Pete, I think you have misunderstood the purpose of the Key Out jack on the K3. It does not provide 12 volts out at 40 ma. It is a keying circuit that can withstand a external keying circuit up to +200 volts DC and can handle a keying load of up to 5 amps. (See the K3 manual regarding the Rear Panel) If you want to key your external relay, you will need to provide a source of power for the relay - and use the Key Out connection as the "switch" for it.
Jim - W4RKS -------------------------- >I am trying to use the Key Out jack on my K3 to key a small relay to >protect my SDR from RF. The 12V at 40 ><http://mailman.qth.net/mailman/listinfo/elecraft> ma is well within the >stated rating >of the jack, but to my surprise it does not work. Measuring with an >analog multimeter, the jack appears to be shorted all the time, and also >to have a very small DC voltage on it. I don't have a schematic for the >radio, so I'm stumped. Is this a function of the way I'm measuring, or...? -- >73, Pete N4ZR ______________________________________________________________ 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 Message delivered to [email protected]
