K2 Experience with SM-8 and Heil HM-I Microphones

[Doug Person]

I'm just about complete with KSB2. I'm thinking of setting the K2 up for
either the Icom SM-8 or the Heil HM-I mics.  Looking at the chart on
page18 of the assembly manual - neither are listed.  Does anyone know if
the setup for these mics is the same as the other Icom mics shown in
Table 2?

Doug -- K0DXV
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[Bob Boehmer-2]

Doug -

I just configured my K2 for a Heil HM-iC.

I bought the Heil Kenwood adapter cable for the mic.

On the mic configuration header:
connect  AF to mic pin 1 and install a 5.6K resistor from AF to 5V
connect PTT to mic pin 2
connect GND to mic pins 7 and 8

I left all other mic pins unconnected.

Works great.

73
Bob WB3FXC

On 9/30/07, Doug Person <[hidden email]> wrote:
> I'm just about complete with KSB2. I'm thinking of setting the K2 up for
> either the Icom SM-8 or the Heil HM-I mics.  Looking at the chart on
> page18 of the assembly manual - neither are listed.  Does anyone know if
> the setup for these mics is the same as the other Icom mics shown in
> Table 2?
>
> Doug -- K0DXV
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[Don Wilhelm-4]

Doug,

You must decide how you want to wire the K2's microphone configuration
header.

If you choose the Icom configuration, your Icom SM-8 microphone should
work fine - just plug it in.  If you choose the Heil mic (any of the
Heil mics), order the adapter that matches the way you have the K2
microphone header wired - in other words, if you have the K2 wired for a
Kenwood mic, order the Kenwood adapter, if you have the K2 wired for an
Icom mic, order the Icom adapter, etc.

Whether you need a bias resistor from 5 volts to the AF pin depends on
the mic element.  If it is a dynamic element, no resistor should be
installed, but if it an electret element, you will need the bias resistor.

The two conditions - mic header wiring and the bias resistor are two
separate issues - the wiring (except for the bias resistor) depend on
the mic plug pinout, the bias resistor depends on the mic element type.

Most Heil mics for the Icom (-iC suffix) are electret types.  If you are
not certain, an email to Bob Heil can clarify the element type.  For
element types of the other transceiver manufacturers, your best resource
is to ask the manufacturer of the microphone about the element type - we
can guess, but guesses leave a degree of uncertainty.

73,
Don W3FPR

Doug Person wrote:
> I'm just about complete with KSB2. I'm thinking of setting the K2 up
> for either the Icom SM-8 or the Heil HM-I mics.  Looking at the chart
> on page18 of the assembly manual - neither are listed.  Does anyone
> know if the setup for these mics is the same as the other Icom mics
> shown in Table 2?
>
> Doug -- K0DXV
>
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[oe9fwv]

hi all,

On 30 Sep 2007 at 22:12, Bob Boehmer wrote:

>
> I just configured my K2 for a Heil HM-iC.
>
> I bought the Heil Kenwood adapter cable for the mic.
>
> On the mic configuration header:
> connect  AF to mic pin 1 and install a 5.6K resistor from AF to 5V
> connect PTT to mic pin 2 connect GND to mic pins 7 and 8
>
> I left all other mic pins unconnected.
>
> Works great.

for those who like to change microphones frequently:

I have made microphone configuration plugs with the necessary connections
on the plug. So it is easy to open the cover, change the plug and you are set.
I have installed the EA3BLQ digital PCB, to feed the Pactor modem inside
the K2, but you can also make a computer band cable to the inside of the K2
and mount the plug there. You can see my K2 top cover here:

http://www.qsl.net/oe9fwv/bilder/trxptc_innen_fertig.jpg

The plug can be seen in front of the band cable, PIN 1 marked with a red
wire loop.

73! de Werner
OE9FWV



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