My K3 was seeing similar SWR with an AL811H. It was intermittent and was independent of switch position, standby/operate. The antenna is a SteppIR so SWR was always less than 2:1. With the amp removed the problem is gone. I don't yet know the cause since the amp is in the shop. It seems likely that it's something on the I/O board and my money is on the two small relays. But I'm an appliance operator so who knows?
On Mar 29, 2012, at 7:34 PM, Don Wilhelm <w3...@embarqmail.com> wrote: > Jorge, > > If the K3 does not fault and reduce power, it may be OK - SWR = 2:1 is > the "trip point" for the KPA3 power reduction. > Do check all bands, it could be better (or worse) on some bands as > opposed to others. > > 73, > Don W3FPR > > On 3/29/2012 8:22 PM, Jorge Diez CX6VM wrote: >> Don >> >> The amplifier is a Drake L7 >> >> I will test with a ALS1300 to see what happens >> >> So what do you think? My L7 is doing something bad? >> >> I really dont like to see more than 3 bars in my K3 SWR meter. I tune with >> the internal tuner and is better, but I dont know if I had something bad >> that I need to solve >> >> Thanks >> Jorge >> >> >> Enviado desde mi BlackBerry® device de Antel >> >> -----Original Message----- >> From: Don Wilhelm<w3...@embarqmail.com> >> Sender: elecraft-boun...@mailman.qth.net >> Date: Thu, 29 Mar 2012 19:39:03 >> To: ab2tc<ab...@arrl.net> >> Reply-To: d...@w3fpr.com >> Cc:<elecraft@mailman.qth.net> >> Subject: Re: [Elecraft] K3 - why SWR change with an amplifier >> >> He did not say it was a KPA500! Maybe it was some other amplifier that >> we cannot comment on. >> If it were the KPA500, I would have asked "what bands". >> >> 73, >> Don W3FPR. >> >> On 3/29/2012 7:26 PM, ab2tc wrote: >>> Hi, >>> >>> But is it normal for the KPA500 input SWR to be 2:1? >>> >>> Knut - AB2TC >>> >>> >>> Don Wilhelm-4 wrote >>>> Jorge, >>>> >>>> With the amplifier in standby, the K3 wattmeter sees the antenna SWR - >>>> the same as when the antenna is connected to the K3. >>>> When the amp is switched to operate, the K3 will see the input SWR of >>>> the amplifier - and that has no relationship with the antenna. >>>> >>>> 73, >>>> Don W3FPR >>>> >>>> <snip> >>>> >>> -- >>> View this message in context: >>> http://elecraft.365791.n2.nabble.com/K3-why-SWR-change-with-an-amplifier-tp7419653p7419681.html >>> Sent from the Elecraft mailing list archive at Nabble.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 >>> >> ______________________________________________________________ >> 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
