Juan
You will also have to have a logging program running to poll the radio for frequency as the cable to the sd100 only has the receive line. This prevents "collisions" at the rs232 port. 73 Larry K1ZW Juan: The SteppIR picture here shows the connections: http://test.steppir.com/wp-content/uploads/2011/10/Y-Cable.pdf The KPA500 ports are not used for frequency information to the SteppIR. They're used for firmware load of the KPA500, KPA500 operation, and for frequency control with a Kenwood radio. 73 de Dick, K6KR ______________________________________________________________ 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