Stephen,
The pinout for the MD2 microphone is the same as the MH2 and MH4.
Bias requirement is also the same - it needs a 5.6k resistor from the AF
signal (pin 1) and either +5 or +8 volts.
The pinout matches the mic jack wiring which is shown in the K3/K3S
manual on page 13.
Download the K3 manual if you don't have it.
You may also find the microphone pinout at the G4WPW website which has
been preserved at
https://www.qsl.net/g4wpw/date.html#others.
Hint: connect both pin 7 and pin 8 to the common ground.
73,
Don W3FPR
On 4/4/2019 4:11 PM, Stephen Prior wrote:
> I don't know whether anyone can help, but I am trying without any success
> to get the MD2 microphone working with a SunSdr2 transceiver, which is able
> to provide the necessary bias voltage I believe. What I am lacking, and
> have not been able to find online is the original manual for the microphone
> giving pinout and bias details - for I'm sure that there is something that
> I must have missed.
>
> Thanks and 73,
>
> Stephen G4SJP
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