[ICOM] Mic wiring required HM-14

[Gary Fiber]

They are wired the same. The HM-14 will connect up to and work fine with 
your IC-751. Basically its an HM-12 or HM-36 with a DTMF chip and keypad 
installed.
  I can't remember if the HM-14 has a wire from the 8 volts pin for the 
DTMF chip inside. I don't think so, seem to remember being surprised there 
was not one there. Why Icom choose green for the PTT ground I'll never know 
as generally Black is DC ground at least here in the US for most items.

Pin 2 on the round connectors generally has 8 volts DC but it is not always 
used by external accessories like mics.

Any way the wiring should almost fall into place as a few wires can be 
sorted out with an ohmmeter. If you open the back of the mic you will 
likely be able to sort the rest with the ohmmeter.

Gary K8IZ

Gary Fiber wrote:

> > If I am wrong others here will correct me.
> >
> > White - Pin 1 Mic Audio
> > Black - Pin 3 Freq UP / Down
> > Red    - Pin 5 PTT
> > Green - Pin 6 Ground
> > Shield - Pin 7 Mic audio ground
> >
> > Pins 2 ( 8 volts ), 4 ( squelch Switch ) ,and 8 ( Receiver Audio ) are
> > empty on the HM-14 mic connector.
> >
> > Gary K8IZ
>
>Hi Gary
>
>Many thanks for the reply. Looks like I fell into that old trap of I assumed.
>I assumed the 8 volts was on pin 2 like it is on my IC-751. I was hoping
>that ICOM mics were wired the same, no matter if they were HF or VHF.
>Will wire it up as you suggested and give it a try.
>
>What can I loose, it's not my mic.    heh heh heh
>
>7 3
>Reed