And now the voice of caution. I think the KPA500 with the KAT500 and my Flex are a wonderful combination. That said, my KPA500 stopped working. It appears, after reviewing the logs, I hit it with 75 watts and probably blew one of the diodes in the front end. I can dig up the explanation if needed. It may have been a case where it took me a while to realize what I was doing. In fact, I can't remember the event other than it was logged by the KPA500. By the way... just having that log available is valuable.
I now have the Flex set to 25 watts max out. 73, Kev K4VD On Thu, Feb 28, 2019 at 4:22 PM Barry Simpson <vk2bj...@gmail.com> wrote: > I have had my KPA500 for around 5 years. I frequently feed through 200w > from my TS990S. > > I have also accidentally abused it many times by putting 100w or more into > it or using the wrong antenna or some such operator error. > > It has always just faulted appropriately and come back up smiling. > > It is a tough little cookie ! > > Barry VK2BJ > > Sent from my iPad > > > On 1 Mar 2019, at 06:12, Bob McGraw K4TAX <rmcg...@blomand.net> wrote: > > > > Yes, improperly or incorrectly using ALC with any amp or any > transceiver, for that matter, can and usually does produce distortion and > splatter. Just look at some of the signals on the bands and observe the > ALC overshoot which exists with many radios. And it is made worse by the > addition of an amplifier in line. It isn't pretty!. Yet it has little > impact on the on frequency signal as heard and thus the "great signal" > complements follow. But look at the other factors where you will find "NOT > so great signal". These points should be addressed as well. > > > > 73 > > > > Bob, K4TAX > > > > > >> On 2/28/2019 1:04 PM, j...@kk9a.com wrote: > >> I have not used ALC with any amplifier since transceivers switched to > transistor finals. From what I have read on this list, using ALC improperly > can cause distortion. Just be very careful with your drive level. I > believe that the KPA500 can handle 100 watts in bypass, 200 watts may be > pushing it. The KPA500 is a very nice amp and it is easy to use with any > transceiver. > >> > >> GL, > >> John KK9A > >> > >> > >> JIM LAGESON N0UR wrote > >> _Thu Feb 28 13:07:27 EST 2019_ > >> > >> > >> ------------------------- > >> > >> I have never owned an amp before and recently put together a KPA500. All > >> seems to be working well, but I have a few questions. I am using with a > >> IC-7300. > >> > >> How important is the ALC cable? I notice it is not included in the Basic > >> Cabling Diagram in the manual but is discussed later in the manual. > >> > >> If I were accidently to run 100 watts into the KPA500 will the PWRIN HI > >> Hard Fault/STBY protect itself before any damage is done. Would ALC > protect > >> me from that? > >> > >> Is it standard procedure to keep the KPA500 in line when turned off and > not > >> in use? I see you may run up to 200 through the KPA500 in STBY. > >> > >> Is there any concerns or settings on radio when running full break in > on CW? > >> > >> Thanks > >> Jim-N0UR > >> ______________________________________________________________ > >> 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 > ______________________________________________________________ > 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
