The KX3 “PHONES” jack is for headphones. It produces 100 mW. —wunder, K6WRU
> On Feb 16, 2026, at 3:44 PM, Jim Brown via Elecraft > <[email protected]> wrote: > > On 2/16/2026 3:15 PM, Phil Hystad via Elecraft wrote: >> Can someone give pointers on this? > > The K3, K3S, and K4 have separate audio power amplifiers for headphones and > speakers, each with their own individual output jacks. I haven't studied the > schematic, but I suspect that the KX3 has only the amplifiers for headphones. > Speakers require considerably more power. > > The headphone output could probably drive a powered speaker (that is, one > with its own built-in amplifier), but powered speakers are notoriously bad > for RFI, both generating noise and being susceptible to nearby transmitters, > so are unlikely to be a solution. > > 73, Jim K9YC > ______________________________________________________________ > 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] ______________________________________________________________ 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]
