Computer-Headset on K2

[DL9HDA-2]

Hello,

normally I use a Heil Pro-Set with IC-4 and the red Kenwood-adapter for
my K2 and for my K3 , too.  Now I decided to buy a cheaper headset for
my K2 which I do not use very often.

I bought a computer-headset which has a modified connector and it should
be ready for kenwood-rig-operation
(http://www.eurofrequence.de/mikrofone/page2.html ED 5 sw). The
microphone is an electrical one, so I settet the jumper 5 on the
frontpanel of my K2. I didn't solder a 5.6kohm resistor between pin1 and
6 of the connector because I will solder it at the headset-connector and
not on the frontpanel.

If I connect the new headset the K2 freezes and ELEC is shown on the
display. Note: the resisior has not been soldered yet. If I remove the
jumper and conect my Heil Proset it works fine.

Any hints?

73 Holger / DL9HDA
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[Don Wilhelm-4]

Hodger,

It sounds like you have the K2 microphone configuration jumper wired
straight across for all pins - and that is not correct for Kenwood wiring.

You must connect mic pin 5 to the +5 volt line (which is across from pin 6)

If the microphone is wired to work with a Kenwood transceiver, you will
not need an additional bias resistor - it should already be i the
provided adapter.  But then I do not know the real requirements of that
microphone, I am guessing that it works like most Kenwood mics that need
power or bias.

The reason your K2 is acting strangely is because Pin 5 is now connected
to the FUNC line in the K2 by virtue of your mic configuration header.

73,
Don W3FPR

Holger Doerschel wrote:

> Hello,
>
> normally I use a Heil Pro-Set with IC-4 and the red Kenwood-adapter for
> my K2 and for my K3 , too.  Now I decided to buy a cheaper headset for
> my K2 which I do not use very often.
>
> I bought a computer-headset which has a modified connector and it should
> be ready for kenwood-rig-operation
> (http://www.eurofrequence.de/mikrofone/page2.html ED 5 sw). The
> microphone is an electrical one, so I settet the jumper 5 on the
> frontpanel of my K2. I didn't solder a 5.6kohm resistor between pin1 and
> 6 of the connector because I will solder it at the headset-connector and
> not on the frontpanel.
>
> If I connect the new headset the K2 freezes and ELEC is shown on the
> display. Note: the resisior has not been soldered yet. If I remove the
> jumper and conect my Heil Proset it works fine.

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[Brian Lloyd-6]

On Jul 1, 2008, at 8:43 AM, Holger Doerschel wrote:

> If I connect the new headset the K2 freezes and ELEC is shown on the  
> display. Note: the resisior has not been soldered yet. If I remove  
> the jumper and conect my Heil Proset it works fine.

You are probably shorting out the 5V mic bias supply somehow. Since I  
don't know how you have wired your rig internally using the jumper  
blocks, I don't know to which pin you have connected the bias voltage  
(if any).

If you put the jumper blocks straight across, the 5V appears on pin 6.  
In that case you want to put the 5.6K resistor between pins 6 and 1  
(if the mic needs its bias voltage on the mic audio pin).

One thing that certainly makes this a lot easier to deal with is the  
Internal Mic Adaptor from the folks who bring you the un-modules. See:

http://www.unpcbs.com/

It certainly makes it easy to reconfigure the K2 to work with  
different mics.

--

73 de Brian, WB6RQN
Brian Lloyd - brian HYPHEN wb6rqn AT lloyd DOT com



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