After Lyle's comment (reproduced below), there has been been concern expressed about headsets of 120 to 600 ohms. A close reading of Lyle's words indicates that higher impedance is only a problem if there is a need to increase the AF gain too much. As long as you don't have to crank the AF gain way up there shouldn't be a problem.
I think there is also some confusion about what high impedance means. The common WW II aircraft headset came in two versions High Z at 4000 ohms and Low Z at 600 ohms. By that standard 120 ohms is very low and 600 is still low. If your AF gain is at 3 o'clock maybe your earphones or ears have too high an impedance. David K0LUM ------------------------------------------------------------------- Note that the headphone audio path of the K3 is designed for 32-ohm and lower headphone impedances. Higher impedance phones provide less audio for a given transducer efficiency. Cranking up the AF gain to compensate can lead to clipping-related distortion. 73, Lyle KK7P ______________________________________________________________ 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
