I use the Koss SB-40 which has a dynamic mike. No bias needed. Bob, K4TAX
Sent from my iPhone > On Nov 11, 2017, at 3:51 PM, <[email protected]> <[email protected]> wrote: > > I was also confused by the posts that the CM500 works best with bias off. > Thanks for explaining why this works only with the KX3/KX2. > > John KK9A > > > Don Wilhelm wrote: > Sat Nov 11 10:23:55 EST 2017 > > Yes, all electret microphones must have bias applied in some manner. > I am not certain why you think this is a KX3 "problem". > The tip and ring connected together is a characteristic of all > microphones intended primarily for computer use - and the Yamaha CM500 > is one of those. The ham microphones normally have a mono plug, and do > not apply, although with mono plugs, MIC BTN must be turned off in the > KX3/KX2 so that PTT is not activated when the mic plug is inserted (the > shell grounds the PTT ring). > The normal computer jack applies bias to the ring, not the tip. > In the KX3, there is residual voltage from the MIC BTN circuit applied > to the ring even with MIC BTN turned off - the combination of the tip > and ring connected together and the residual voltage from the mic button > circuit in the KX3/KX2 is why it works that way. > > That is true of both the KX2 and KX3 - yes, it does not apply to the > K3/K3S which has no connection to the ring contact in the jack. > > So not a "problem", it is just the way things work. > > 73, > Don W3FPR > > ______________________________________________________________ > 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]
