The link I provided below for Jim Brown's HamInterfacing document is incomplete (Blame Jim, I copied it from one of his posts :-) ). Use http://audiosystemsgroup.com/HamInterfacing.pdf instead.
73, Don W3FPR Don Wilhelm wrote: > 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, > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
