I've been thinking about how one might go about adding some protection for the apparently fragile (and expensive) RS-232 port on the K3. It might be possible, if the components were small enough, to add them on the KIO3 I/O daughterboard, or perhaps on a little external board mounted at the port.
But the question is, what components? I have seen small gas tube units, but suspect that by the time the potential reaches 90 volts or so and the tube flashes over, the RS-232 transceiver is probably toast anyway. Would it be feasible to use fast diodes to shunt the data lines to ground at .7 volts or so, or would that introduce other problems (stray capacitance, etc.)? Anything else that might make sense? -- 73, Pete N4ZR The World Contest Station Database, updated daily at www.conteststations.com The Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com, spots at telnet.reversebeacon.net, port 7000 ______________________________________________________________ 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
