear Don, thank you very much for your answer. I checked it with an wattmeter and a dummy load. Nothing. But I checked the voltages at the diodes especially D11, D12, D13 and D14 in receive-mode: D12 and D14 have the right voltages at the anodes and cathodes when I switch from low-power to high-power and vice-versa. But the voltages at D11 and D13 are wrong. The voltages at the anodes and cathodes are always 13,8V. There are no voltages about ~140V. At D12 and D14 I can measure this high voltages at the cathodes. best regards Holger, DL9HDA Am 2014-05-05 21:55, schrieb Don Wilhelm: Holger, Those resistance values indicate that D16 and D17 in the KPA100 are faulty. The resistance in the forward direction should normally be much lower. You can check to see if your ohmmeter is reading properly by measuring a new or known good small signal diode. I believe if you check the power output with an external wattmeter and connected to a dummy load, you will find a higher than normal power even though the K2 display and LED Bargraph indicate no power. You might want to check D1 and D2 in the KAT100 as well. 73, Don W3FPR On 5/5/2014 3:09 PM, dl9...@dl9hda.de wrote: Hi, my K2 works well but I have issues with my KPA100. KPA100 and KAT100 are both situated in an external enclosure but the KAT100 is permanently disabled (cal-mode). I used the KPA100 to drive my tube-amplifier ... I cannot exactly say what happend but for a year or so the maximum output power on all bands has been only 60W. It's enough for the tube-pa but now the output is zero. If I change the band or hit the antenna-switch the relays are working. So the communication seems to be OK. While pressing tune the K2 says high current and there is absolutely no output-power an the K2 and of course at the KPA100. (The K2 without any connections to the second enclosure works pretty well!!!). So the first guess was to check the diodes D16 and D17. I did not desolder them but I made some measurements with mit Fluke 177. D16: Diode-Voltage zero and the other direction shows 0.390 V. The resistor-values are 95.7 KOhms and 104,6 KOhms D17: Diode-Voltage zero and the other direction shows 0.387 V. The resistor-values are 95.5 KOhms and 105,2 KOhms __ 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 dl9...@darc.de __ 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 w3...@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
Re: [Elecraft] Issues with KPA100 (K2/10 is 100% OK)
Holger, I didn't think of it before the last response, but be certain you are using the correct Diode Voltage chart. If you have a newer KPA100 or one that has been upgraded - with blue toroid cores at RFC1 and L15, then you must use the newer voltage chart (download the most recent KPA100 manual). With the newer design, the only place you will find a high voltage is at the cathodes of D12 and D14. OTOH, if you had red toroid cores at L15 and L16, you have the older KPA100 and the Diode Voltages in your manual should be correct. 73, Don W3FPR On 5/5/2014 4:05 PM, dl9...@dl9hda.de wrote: Dear Don, thank you very much for your answer. I checked it with an wattmeter and a dummy load. Nothing. But I checked the voltages at the diodes especially D11, D12, D13 and D14 in receive-mode: D12 and D14 have the right voltages at the anodes and cathodes when I switch from low-power to high-power and vice-versa. But the voltages at D11 and D13 are wrong. The voltages at the anodes and cathodes are always 13,8V. There are no voltages about ~140V. At D12 and D14 I can measure this high voltages at the cathodes. best regards Holger, DL9HDA Am 2014-05-05 21:55, schrieb Don Wilhelm: Holger, Those resistance values indicate that D16 and D17 in the KPA100 are faulty. The resistance in the forward direction should normally be much lower. You can check to see if your ohmmeter is reading properly by measuring a new or known good small signal diode. I believe if you check the power output with an external wattmeter and connected to a dummy load, you will find a higher than normal power even though the K2 display and LED Bargraph indicate no power. You might want to check D1 and D2 in the KAT100 as well. 73, Don W3FPR On 5/5/2014 3:09 PM, dl9...@dl9hda.de wrote: Hi, my K2 works well but I have issues with my KPA100. KPA100 and KAT100 are both situated in an external enclosure but the KAT100 is permanently disabled (cal-mode). I used the KPA100 to drive my tube-amplifier ... I cannot exactly say what happend but for a year or so the maximum output power on all bands has been only 60W. It's enough for the tube-pa but now the output is zero. If I change the band or hit the antenna-switch the relays are working. So the communication seems to be OK. While pressing tune the K2 says high current and there is absolutely no output-power an the K2 and of course at the KPA100. (The K2 without any connections to the second enclosure works pretty well!!!). So the first guess was to check the diodes D16 and D17. I did not desolder them but I made some measurements with mit Fluke 177. D16: Diode-Voltage zero and the other direction shows 0.390 V. The resistor-values are 95.7 KOhms and 104,6 KOhms D17: Diode-Voltage zero and the other direction shows 0.387 V. The resistor-values are 95.5 KOhms and 105,2 KOhms __ 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 dl9...@darc.de __ 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 w3...@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
