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K3 Rear Panel Microphone Jack Bias Voltage

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Paul Alexander-4

K3 Rear Panel Microphone Jack Bias Voltage

I recently assembled my K3 and am having some trouble getting a
microphone to operate. All of my station microphones are Motorola
handheld microphones. These are dynamic microphones which have a
built-in amplifier, to make them appear as carbon microphones. As
such, they require bias voltage.

My first attempt was to connect the microphone via the rear panel
jack, using the following menu settings:
Mic SEL
rPL.bIAS
and
MIc + LIn
On

Under these settings, I get no bias voltage on the rear panel microphone jack.

When I set Mic SEL for FPL.bIAS, I get bias voltage on the front
panel, and a microphone connected to the front panel connection works
as expected.

FYI, the radio Serial Number is 2925 and the firmware is version 1.98,
MAR 31, 2009.

Is it not possible to get microphone bias voltage on the rear panel
connector? Do I have something set up incorrectly?

Any suggestions would be appreciated.

Thank-you

Paul Alexander
wb9ipa
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Steve Ellington

Re: K3 Rear Panel Microphone Jack Bias Voltage

Paul
If you unplug that mic from the rear panel jack, can you measure any bias
v.? I use a computer mic on the RP with bias set for rP.H BIAS.
Steve Ellington
[hidden email]
----- Original Message -----
From: "paul alexander" <[hidden email]>
To: <[hidden email]>
Sent: Sunday, April 26, 2009 8:54 PM
Subject: [Elecraft] K3 Rear Panel Microphone Jack Bias Voltage

>I recently assembled my K3 and am having some trouble getting a
> microphone to operate. All of my station microphones are Motorola
> handheld microphones. These are dynamic microphones which have a
> built-in amplifier, to make them appear as carbon microphones. As
> such, they require bias voltage.
>
> My first attempt was to connect the microphone via the rear panel
> jack, using the following menu settings:
> Mic SEL
> rPL.bIAS
> and
> MIc + LIn
> On
>
> Under these settings, I get no bias voltage on the rear panel microphone
> jack.
>
> When I set Mic SEL for FPL.bIAS, I get bias voltage on the front
> panel, and a microphone connected to the front panel connection works
> as expected.
>
> FYI, the radio Serial Number is 2925 and the firmware is version 1.98,
> MAR 31, 2009.
>
> Is it not possible to get microphone bias voltage on the rear panel
> connector? Do I have something set up incorrectly?
>
> Any suggestions would be appreciated.
>
> Thank-you
>
> Paul Alexander
> wb9ipa
> ______________________________________________________________
> 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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Paul Alexander-4

Re: K3 Rear Panel Microphone Jack Bias Voltage

Steve--

I tried just inserting a bare plug into the jack, with no microphone
wires attached and measured no bias voltage on the rear jack. One of
my first thoughts was that the microphone had a short in it, but, that
was not the case.

Thanks for the suggestion.

Paul Alexander
wb9ipa

On Sun, Apr 26, 2009 at 9:11 PM, Steve Ellington <[hidden email]> wrote:

> Paul
> If you unplug that mic from the rear panel jack, can you measure any bias
> v.? I use a computer mic on the RP with bias set for rP.H BIAS.
> Steve Ellington
> [hidden email]
> ----- Original Message ----- From: "paul alexander" <[hidden email]>
> To: <[hidden email]>
> Sent: Sunday, April 26, 2009 8:54 PM
> Subject: [Elecraft] K3 Rear Panel Microphone Jack Bias Voltage
>
>
>> I recently assembled my K3 and am having some trouble getting a
>> microphone to operate. All of my station microphones are Motorola
>> handheld microphones. These are dynamic microphones which have a
>> built-in amplifier, to make them appear as carbon microphones. As
>> such, they require bias voltage.
>>
>> My first attempt was to connect the microphone via the rear panel
>> jack, using the following menu settings:
>> Mic SEL
>> rPL.bIAS
>> and
>> MIc + LIn
>> On
>>
>> Under these settings, I get no bias voltage on the rear panel microphone
>> jack.
>>
>> When I set Mic SEL for FPL.bIAS, I get bias voltage on the front
>> panel, and a microphone connected to the front panel connection works
>> as expected.
>>
>> FYI, the radio Serial Number is 2925 and the firmware is version 1.98,
>> MAR 31, 2009.
>>
>> Is it not possible to get microphone bias voltage on the rear panel
>> connector? Do I have something set up incorrectly?
>>
>> Any suggestions would be appreciated.
>>
>> Thank-you
>>
>> Paul Alexander
>> wb9ipa
>> ______________________________________________________________
>> 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
>
>

Cady, Fred

Re: K3 Rear Panel Microphone Jack Bias Voltage

Note that the Bias (+8 v) appears on the tip, not the ring, of the rear
panel jack.
73,
KE7X

Fred Cady
fcady at ieee dot org

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of paul alexander
> Sent: Monday, April 27, 2009 4:57 AM
> To: Steve Ellington
> Cc: [hidden email]
> Subject: Re: [Elecraft] K3 Rear Panel Microphone Jack Bias Voltage
>
> Steve--
>
> I tried just inserting a bare plug into the jack, with no microphone
> wires attached and measured no bias voltage on the rear jack. One of
> my first thoughts was that the microphone had a short in it, but, that
> was not the case.
>
> Thanks for the suggestion.
>
> Paul Alexander
> wb9ipa

This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail.
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Paul Alexander-4

Re: K3 Rear Panel Microphone Jack Bias Voltage

Fred--

That thought also occurred to me at the time. Bias voltage appears on
neither tip to sleeve or ring to sleeve.

Thanks.

Paul
wb9ipa

On Mon, Apr 27, 2009 at 10:49 AM, Cady, Fred <[hidden email]> wrote:

> Note that the Bias (+8 v) appears on the tip, not the ring, of the rear
> panel jack.
> 73,
> KE7X
>
> Fred Cady
> fcady at ieee dot org
>
>> -----Original Message-----
>> From: [hidden email]
>> [mailto:[hidden email]] On Behalf Of paul alexander
>> Sent: Monday, April 27, 2009 4:57 AM
>> To: Steve Ellington
>> Cc: [hidden email]
>> Subject: Re: [Elecraft] K3 Rear Panel Microphone Jack Bias Voltage
>>
>> Steve--
>>
>> I tried just inserting a bare plug into the jack, with no microphone
>> wires attached and measured no bias voltage on the rear jack. One of
>> my first thoughts was that the microphone had a short in it, but, that
>> was not the case.
>>
>> Thanks for the suggestion.
>>
>> Paul Alexander
>> wb9ipa
> This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail.
>

KK7P

Re: K3 Rear Panel Microphone Jack Bias Voltage

If you are not measuring the rear mic jack bias voltage when the bias is
switched on, then there is likely an issue with your KIO3 or the
daughterboard with the audio jacks. Please contact [hidden email].

73,

Lyle KK7P

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Paul Alexander-4

Re: K3 Rear Panel Microphone Jack Bias Voltage

Lyle--

Good advice; I will follow it. I wanted to confirm that my settings
were correct before contacting support.

Thanks.

Paul Alexander
wb9ipa

On Mon, Apr 27, 2009 at 11:14 AM, Lyle Johnson <[hidden email]> wrote:
> If you are not measuring the rear mic jack bias voltage when the bias is
> switched on, then there is likely an issue with your KIO3 or the
> daughterboard with the audio jacks. Please contact [hidden email].
>
> 73,
>
> Lyle KK7P
>
>
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