> Anything I need to know before I hook the K3 up to it.
Don't do it! The TL-922 has a high voltage PTT line with *no* current limiting and no reverse EMF diode across the relay coils. The relay current is rather high and the "spike" when releasing PTT is quite high. You will need to add a Harbach engineering "soft key" board - www.harbachelectronics.com/main/page_products_kenwood_tl922a.html - in order to keep from blowing the K3's keying FET and potentially causing other damage to the K3 due to the spike. Even if you add the soft key board, I would recommend adding "back diodes" across the T/R relay coils and adding a series resistor in the relay line to keep the current down and minimize the potential for a spike. 73, ... Joe, W4TV On 9/2/2011 8:57 PM, Chris Hembree wrote: > I am buying a Kenwood TL-922A Amp. Anything I need to know before I hook the > K3 up to it. > > Thanks > Chris W7CTH > ______________________________________________________________ > 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 > ______________________________________________________________ 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