> "Unless you are running QSK and need instant keying, I would suggest adding a > small 12v relay inside the K3 that the solid state device keys and presents > the user with a set of dry, isolated contacts that can handle positive, > negative and up to 250v DC or AC."
And bring 250VAC into the case of the K3? If a relay is used instead of a solid-state device, it should be located external to the K3 cabinet, especially with 100-250VAC key lines. The output switching device from the K3 can already switch 200VDC at 5A. For those switching medium-voltage AC/DC amp key lines, or want additional rig-to-amp isolation, a more viable option is to use a solid-state external interface. There are several commercial interfacing products available in both assembled and kit form. My personal favorite is the "KeyAll" from Jackson Harbor Press. It is optically-isolated from the rig and will switch 500 VAC/VDC at 2.5 A loads. http://home.att.net/~jacksonharbor/keyall.htm Paul, W9AC
______________________________________________________________ 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
