[Elecraft] KX3: CM500 best price/use with

[Bob McGraw K4TAX]

It is a dynamic mike of which is typical of all dynamic mikes that 
exhibit proximity effect.  The closer to the mouth, the more bottom 
end.  It is a mike to mouth distance issue and 1" to 2"  or so makes a 
big difference.

It is not deficient in high end, it has an abundance of low end. If it 
concerns you, attenuate the low end.  Never boost the high end.  You'll 
have better sounding audio.

73

Bob, K4TAX


On 11/11/2017 9:07 PM, Michael Walker wrote:
> 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 
> <mailto: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
>     <mailto:john at kk9a.com>> <john at kk9a.com <mailto: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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