Rudi, Take a look at the W3FPR Fixed Audio Output that can be found on Tom Hammond's website www.n0ss.net. Unfortunately, Tom no longer offers the boards but has offered to provide the PC board data to anyone who wants it. You could easily wire the circuit on a piece of perfboard. That takes care of the output (without isolation transformers), but you are on your own for the input side. If you have no need for switching between digital input and a microphone, there is nothing wrong with putting a resistive attenuator on the Mic AF line inside the K2 - you can easily break the line at the microphone configuration header and add a couple resistors at that point.
If you use RTS or DTR from the serial port for PTT, you will certainly have to place the one transistor interface (or optoisolator) for that outside the K2. I guess one could butcher the KIO2 or AUX I/O internal K2 signal lines on the KPA100, but that would make it unusable fo connecting an external Elecraft device like the KAT100, the XV series transverters or the KRC2, and I would not recommend doing that. Any isolation transformers may have to live outside the K2 if it is a K2/100 - there is just not room inside. In the K2/10 you might find room for the transformers, but that depends on the particular options you have installed. You may not need the transformers if you follow the guidelines offered by Jim Brown W9YC - see http://haminterfacing.pdf for more information. 73, Don W3FPR Rudi wrote: > Hello FM, > > I would like to do some digi modes with my K2. > > I don't like external interface and would like to install something inside > the K2. > > I saw on internet a board from en EA station, but it seems that this is not > availiable anymore. > > All info is welcome. > > Best 73 - Rudi - ON7CL / KB8TAB > ______________________________________________________________ > 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 > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 9.0.791 / Virus Database: 271.1.1/2758 - Release Date: 03/19/10 > 18:07:00 > > ______________________________________________________________ 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
