Steve KC8QVO wrote
> 
>  I do not believe the mic needs any power, but I could be wrong. 
> 

When connected to the FT-8x7 radios, one of the wires carries +5V but the
mic element itself does not use it.

I use an MH-31 coupled with a DYC-8x7 processor/preamp dongle 
(http://www.box73.de/product_info.php?products_id=945).  I suspect the
output is significantly higher than with the MH-31 alone.  I'm hopeful that
it will be usable with the KX-3.

73,
Barry N1EU




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