The AL-811 manual states that "Relay: keys amplifier when grounded. Sources +12 VDC open circuit and supplies 100mA when grounded. A built-in pulse canceling diode protects the exciter. "
The K3 is pretty robust "KEY OUT (RCA/Phono) is the amplifier T-R relay keying output, capable of keying up to +200VDC @ 5A." The relay coils back emf is contained by the diode across it. So, no issues switching the AL-811. 5A's and 200Vdc withstand voltage, beats 100ma and an applied 12Vdc source all day long. 73 -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-and-AL-811-amplifier-interfacing-tp7561650p7562241.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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
