I use the KXPA100+KXAT100 built in tuner with my K2, and it works great. Of course, the integration isn't quite as tight as it is with the KPA100+KAT100. For example, when I change bands, I need to hit the "dit" paddle to give the amp/tuner a squirt of RF and let it know my new QRG. But the tuner immediately selects the right antenna and recalls the last tuning solution for that band segment. I also set the power knob to 3W when doing a tuning cycle, and then maybe crank it up to 5W if I want a full 100W out of the amp.
In order to make the amp work the the K2, you need a key out line. The basic K2 doesn't have this, but it is easy to add one. Here is what I did, based on an article from the Elecraft website: http://www.mwrs.org.au/2014/04/20/elecraft-k2-amplifier-keying-circuit/ The benefit of using KXPA100 solution is that I can leave it at home if I want to take my K2+built in QRP ATU out into the field, or I can bring it along. I can also use the KXPA100 with my KX3, in which case it is a fully integrated solution. The KXPA100 is completely silent, with no fans, and relays only used for antenna selection/tuning/protection, whereas I understand the KPA100 has some noisy fans when it warms up. Whichever way you go, the K2 is a lot of fun :-) 73, Matt VK2RQ > On 16 Nov 2014, at 6:33 am, Ken Miller <k6...@earthlink.net> wrote: > > All, > > Have updated the firmware and put in the keying mods on my K2. Also had > a friend with some great test equipment verify that the new keyinh > waveform is as it should be to prevent key clicks when using an amp. > > Now the dilemma. Torn between the K2/100 amp, and maybe a KAT100 in a > separate EC2 case or a KXPA100. > > I'd like to hear comments from those that have used the KXP100 with or > without the tuner to amplify a K2. > > Are there any special considerations that need to be taken into account > when using the KXPA100? > > How easy is it to add the tuner later to the KXPA100? > > Thanks in advance for any/all comments. > > 73 - Ken Miller, K6CTW K2 # 455 > > > > > ______________________________________________________________ > 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 > Message delivered to matt.vk...@gmail.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 Message delivered to arch...@mail-archive.com
