Suggest you use one of those amp keyer interfaces for this amp. As an option, also look at the universal keying adapter from HamGadgets.com.
http://www.hamgadgets.com/index.php?main_page=product_info&cPath=21&products_id=128&zenid=r3o0i7qb2ikjcqj299lq3pudb2 73 Greg AB7R On 9/3/13, Vic K2VCO <[email protected]> wrote: > No, the K3 CANNOT switch a negative voltage for keyout! It is a solid-state > circuit which > is quite robust (+200v at 5A), but only for positive DC voltages. > > K3 schematics are here: > > <http://www.elecraft.com/manual/K3_Schematics_Jun_2010.pdf> > > On 8/31/2013 3:52 AM, Doug Basberg wrote: >> Hello; >> >> >> >> I just put together my K3/100 with ATU. What a great transceiver! >> >> >> >> Now I need to hook it to my vintage Collins 30L-1 linear amp. The manual >> says the K3 can handle up to 200 volts on 'key out'. That might mean I >> can >> hook up directly to the linear. One question is whether that also means >> minus 200v. The Collins has -170vdc on its connector. I was thinking >> the >> K3 uses relay contacts for the 'key out', but maybe not. Second question >> is >> whether the K3 schematics are available? >> >> >> >> The powerful configurability of the K3 means I have a learning curve to >> go >> thru. I think this reflector will be a big help. Searching the archives >> will probably solve a lot of questions and then there is the 'live' >> community. Very good. I also subscribed to the yahoo group. >> >> >> >> 73s Doug N8VY >> >> ______________________________________________________________ >> 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 >> > > -- > Vic, K2VCO > Fresno CA > http://www.qsl.net/k2vco/ > ______________________________________________________________ > 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
