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[K2] Mic Configuration

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Joseph Baxley

[K2] Mic Configuration

Hey,

I have a quick question. I finished K2 #7535 last week and it's been working great. I installed the SSB board now and am at the point of configuring the mic. I have an Alinco mic that I want to use and have the diagram for it. I was wondering where to purchase jumper blocks for the configuration connector, or if I am supposed to just jumper them with wires. If possible I'd like to avoid that last one as the blocks like they sell with the MH2 seem much easier to reconfigure if I need to.

Thanks,
Joseph KI4ITG

Jim Wiley

Re: [K2] Mic Configuration

Look for a junk computer, computer motherboard, or computer plug-in
card, such as a sound card or video card, particularly one that is 5 to
10 years old. They typically have several of these jumper blocks that
can be salvaged for this use.

- Jim, KL7CC

On 5/24/2014 7:37 AM, Joseph Baxley via Elecraft wrote:

> Hey,
>
> I have a quick question. I finished K2 #7535 last week and it's been
> working great. I installed the SSB board now and am at the point of
> configuring the mic. I have an Alinco mic that I want to use and have the
> diagram for it. I was wondering where to purchase jumper blocks for the
> configuration connector, or if I am supposed to just jumper them with wires.
> If possible I'd like to avoid that last one as the blocks like they sell
> with the MH2 seem much easier to reconfigure if I need to.
>
> Thanks,
> Joseph KI4ITG
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/K2-Mic-Configuration-tp7589472.html
> Sent from the Elecraft mailing list archive at Nabble.com.
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Gary W. Hvizdak

Re: [K2] Mic Configuration

In reply to this post by Joseph Baxley

About an Hour ago Joseph Baxley, KI4ITG wrote ...

"I installed the SSB board now and am at the point of configuring the mic.
I have an Alinco mic that I want to use and have the diagram for it."

--- - - - ---

Hi Joseph,

Have a look at http://www.unpcbs.com/#rework_eliminator_TM_products
which describes two aftermarket accessories: Rework Eliminator(TM) K2
Option Bypass Headers and Rework Eliminator(TM) K2 Internal Mic Adaptor.
The mic adaptor more-than-dramatically simplifies the task of reconfiguring
the K2 to support any of more than 65 popular amateur radio microphones.

In addition to rewiring the front panel mic connector, it also "inserts"
an external bias resistor when necessary. And best of all, both tasks can
be accomplished by removing your K2's left side panel and rearranging a
half-dozen jumpers!

References:
o http://www.unpcbs.com/adaptor/
o http://www.eham.net/reviews/detail/6918
o http://www.unpcbs.com/headers/
o http://www.eham.net/reviews/detail/6372

73,
Gary KI4GGX
(webmaster)

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Don Wilhelm-4

Re: [K2] Mic Configuration

In reply to this post by Joseph Baxley

Joseph,

Whether you can use those jumpers or not will depend on the wiring of
the microphone plug.
If it has AF on pin 1, PTT on pin 2, and the return paths on pins 7 and
8, then you can use those little computer type jumpers - otherwise you
will have to wire them.
If you need to use wire, one method was presented by Tom Hammond N0SS
(SK) that you can see in the .pdf file on his website at
http://www.mmccs.com/mmarc/n0ss/k2_mic_cfg_hdr.pdf

The jumpers are available from Mouser and several other sources, but you
only need 4 of them unless the mic has up and down buttons, in which
case, you may want 6.
If you can find an older junker computer, the motherboard, modem board,
etc may contain enough of those jumpers for your needs.

73,
Don W3FPR

On 5/24/2014 11:37 AM, Joseph Baxley via Elecraft wrote:

Steve & Anne Ray

Re: [K2] Mic Configuration

In reply to this post by Joseph Baxley

The jumper blocks reminded me of what I did to get the bias voltage out for
the mic. I took a jumper block carefully cut with my Demel Tool through the
short at the top and sweated soldered a SMD 1K resistor across the
terminals. It prevents an accident short of the 5V from the mic and if it
is shorted it only draws 5ma with a 25mW draw on the resistor. A better
choice might be a 10K and that would only draw .5ma and 2.5mW. However, I
have had no problem with the 1K SMD. This was done an experiment to try a
cheap computer mic (which worked fine) I went back to my Heil Mic which I
prefer and does not need bias.

73,

Steve K4JPN

Elecraft K2 S/N 1809

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Steve & Anne Ray

Re: [K2] Mic Configuration

In reply to this post by Joseph Baxley

Checked my notebook, thought I had used a 1K SMD, but I had used a 5K SMD.
The current draw with a short would only be 1mA and the power dissipated
across the 5K SMD would be 5mW.

Earlier I had said.

The jumper blocks reminded me of what I did to get the bias voltage out for
the mic. I took a jumper block carefully cut with my Demel Tool through the
short at the top and sweated soldered a SMD 1K resistor across the
terminals. It prevents an accident short of the 5V from the mic and if it
is shorted it only draws 5ma with a 25mW draw on the resistor. A better
choice might be a 10K and that would only draw .5ma and 2.5mW. However, I
have had no problem with the 1K SMD. This was done an experiment to try a
cheap computer mic (which worked fine) I went back to my Heil Mic which I
prefer and does not need bias.

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