Phil,
The K3 provides bias sourced at 8 volts.
Yes, your homebrew adapter to change the microphone pinout will work
just fine.
Don't worry about the impedance thing. Most all microphones for mdern
amateur gear are of the "low impedance" variety. Now, if you are
considering some of the antique microphones like the original
(unamplified) D-104, they must work into a high impedance (greater than
100k and preferrably 1 megohm) to give good performance. Typical modern
amateur microphones will work into impedances ranging from 1k to 300
ohms with no problem. There are only two impedance ranges to consider -
Hi-Z for antique transceivers driving a vacuum tube grid directly, and
Lo-Z for driving most solid state transceivers - the latter is often
stated to be "600 ohms", but the actual impedance will vary all over
that range.
73,
Don W3FPR
Phil Hystad wrote:
> I like my Icom SM-20 Electret Mic and from what I have learned so far there should be no reason why I cannot adapt this for use with my future (ordering next month) K3.
>
> I don't plan to physically modify the SM-20 but rather create an adapter that accepts the 8-pin plug from the SM-20 and then that would be wired to an 8-pin plug to plug into the K3. I know I would have to wire this adapter to deal with the fact that the pins are not used in the same way for the Icom versus the Kenwood style wiring.
>
> And, I assume that the bias voltage that the mic needs can be supplied by the K3. I have no idea what this is but I presume it is somewhere in the range of 5 to 12 volts.
>
> If this plan has flaws please let me know. Also, I am not sure if the mic impedance would match up with the K3 so if anyone has a comment there I would appreciate it.
>
>
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