Re: [Elecraft] KPA500 Power Gain
As a Contester, can I add my unadulterated AMEN to this post? I have a great receiver with my K3, but when on SSB, I am always at the mercy of everybody else's IMD products which no amount of filtering can completely get rid of. Pointers high bouncing clean signals make not Yankee Zero Delta Alpha, the DX Jedi :) -lu-W4LT- K3 # 3192 The last thing our ham bands need is more loud lids spewing trash. __ 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
[Elecraft] KPA500 Power Gain
On 3/16/2011 11:02 AM, David Cutter wrote: A European model will be required: It might be NICE to be able to drive it at lower power, but I don't understand why it is REQUIRED. It would be NICE to be able to drive it to rated power from a barefoot K3/10 (or K2/10), but that could push the driver to the point where it produces a bit more IM and THD (that is, splatter and harmonics). That's the main reason that firmware for the K3/100 now limits output power to 110 watts. we don't have the gain restriction you have, however, we do like stability and putting lots of gain into one box could be tricky. The Elecraft design engineers are quite sharp, and have carefully thought quite things like this. As a result of my own EE background and ongoing conversations with one of them who is a neighbor (and a serious contester), I'm firmly convinced that they have made a very intelligent set of design decisions about these issues. The last thing our ham bands need is more loud lids spewing trash. 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
Re: [Elecraft] KPA500 Power Gain
Well, it's NICE that you can see the tongue firmly in my cheek, Jim. I presume the others on this thread are thinking the same way. 73 David G3UNA On 3/16/2011 11:02 AM, David Cutter wrote: A European model will be required: It might be NICE to be able to drive it at lower power, but I don't understand why it is REQUIRED. It would be NICE to be able to drive it to rated power from a barefoot K3/10 (or K2/10), but that could push the driver to the point where it produces a bit more IM and THD (that is, splatter and harmonics). That's the main reason that firmware for the K3/100 now limits output power to 110 watts. we don't have the gain restriction you have, however, we do like stability and putting lots of gain into one box could be tricky. The Elecraft design engineers are quite sharp, and have carefully thought quite things like this. As a result of my own EE background and ongoing conversations with one of them who is a neighbor (and a serious contester), I'm firmly convinced that they have made a very intelligent set of design decisions about these issues. The last thing our ham bands need is more loud lids spewing trash. 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
Re: [Elecraft] KPA500 Power Gain
The question is: Is it feasible to improve the KPA500 to full output with k3/10. Why should someone in Europe invest into the 100W PA if it is possible? 73, István Szabó On 3/16/2011 8:03 PM, David Cutter wrote: Well, it's NICE that you can see the tongue firmly in my cheek, Jim. I presume the others on this thread are thinking the same way. 73 David G3UNA On 3/16/2011 11:02 AM, David Cutter wrote: A European model will be required: It might be NICE to be able to drive it at lower power, but I don't understand why it is REQUIRED. It would be NICE to be able to drive it to rated power from a barefoot K3/10 (or K2/10), but that could push the driver to the point where it produces a bit more IM and THD (that is, splatter and harmonics). That's the main reason that firmware for the K3/100 now limits output power to 110 watts. we don't have the gain restriction you have, however, we do like stability and putting lots of gain into one box could be tricky. The Elecraft design engineers are quite sharp, and have carefully thought quite things like this. As a result of my own EE background and ongoing conversations with one of them who is a neighbor (and a serious contester), I'm firmly convinced that they have made a very intelligent set of design decisions about these issues. The last thing our ham bands need is more loud lids spewing trash. 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 __ 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] KPA500 Power Gain
For portable use without mains power - 100W on batteries works fine. 73 de M0XDF, K3 #174, P3 #108 -- Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it. -Mark Twain, author and humorist (1835-1910) On 16 Mar 2011, at 20:17, István Szabó wrote: The question is: Is it feasible to improve the KPA500 to full output with k3/10. Why should someone in Europe invest into the 100W PA if it is possible? __ 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] KPA500 Power Gain
On 3/16/2011 1:17 PM, István Szabó wrote: Is it feasible to improve the KPA500 to full output with k3/10. Why should someone in Europe invest into the 100W PA if it is possible? Please go back and read what I wrote. 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
Re: [Elecraft] KPA500 Power Gain
Regardless of FCC requirements, it is not feasible or desirable to modify the KPA500 for lower power drive with a 10W exciter. Any modification of the input network to the KPA500 will seriously degrade the input SWR to the amplifier and also will put the KPA500 transistors at a strong risk of destruction from accidental over drive. Our protection circuitry and firmware are tightly integrated to provide a very reliable bullet-proof design. 73, Eric WA6HHQ __ 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
[Elecraft] KPA500 Power Gain
Agreed and the sale of KPA3 and KPA100 will be maintained as well. On the other hand, I would like to have stainless steel screws in KPA500 as a standard provision. Summer in Hong Kong is very humid. I have already changed all the screws in my K3 with SS so as to avoid rusting. cheers, Johnny VR2XMC 寄件人﹕ Jim Brown j...@audiosystemsgroup.com 收件人﹕ elecraft@mailman.qth.net 傳送日期﹕ 2011/3/17 (四) 2:58:08 AM 主題： [Elecraft] KPA500 Power Gain On 3/16/2011 11:02 AM, David Cutter wrote: A European model will be required: It might be NICE to be able to drive it at lower power, but I don't understand why it is REQUIRED. It would be NICE to be able to drive it to rated power from a barefoot K3/10 (or K2/10), but that could push the driver to the point where it produces a bit more IM and THD (that is, splatter and harmonics). That's the main reason that firmware for the K3/100 now limits output power to 110 watts. we don't have the gain restriction you have, however, we do like stability and putting lots of gain into one box could be tricky. The Elecraft design engineers are quite sharp, and have carefully thought quite things like this. As a result of my own EE background and ongoing conversations with one of them who is a neighbor (and a serious contester), I'm firmly convinced that they have made a very intelligent set of design decisions about these issues. The last thing our ham bands need is more loud lids spewing trash. 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 __ 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
