I thought that the discussion was about the subject Yamaha CM500. I do not own this headset however I thought that it had an electret mic even though it was advertised as dynamic. Either way this was good information by W3FPR. I have a K3S and an electret mic so I keep my bias on.
John KK9A -----Original Message----- From: Bob McGraw K4TAX [mailto:[email protected]] Sent: Saturday, November 11, 2017 5:33 PM To: [email protected] Cc: [email protected] Subject: Re: [Elecraft] KX3: CM500 best price/use with 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]
