Jim, Since the K2 has a positive key voltage, an NPN transistor is necessary. (eg 2N2222, 2N3904, etc) Alternatively, one could use an enhancement-mode N-channel FET (eg 2N7000, etc).
> On Dec 7, 2021, at 5:25 PM, Jim Brown <j...@audiosystemsgroup.com> wrote: > > On 12/7/2021 1:13 PM, eda...@aya.yale.edu wrote: >> Can it be done with just the K2/KIO2, a KUSB cable, and an ordinary > > Remember that the DB9 connector on a K2 is NOT a standard RS232 connector. > Study the manual. To send CW via the computer serial port, a "level shifter" > is needed. It's been a while, but I think I remember DTR driving a generic > PNP with 5K in series with the base, and the collector to the K2 key input, > emitter to keying return. Someone will correct me if I'm wrong. > > 73, Jim K9YC > ______________________________________________________________ > 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 > Message delivered to aa...@arrl.net Bill Coleman, AA4LR, PP-ASEL Mail: aa...@arrl.net Web: http://boringhamradiopart.blogspot.com Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
