KXPA100
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Guys— My KX3 is currently connected to my KXPA100 and is used to drive an Ameritron AL-811. The setup is as follows KX3——KXPA100——AL-811——MFJ-994B tuner—Daywa CN901—-Hexbeam The KX3 and the KXPA100 auto-tunners are off. I tune with the MFJ with the amp in bypass. The Hexbeam is resonate at 1.5 or less before tuning. I us an Ameritron ARB-704 to key the amp. When I transmit the SWR LEDs On the KXPA100 are peaked out. Daywa to the antenna shows less than 1.2 SWR. Am I doing something wrong here. I am using about 20W from the KX3 to drive the Amp to about 450W Thanks Charlie N7CAC ______________________________________________________________ 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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Given you already have an SWR of 1.5 or less with the hexnbeam, the MFJ tuner is just adding loss.
It could be the KXPA100 doesn’t like the AL-811 input circuits. If the SWR is low (on the KXPA100) with the 811 bypassed, and high when the 811 is in line, then I’d suspect the 811 input. You could try putting a dummy load on the amp, the Daiwa 901 between the KXPA100 and the amp, and see how the KXPA and Daiwa compare. Or turn on the antenna tuner on in the KXPA and see if it can tune out the reactance of the amp input. You may just need to adjust the 811 input network for a better SWR. The networks on my AL-1200 aged into an SWR of around 2.5. I always ran my K3 autotuner when driving the amp — too lazy to take off the 927 screws to remove the AL-1200 cover, slide it back, and adjust the input networks. Grant NQ5T K3 #2091, KX3 #8342 > On May 12, 2018, at 1:03 PM, Charles Carlon <[hidden email]> wrote: > > > > Guys— > > My KX3 is currently connected to my KXPA100 and is used to drive an Ameritron AL-811. The setup is as follows > > KX3——KXPA100——AL-811——MFJ-994B tuner—Daywa CN901—-Hexbeam > > The KX3 and the KXPA100 auto-tunners are off. I tune with the MFJ with the amp in bypass. > The Hexbeam is resonate at 1.5 or less before tuning. I us an Ameritron ARB-704 to key the amp. > > When I transmit the SWR LEDs On the KXPA100 are peaked out. > Daywa to the antenna shows less than 1.2 SWR. > > Am I doing something wrong here. I am using about 20W from the KX3 to drive the Amp to about 450W > > > > Thanks > Charlie > N7CAC > ______________________________________________________________ > 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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Probably a silly question: Did you turn off the tuner in the amp
(bypass it)? If not, it should be off. Rick nhc On 5/12/2018 10:31 AM, Grant Youngman wrote: > Given you already have an SWR of 1.5 or less with the hexnbeam, the MFJ tuner is just adding loss. > > It could be the KXPA100 doesn’t like the AL-811 input circuits. If the SWR is low (on the KXPA100) with the 811 bypassed, and high when the 811 is in line, then I’d suspect the 811 input. You could try putting a dummy load on the amp, the Daiwa 901 between the KXPA100 and the amp, and see how the KXPA and Daiwa compare. Or turn on the antenna tuner on in the KXPA and see if it can tune out the reactance of the amp input. You may just need to adjust the 811 input network for a better SWR. The networks on my AL-1200 aged into an SWR of around 2.5. I always ran my K3 autotuner when driving the amp — too lazy to take off the 927 screws to remove the AL-1200 cover, slide it back, and adjust the input networks. > > > Grant NQ5T > K3 #2091, KX3 #8342 > >> On May 12, 2018, at 1:03 PM, Charles Carlon <[hidden email]> wrote: >> >> >> >> Guys— >> >> My KX3 is currently connected to my KXPA100 and is used to drive an Ameritron AL-811. The setup is as follows >> >> KX3——KXPA100——AL-811——MFJ-994B tuner—Daywa CN901—-Hexbeam >> >> The KX3 and the KXPA100 auto-tunners are off. I tune with the MFJ with the amp in bypass. >> The Hexbeam is resonate at 1.5 or less before tuning. I us an Ameritron ARB-704 to key the amp. >> >> When I transmit the SWR LEDs On the KXPA100 are peaked out. >> Daywa to the antenna shows less than 1.2 SWR. >> >> Am I doing something wrong here. I am using about 20W from the KX3 to drive the Amp to about 450W >> >> >> >> Thanks >> Charlie >> N7CAC >> ______________________________________________________________ >> 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] ______________________________________________________________ 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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The KX3 and the KXPA100 tuners are bypassed
Charlie Sent from my iPad > On May 12, 2018, at 13:43, Rick WA6NHC <[hidden email]> wrote: > > Probably a silly question: Did you turn off the tuner in the amp (bypass it)? If not, it should be off. > > Rick nhc > > >> On 5/12/2018 10:31 AM, Grant Youngman wrote: >> Given you already have an SWR of 1.5 or less with the hexnbeam, the MFJ tuner is just adding loss. >> >> It could be the KXPA100 doesn’t like the AL-811 input circuits. If the SWR is low (on the KXPA100) with the 811 bypassed, and high when the 811 is in line, then I’d suspect the 811 input. You could try putting a dummy load on the amp, the Daiwa 901 between the KXPA100 and the amp, and see how the KXPA and Daiwa compare. Or turn on the antenna tuner on in the KXPA and see if it can tune out the reactance of the amp input. You may just need to adjust the 811 input network for a better SWR. The networks on my AL-1200 aged into an SWR of around 2.5. I always ran my K3 autotuner when driving the amp — too lazy to take off the 927 screws to remove the AL-1200 cover, slide it back, and adjust the input networks. >> >> >> Grant NQ5T >> K3 #2091, KX3 #8342 >> >>> On May 12, 2018, at 1:03 PM, Charles Carlon <[hidden email]> wrote: >>> >>> >>> >>> Guys— >>> >>> My KX3 is currently connected to my KXPA100 and is used to drive an Ameritron AL-811. The setup is as follows >>> >>> KX3——KXPA100——AL-811——MFJ-994B tuner—Daywa CN901—-Hexbeam >>> >>> The KX3 and the KXPA100 auto-tunners are off. I tune with the MFJ with the amp in bypass. >>> The Hexbeam is resonate at 1.5 or less before tuning. I us an Ameritron ARB-704 to key the amp. >>> >>> When I transmit the SWR LEDs On the KXPA100 are peaked out. >>> Daywa to the antenna shows less than 1.2 SWR. >>> >>> Am I doing something wrong here. I am using about 20W from the KX3 to drive the Amp to about 450W >>> >>> >>> >>> Thanks >>> Charlie >>> N7CAC >>> ______________________________________________________________ >>> 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] > > ______________________________________________________________ > 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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Also try to use a different coax and/or length of coax between the KPXA100
and the amp. John N1JM -- Sent from: http://elecraft.365791.n2.nabble.com/ ______________________________________________________________ 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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