[Elecraft] KX3: CM500 best price/use with

[ab2tc]

Hi,

This thread had me thoroughly confused for a while, but I now realize that
it applies to the KX3 and KX3 *only*. It does *not* apply to the K3 which
*must* have bias turned on to use any Electret microphone, whether by Heil,
Yamaha or Koss. In the K3 the ring on the microphone socket is *floating*
and can obviously not by used for an alternate source of bias. I verified
that the Yamaha and Koss both have the tip and ring connected together. The
Heil comes with a mono (TS) plug. All of this is compatible with the K3 if
the bias is turned on. I am not sure what's up with the KX3 and the
"cleaner" audio achieved with the bias turned off. It seems to me that this
is not a choice that users should have to make. Until I saw this thread, as
far as I know the advice was to always (for both the K3 and the KX3) turn
bias on to use any Electret microphone

AB2TC - Knut


Don Wilhelm wrote
> Ed,
> 
> You can use the stereo mic connector directly into the KX3 if you turn 
> MIC BTN off in the menu.  You should also turn off MIC BIAS which 
> results in a cleaner signal - the mic then gets its bias from the LOGIC 
> residual voltage that is normally applied to the ring.
> 
> You can use the XMIT button to initiate transmit, or use VOX.
> That may be inadequate for your purposes since you need to activate PTT 
> from your sequencer.  The only alternative is to build a special cable 
> or as has been suggested several times on this reflector, use an adapter 
> with a stereo male plug and one jack that connects to the ring and 
> another to the tip.  You might search the archives to see some of the 
> sources and part numbers.  If you use an adapter like that, you do not 
> have to turn off MIC BTN and MIC BIAS.
> The stereo plug does connect the LOGIC ground and the Signal ground 
> together, but no apparent harm has been mentioned because of that.
> 
> 73,
> Don W3FPR
> <snip>





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