> If that voltage is for certain positive, the answer is yes, the K3 > will switch it, but if it is negative, connect your other relay.
The problem is that many "high voltage" amplifiers have significant relay current and no current limiting or reverse EMF ('catch") diode and often exhibit a large *negative* spike when the relay opens. An external relay or a "buffer" like Ampkeyer, Ameritron ARB-704, WB9KZY "Keyall", etc. is a good insurance policy. A relay or buffer is required with any negative voltage (SB-200, FL-2100, FL-2100B, etc.) key lines. 73, ... Joe, W4TV On 3/15/2012 2:07 PM, Don Wilhelm wrote: > Bob, > > If that voltage is for certain positive, the answer is yes, the K3 will > switch it, but if it is negative, connect your other relay. > > 73, > Don W3FPR > > On 3/15/2012 1:12 PM, riese-k3...@juno.com wrote: >> Gang >> >> the heath series of amps use bial voltage to switch the thing from T/R >> and That amounts to 130 +- volts >> would the K3 be Ok switching this or should I look to add an additional >> relay >> and switch that >> >> Bob K3DJC >> ______________________________________________________________ >> 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 > ______________________________________________________________ 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