Did I fry my KXPA100?
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HI,
I seem to be having troubles with my KXPA100. There is no power output as indicated on the power out display on the amp either into an antenna or dummy load. The amp’s TX light does go on. If I open the KXPA utility and look at the Operate section, Input power always stays at 0, even though the KX3 shows power output near 100W on it’s power display except when you press the Tune button. Then it shows 10W Sending the output of the KX3 to a dummy load shows that the amp is getting 10W power .. If I transmit on the KX3 into the KXPA100 with 10W, the Operate section in the KPXA utility shows the following: Input Power = 0.0 Drain Current = 4-8A (using voice....) Supply Voltage 13.4V Dissipated power = 50-90W Forward power = 0 reflected power =0 Last SWR= 1.2 This is into a dummy load or antenna Holding down the tune button the KX3 shows Input power at 10.0 but of course the amp then goes into bypass. Anyone have any ideas? Thanks, Tom --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Hi,
Just to be sure, I disconnected all control signal, only RF into the amp at 10W.... No output, but no errors in the KXPA100 utility. 73 Tom va2fsq.com -----Original Message----- From: Tom Sent: Friday, October 27, 2017 3:15 PM To: Elecraft Subject: [Elecraft] Did I fry my KXPA100? HI, I seem to be having troubles with my KXPA100. There is no power output as indicated on the power out display on the amp either into an antenna or dummy load. The amp’s TX light does go on. If I open the KXPA utility and look at the Operate section, Input power always stays at 0, even though the KX3 shows power output near 100W on it’s power display except when you press the Tune button. Then it shows 10W Sending the output of the KX3 to a dummy load shows that the amp is getting 10W power .. If I transmit on the KX3 into the KXPA100 with 10W, the Operate section in the KPXA utility shows the following: Input Power = 0.0 Drain Current = 4-8A (using voice....) Supply Voltage 13.4V Dissipated power = 50-90W Forward power = 0 reflected power =0 Last SWR= 1.2 This is into a dummy load or antenna Holding down the tune button the KX3 shows Input power at 10.0 but of course the amp then goes into bypass. Anyone have any ideas? Thanks, Tom --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Tom,
Did you connect the KX3 Keyout signal into the KXPA100 PA KEY input? That is necessary for 'Basic Operation' - see page 18 of the manual. 73, Don W3FPR On 10/27/2017 3:24 PM, Tom wrote: > Hi, > Just to be sure, I disconnected all control signal, only RF into the amp > at 10W.... > No output, but no errors in the KXPA100 utility. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by tomb18
Hi,
No, I didn't. However, it seems that the amp is not blown. I have no idea what's happening... Ok, Elecraft recommended a TX Gain calibration. That was successful on all bands. I changed all the RF cables and the KXPA100 still shows no output... However, this was on 20m. If I switch bands, the KPXA100 is working fine on all other bands. It just so happens that this seems to happen only on 20m. Everything looks the same as far as I can tell, same antenna (all testing is into a dummy load) So it is only on 20m. What have I missed? Thanks, Tom -----Original Message----- From: Don Wilhelm Sent: Friday, October 27, 2017 4:34 PM To: Tom ; Elecraft Subject: Re: [Elecraft] Did I fry my KXPA100? Tom, Did you connect the KX3 Keyout signal into the KXPA100 PA KEY input? That is necessary for 'Basic Operation' - see page 18 of the manual. 73, Don W3FPR On 10/27/2017 3:24 PM, Tom wrote: > Hi, > Just to be sure, I disconnected all control signal, only RF into the amp > at 10W.... > No output, but no errors in the KXPA100 utility. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Tom,
I certainly don't know what the problem may be, but someone in support may be able to help you. 73, Don W3FPR On 10/27/2017 4:56 PM, Tom wrote: > Hi, > No, I didn't. > However, it seems that the amp is not blown. > I have no idea what's happening... > > Ok, Elecraft recommended a TX Gain calibration. That was successful > on all bands. > I changed all the RF cables and the KXPA100 still shows no output... > > However, this was on 20m. > If I switch bands, the KPXA100 is working fine on all other bands. It > just so happens that this seems to happen only on 20m. > Everything looks the same as far as I can tell, same antenna (all > testing is into a dummy load) > So it is only on 20m. > What have I missed? ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by tomb18
Hi,
The problem appears to be blown relays for the 20m LPF in the KXPA100. 73 Tom va2fsq.com -----Original Message----- From: Don Wilhelm Sent: Friday, October 27, 2017 5:48 PM To: Tom ; Elecraft Subject: Re: [Elecraft] Did I fry my KXPA100? Tom, I certainly don't know what the problem may be, but someone in support may be able to help you. 73, Don W3FPR On 10/27/2017 4:56 PM, Tom wrote: > Hi, > No, I didn't. > However, it seems that the amp is not blown. > I have no idea what's happening... > > Ok, Elecraft recommended a TX Gain calibration. That was successful > on all bands. > I changed all the RF cables and the KXPA100 still shows no output... > > However, this was on 20m. > If I switch bands, the KPXA100 is working fine on all other bands. It > just so happens that this seems to happen only on 20m. > Everything looks the same as far as I can tell, same antenna (all > testing is into a dummy load) > So it is only on 20m. > What have I missed? --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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