Geert,
From your description of the "straight connections" and round plug, I
believe you are referring to the MH4 - the original question was about
the MH3 which has a 1/8 inch TRRS plug and resistors in the microphone
for the buttons.
The MH4 is usable with the K2 and K3, the MH3 is usable with the KX2 and
KX3.
The plastic case for both microphones is the same.
73,
Don W3FPR
On 9/4/2021 6:26 AM, Geert Jan de Groot wrote:
Does anyone know if Elecraft sell replacement cases for this
expensive microphone? I've barely used mine (I'm a CW chap) and it's
already fallen apart! The three plastic internal mounting pillars
have snapped off. I guess it's been dropped, but only on to carpet
and I'm minded to think a $70 mic should easily withstand that.
Last month I emailed Elecraft via their online parts order form, but
not had an acknowledgement. Maybe they're all on summer leave?
Making forms for plastic moulding is extremely expensive and Elecraft
did not make one specially for the MH3.
Looking on ebay, https://www.ebay.com/itm/281509579500 finds a
microphone that uses the same case. The electronics inside is
different (and, frankly, the MH3's innards are a lot nicer than these
ebay microphones) but the casing is the same.
It has a different brand name on the case but that is only a sticker.
You can make these ebay microphones work by changing the wiring a bit,
especially for the down/up buttonw. The radios these are sold for use
resistors on the PTT line to signal up and down, on Elecraft they are
direct connections.
And PTT and audio are on other pins so you need to change that too.
When I have the microphone plug open, I always add a 5K6 resistor
between the 5V and the mic output in the plug. This power the electret
microphone irrespective of "mic bias" settings in the menu. And it
makes the same microphone also usable on the K2 (where the up and down
buttons don't work, alas).
In defense of Elecraft, yes, their microphones are probably "also made
in the east" but there is a difference in quality which will be quite
visible when you compare them. Having said that, an electret
microphone is an electret microphone and the reports on the air are
not different.
And, if the round plug is change for, for instance th Neutrik NTP3RC
(see https://www.neutrik.com/en/product/ntp3rc) then the same
microphone will also work on the KX3. You will need to change the
wiring to make the buttons work but that is not hard.
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