[Elecraft] KX3: CM500 best price/use with

[Michael Walker]

I have used the Koss SB40 as well, but I think you will find there is no
high end on the Mic and you really have to do some EQ work to make it sound
normal.

73, mike va3mw

On Sat, Nov 11, 2017 at 5:32 PM, Bob McGraw K4TAX <rmcgraw at blomand.net>
wrote:

> 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, <john at kk9a.com> <john at kk9a.com> 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
> >
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