Knut,
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
On 11/11/2017 9:12 AM, ab2tc wrote:
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.
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
