John, If you are an experienced builder, you can build the KX1 with consideration for the addition of the KXB3080 option - if and only if you order the KXB3080 at the same time as the KX1 (you will need some of the components).
If you cannot order the KXB3080 until later, just mount L6 on the bottom of the board rather than the top so you do not have to change it later. If you have the KXB3080 kit available while building the KX1, you can avoid de-soldering components by following the instructions below: The procedure is as follows: Build the KX1 as indicated in the manual up through page 30 of the KX1 manual. On page 31, install L6 on the bottom of the board rather than on the top. Do not install L7 on page 31. Do not install C27 (page 32) Do not install C1 on page 33. Do not install C26 (page 33). Continue with the KX1 manual steps. Then from the KXB3080 instructions, install C1, C26 and T2 - be sure to make the PC trace cut indicated on page 5 (figure 2), and connect the end of the 40 meter trimmer capacitor to the cut trace as indicated. You should then have a KX1 that works on 40 and 20 meters - test it on those bands. Then add the KXB3080 board as indicated in the KXB3080 manual, and again test the KX1 on 40 and 20 meters. Lastly (and most carefully), build the Low Pass Filter board for the KXB3080. Follow the manual diagrams explicitly, work carefully, and make it look just like the diagrams - this is the most common failure point for builders. Then activate b30 and b80 in the menu, and you should have operation on all 4 bands. Good luck with the build process. Use care when building the KX1 - because of its density, it is one of the more difficult Elecraft kits. Follow the instructions explicitly, use good soldering techniques and you should have success. If you do not understand any step in the instructions, ask here on the reflector and you should receive clarification. 73, Don W3FPR On 5/4/2011 10:12 PM, John wrote: > Hello all, > > I am combining some gift cash plus the proceeds from the sale of a radio > and have enough to finally order my very own KX1 CW QRP transceiver kit. > > For the moment, the base radio is the only thing I can purchase. I > eventually will add the 3080, antenna tuner and the nifty key. > > I recall some folks with the K2 suggest procuring the desired options > ahead of time to avoid reworking portions of the circuitry during a > later retrofit. > > Does the KX1's design lend itself to add the 3080 and tuner options > later with little rework? > > Anyone have any other advice to give before I plunge into building the > base KX1 rig? > > I already know about pre-wound toroids, but enjoy doing those myself. > > Thanks. > > John > ______________________________________________________________ > 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
