Elecraft

CM500

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Chester Alderman

CM500

SOMEWHERE in my pile of papers I have a CM500 headset owners paper!
Can someone please tell me what the tip and ring connection are for the
microphone? I assume the base is the ground connection.
Thanks.
Tom - W4BQF

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Jim Brown-10

Re: CM500

On 1/13/2011 8:24 AM, Tommy Alderman wrote:
> SOMEWHERE in my pile of papers I have a CM500 headset owners paper!
> Can someone please tell me what the tip and ring connection are for the
> microphone? I assume the base is the ground connection.

Audio appears between tip and shell. As nearly as I have been able to
determine, the ring contact is not used at all. Tip also needs a
resistor (about 5K ohms) to V+. Turning on bias in the K3 does this
internally, so no resistor is needed. I had to add the resistor in an
adapter that I built to use with an FT1000MP at PJ4. The bias resistor
is also built into the mic input of most modern computer sound cards.
The CM500 works just fine in my Thinkpads.

73, Jim K9YC
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Mark n2qt

Re: CM500

nice write up on sound card microphones (like in the CM500) at

http://www.hobby-hour.com/electronics/computer_microphone.php

My CM500 just came today, haven't confirmed anything yet.

Mark n2qt

-----Original Message-----
From: Jim Brown
Sent: Thursday, January 13, 2011 1:37 PM
To: [hidden email]
Subject: Re: [Elecraft] CM500

On 1/13/2011 8:24 AM, Tommy Alderman wrote:
> SOMEWHERE in my pile of papers I have a CM500 headset owners paper!
> Can someone please tell me what the tip and ring connection are for the
> microphone? I assume the base is the ground connection.

Audio appears between tip and shell. As nearly as I have been able to
determine, the ring contact is not used at all. Tip also needs a
resistor (about 5K ohms) to V+. Turning on bias in the K3 does this
internally, so no resistor is needed. I had to add the resistor in an
adapter that I built to use with an FT1000MP at PJ4. The bias resistor
is also built into the mic input of most modern computer sound cards.
The CM500 works just fine in my Thinkpads.

73, Jim K9YC
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GARY-2

Re: CM500

In reply to this post by Chester Alderman

Tom,
I recently bought a CM500 new and it did not include any papers at all however the headset's wiring reflects a standard used in computer sound cards. The mic jack/plug is usually wired as follows;
tip- mic signal
ring- bias voltage (optional)
sleeve- ground

Hope this helps.
Gary
N6LRV
---- Tommy Alderman <[hidden email]> wrote:
> SOMEWHERE in my pile of papers I have a CM500 headset owners paper!
> Can someone please tell me what the tip and ring connection are for the
> microphone? I assume the base is the ground connection.
> Thanks.
> Tom - W4BQF
>

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Chester Alderman

Re: CM500

In reply to this post by Chester Alderman

Thanks for the several responses. They were all helpful.

73,
Tom - W4BQF

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Tommy Alderman
Sent: Thursday, January 13, 2011 11:25 AM
To: [hidden email]
Subject: [Elecraft] CM500

SOMEWHERE in my pile of papers I have a CM500 headset owners paper!
Can someone please tell me what the tip and ring connection are for the
microphone? I assume the base is the ground connection.
Thanks.
Tom - W4BQF

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k.igor

Re: CM500

In reply to this post by GARY-2

I just checked my CM500. It appears that tip and ring are shorted together.
73,
Igor, N1YX

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of [hidden email]
Sent: Thursday, January 13, 2011 3:20 PM
To: Tommy Alderman; [hidden email]
Subject: Re: [Elecraft] CM500

Tom,
I recently bought a CM500 new and it did not include any papers at all
however the headset's wiring reflects a standard used in computer sound
cards. The mic jack/plug is usually wired as follows;
tip- mic signal
ring- bias voltage (optional)
sleeve- ground

Hope this helps.
Gary
N6LRV
---- Tommy Alderman <[hidden email]> wrote:
> SOMEWHERE in my pile of papers I have a CM500 headset owners paper!
> Can someone please tell me what the tip and ring connection are for the
> microphone? I assume the base is the ground connection.
> Thanks.
> Tom - W4BQF
>

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Don Wilhelm-4

Re: CM500

Al the more reason to use only the tip and the sleeve.
The K3 jacks are 'stereo', which indicates that a stereo cable will work
just fine and cause no additional problems. Since the K3 does not use
the ring contact, it makes no difference whether the tip and ring are
connected or not - the K3 ignores the ring contact.

I am not certain about your situation, but as I understand,in the case
of the CM500, the tip is the active AF signal, and the shell is the
return (ground). The mono input of the K3 rear panel mic jack will work
just fine as long as bias is turned on. If the front panel mic input is
the choice, an adapter to a Foster plug is required and bias will have
to be turned on.

73,
Don W3FPR

On 1/13/2011 8:57 PM, Igor Kosvin wrote:

> I just checked my CM500. It appears that tip and ring are shorted together.
> 73,
> Igor, N1YX
>
> -----Original Message-----
> From:[hidden email]
> [mailto:[hidden email]] On Behalf [hidden email]
> Sent: Thursday, January 13, 2011 3:20 PM
> To: Tommy Alderman;[hidden email]
> Subject: Re: [Elecraft] CM500
>
> Tom,
> I recently bought a CM500 new and it did not include any papers at all
> however the headset's wiring reflects a standard used in computer sound
> cards. The mic jack/plug is usually wired as follows;
> tip- mic signal
> ring- bias voltage (optional)
> sleeve- ground
>
> Hope this helps.
> Gary
> N6LRV
> ---- Tommy Alderman<[hidden email]> wrote:
>> SOMEWHERE in my pile of papers I have a CM500 headset owners paper!
>> Can someone please tell me what the tip and ring connection are for the
>> microphone? I assume the base is the ground connection.
>> Thanks.
>> Tom - W4BQF
>>
> ______________________________________________________________
> Elecraft mailing list
> Home:http://mailman.qth.net/mailman/listinfo/elecraft
> Help:http://mailman.qth.net/mmfaq.htm
> Post:mailto:[hidden email]
>
> This list hosted by:http://www.qsl.net
> Please help support this email list:http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Elecraft mailing list
> Home:http://mailman.qth.net/mailman/listinfo/elecraft
> Help:http://mailman.qth.net/mmfaq.htm
> Post:mailto:[hidden email]
>
> This list hosted by:http://www.qsl.net
> Please help support this email list:http://www.qsl.net/donate.html
>

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Don Wilhelm-4

Re: CM500

In reply to this post by k.igor

Al the more reason to use only the tip and the sleeve.
The K3 jacks are 'stereo', which indicates that a stereo cable will work
just fine and cause no additional problems.

I am not certain about your situation, I as I understand,m ln/

On 1/13/2011 8:57 PM, Igor Kosvin wrote:

> I just checked my CM500. It appears that tip and ring are shorted together.
> 73,
> Igor, N1YX
>
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of [hidden email]
> Sent: Thursday, January 13, 2011 3:20 PM
> To: Tommy Alderman; [hidden email]
> Subject: Re: [Elecraft] CM500
>
> Tom,
> I recently bought a CM500 new and it did not include any papers at all
> however the headset's wiring reflects a standard used in computer sound
> cards. The mic jack/plug is usually wired as follows;
> tip- mic signal
> ring- bias voltage (optional)
> sleeve- ground
>
> Hope this helps.
> Gary
> N6LRV
> ---- Tommy Alderman<[hidden email]> wrote:
>> SOMEWHERE in my pile of papers I have a CM500 headset owners paper!
>> Can someone please tell me what the tip and ring connection are for the
>> microphone? I assume the base is the ground connection.
>> Thanks.
>> Tom - W4BQF
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

GARY-2

Re: CM500

In reply to this post by k.igor

Igor,
That is normal for an electret mic like the one used in the CM500 headset.
Gary
N6LRV

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Igor Kosvin
Sent: Thursday, January 13, 2011 5:57 PM
To: [hidden email]
Subject: Re: [Elecraft] CM500

I just checked my CM500. It appears that tip and ring are shorted together.
73,
Igor, N1YX

______________________________________________________________
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