Hi Pete, I will look around U1 on the KIO3A! Never had an RS232 failure since >30y and never disconnect them when not in use... only when connecting an other device... I always thought it was a "relatively" robust interface!
Thanks for info! 73 QRO, Rudolf, HB9ARI (K3 #1212) Pete Smith wrote: > Don, I have read several reports on this list of RS-232 failures > (probably implicating U1 on the KIO3A) apparently due to induced > voltage. My comment was based more on my having used radios with serial > ports for some 15 years and never had any problem with the ports, > despite leaving serial cables connected all the time. Elecraft advised > me always to disconnect any cable from the RS-232 port on my K3 when not > in use, from which I inferred fragility. > > Anyway, the point is that I'm ready to add some protection, if I can > figure out how to do it. > > 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 > > > On 7/18/2010 10:31 PM, Don Wilhelm wrote: > >> Pete, >> >> I am not certain why you believe the K3 RS-232 port to be "fragile". >> I have not seen a large number of failures identified on this reflector. >> There have been quite a number of users who have had problems with USB >> to RS-232 adapters, but that is not a failure of the K3 RS-232 port. >> >> Can you give me some examples of RS-232 port failures on the K3? >> >> 73, >> Don W3FPR >> >> Pete Smith wrote: >> >>> 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? >>> >>> >> > ______________________________________________________________ > 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 > > ______________________________________________________________ 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
