The issue with these older amps is that the keying voltage is negative, which doesn't work with the solid-state output in the K3.
>From practical experience, a FL2100B will NOT work when connected directly to the K3 - you need an interface of some sort. ~Iain / N6ML On Thu, Aug 19, 2010 at 6:18 PM, Tom Boucher <t...@telemetry.demon.co.uk> wrote: > Chuck, > > I don't think you're right - the K3 'Key Out' is spec'd 200V @ 5A. The FL2100 > 'RY' relay control switches 12V @ 200mA only. > > 73 > Tom G3OLB > > AE4CW wrote: >>However, you will need an interface to key the amp from the K3 as the amp >>keying voltage is not compatible with the K3. I used a simple 12V reed >>relay powered from the K3 12V RCA jack. > > ______________________________________________________________ > 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