Elecraft

K3 DTMF tones

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David Pratt-2

K3 DTMF tones

In an archived message Lyle KK7P said .....

> Currently, use of a DTMF-equipped microphone or generating the tones
> with an attached device. The K3 does not generate DTMF tones,although
> it could in a future firmware enhancement.
>
> 73,
>
> Lyle KK7P

Well, in the absence of the long awaited DTMF software enhancement for
the K3 I have at last bought myself a Kenwood microphone, fitted with
an 8-pin plug that mates with the K3. But I have had no success in
getting the DTMF feature to work :-(

As the Kenwood mic is electret I have switched bias on with MIC SEL
although, surprisingly, the microphone seems to work equally well with
it switched off!

Does anyone know how to get the Kenwood DTMF mic to work with the K3?

73 de David G4DMP

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Don Wilhelm

Re: K3 DTMF tones

David,

Are you certain the Kenwood mic is electret? Most are dynamic. Make
certain the mic plug is wired for standard Kenwood pinout for HF mics,
Some made for VHF rigs may be different.

73,
Don W3FPR

On 2/7/2018 9:47 AM, David Pratt wrote:

> In an archived message Lyle KK7P said .....
>
>> Currently, use of a DTMF-equipped microphone or generating the tones
>> with an attached device. The K3 does not generate DTMF tones,although
>> it could in a future firmware enhancement.
>>
>> 73,
>>
>> Lyle KK7P
>
> Well, in the absence of the long awaited DTMF software enhancement for
> the K3 I have at last bought myself a Kenwood microphone, fitted with
> an 8-pin plug that mates with the K3. But I have had no success in
> getting the DTMF feature to work :-(
>
> As the Kenwood mic is electret I have switched bias on with MIC SEL
> although, surprisingly, the microphone seems to work equally well with
> it switched off!
>
> Does anyone know how to get the Kenwood DTMF mic to work with the K3?
>

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ke9uw

Re: K3 DTMF tones

What mic model # ?

Chuck Jack

Sent from my iPhone, cjack

> On Feb 7, 2018, at 8:09 PM, Don Wilhelm <[hidden email]> wrote:
>
> David,
>
> Are you certain the Kenwood mic is electret? Most are dynamic. Make certain the mic plug is wired for standard Kenwood pinout for HF mics, Some made for VHF rigs may be different.
>
> 73,
> Don W3FPR
>
>> On 2/7/2018 9:47 AM, David Pratt wrote:
>> In an archived message Lyle KK7P said .....
>>
>>> Currently, use of a DTMF-equipped microphone or generating the tones
>>> with an attached device. The K3 does not generate DTMF tones,although
>>> it could in a future firmware enhancement.
>>>
>>> 73,
>>>
>>> Lyle KK7P
>>
>> Well, in the absence of the long awaited DTMF software enhancement for
>> the K3 I have at last bought myself a Kenwood microphone, fitted with
>> an 8-pin plug that mates with the K3. But I have had no success in
>> getting the DTMF feature to work :-(
>>
>> As the Kenwood mic is electret I have switched bias on with MIC SEL
>> although, surprisingly, the microphone seems to work equally well with
>> it switched off!
>>
>> Does anyone know how to get the Kenwood DTMF mic to work with the K3?
>>
> ______________________________________________________________
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Chuck, KE9UW

Joe Subich, W4TV-4

Re: K3 DTMF tones

In reply to this post by Don Wilhelm

Elecraft and Kenwood reverse the pin used for +8V that powers
the DTMF encoder. You will need to move the wire on pin 5 of
the Kenwood Foster plug to pin 6 to get the +8V from K3/K3s.

The same is true if you want to use a Kenwood desk mic with
built-in preamp or active equalizer (e.g., MC-60A, MC-80, MC-85,
etc.) with the preamp or eq.

73,

... Joe, W4TV

On 2/7/2018 9:09 PM, Don Wilhelm wrote:

> David,
>
> Are you certain the Kenwood mic is electret? Most are dynamic. Make
> certain the mic plug is wired for standard Kenwood pinout for HF mics,
> Some made for VHF rigs may be different.
>
> 73,
> Don W3FPR
>
> On 2/7/2018 9:47 AM, David Pratt wrote:
>> In an archived message Lyle KK7P said .....
>>
>>> Currently, use of a DTMF-equipped microphone or generating the tones
>>> with an attached device. The K3 does not generate DTMF tones,although
>>> it could in a future firmware enhancement.
>>>
>>> 73,
>>>
>>> Lyle KK7P
>>
>> Well, in the absence of the long awaited DTMF software enhancement for
>> the K3 I have at last bought myself a Kenwood microphone, fitted with
>> an 8-pin plug that mates with the K3. But I have had no success in
>> getting the DTMF feature to work :-(
>>
>> As the Kenwood mic is electret I have switched bias on with MIC SEL
>> although, surprisingly, the microphone seems to work equally well with
>> it switched off!
>>
>> Does anyone know how to get the Kenwood DTMF mic to work with the K3?
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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>

David Pratt-2

Re: K3 DTMF tones

Thank you, Joe, Don and Chuck Jack; the mic is an MC-48 which is shown
as an electret on the schematic. I shall certainly swap the plug
connection from pin-5 to pin-6 and give it another go. I note that the
UP and DOWN buttons give some strange effects so those need my attention
too.

73 es tnx agn de David G4DMP

In a recent message, "Joe Subich, W4TV" <[hidden email]> writes
>
>Elecraft and Kenwood reverse the pin used for +8V that powers
>the DTMF encoder. You will need to move the wire on pin 5 of
>the Kenwood Foster plug to pin 6 to get the +8V from K3/K3s.

>The same is true if you want to use a Kenwood desk mic with
>built-in preamp or active equalizer (e.g., MC-60A, MC-80, MC-85,
>etc.) with the preamp or eq.

>73,

... Joe, W4TV

On 2/7/2018 9:09 PM, Don Wilhelm wrote:

tones,although
>>> it could in a future firmware enhancement.
>>>
>>> 73,
>>>
>>> Lyle KK7P
>>
>> Well, in the absence of the long awaited DTMF software enhancement
for
>> the K3 I have at last bought myself a Kenwood microphone, fitted
with
>> an 8-pin plug that mates with the K3. But I have had no success in
>> getting the DTMF feature to work :-(
>>
>> As the Kenwood mic is electret I have switched bias on with MIC SEL
>> although, surprisingly, the microphone seems to work equally well
with
>> it switched off!
>>
>> Does anyone know how to get the Kenwood DTMF mic to work with the K3?
>>

--
+ - - - - - - - - - - - - - - - - +
| David M Pratt, Kippax, Leeds. |
| Website: http://www.g4dmp.co.uk |
+ - - - - - - - - - - - - - - - - +

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David Pratt-2

Re: K3 DTMF tones

In reply to this post by Joe Subich, W4TV-4

I am delighted to report back that changing the wire from pin-5 to pin-6
has done the trick. DTMF tones work fine on the K3 as do also the UP and
DOWN buttons with MIC BTN On in the CONFIG menu. The DTMF tones also
work on the K2.

What is surprising, however, is that everything works equally well
whether MIC BIAS is On or Off. I would have thought that the voltage on
pin-6 of the front panel socket would have gone off when MIC BIAS is set
to Off, but that is evidently not the case.

Thank you again, Joe.

73 de David G4DMP

In a recent message, "Joe Subich, W4TV" <[hidden email]> writes
>
>Elecraft and Kenwood reverse the pin used for +8V that powers
>the DTMF encoder. You will need to move the wire on pin 5 of
>the Kenwood Foster plug to pin 6 to get the +8V from K3/K3s.

>The same is true if you want to use a Kenwood desk mic with
>built-in preamp or active equalizer (e.g., MC-60A, MC-80, MC-85,
>etc.) with the preamp or eq.

>73,

... Joe, W4TV

--
+ - - - - - - - - - - - - - - - - +
| David M Pratt, Kippax, Leeds. |
| Website: http://www.g4dmp.co.uk |
+ - - - - - - - - - - - - - - - - +

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ke9uw

Re: K3 DTMF tones

I’m thinking that the bias on/off is a voltage applied to the mic lead, pin 1. That works for some xlr hookups. I was thinking that pin 5 for the kenwood (also) powers the amp in the base of some of the kenwood mics. The pin 5 or 6 voltage is on all the time.

Chuck Jack
Ke9uw
Sent from my iPhone, cjack

> On Feb 8, 2018, at 4:24 AM, David Pratt <[hidden email]> wrote:
>
> I am delighted to report back that changing the wire from pin-5 to pin-6
> has done the trick. DTMF tones work fine on the K3 as do also the UP and
> DOWN buttons with MIC BTN On in the CONFIG menu. The DTMF tones also
> work on the K2.
>
> What is surprising, however, is that everything works equally well
> whether MIC BIAS is On or Off. I would have thought that the voltage on
> pin-6 of the front panel socket would have gone off when MIC BIAS is set
> to Off, but that is evidently not the case.
>
> Thank you again, Joe.
>
> 73 de David G4DMP
>
> In a recent message, "Joe Subich, W4TV" <[hidden email]> writes
>>
>> Elecraft and Kenwood reverse the pin used for +8V that powers
>> the DTMF encoder. You will need to move the wire on pin 5 of
>> the Kenwood Foster plug to pin 6 to get the +8V from K3/K3s.
>
>> The same is true if you want to use a Kenwood desk mic with
>> built-in preamp or active equalizer (e.g., MC-60A, MC-80, MC-85,
>> etc.) with the preamp or eq.
>
>> 73,
>
> ... Joe, W4TV
>
> --
> + - - - - - - - - - - - - - - - - +
> | David M Pratt, Kippax, Leeds. |
> | Website: http://www.g4dmp.co.uk |
> + - - - - - - - - - - - - - - - - +
>
> ______________________________________________________________
> 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
> Message delivered to [hidden email]

Chuck, KE9UW

Joe Subich, W4TV-4

Re: K3 DTMF tones

In reply to this post by David Pratt-2

> What is surprising, however, is that everything works equally well
> whether MIC BIAS is On or Off.

Bias to the electret element is not supplied by mic line - it's supplied
from the tone generator IC! The tone generator supplies voltage when
no buttons are pushed which enables the mic. When a button is pushed,
mic voltage goes away and the PTT circuit is enabled.

> I would have thought that the voltage on pin-6 of the front panel
> socket would have gone off when MIC BIAS is set to Off, but that is
> evidently not the case.
K3 Mic bias is DC on the mic audio line (pin 1). It has no effect
on pin 6.

73,

... Joe, W4TV

On 2/8/2018 5:23 AM, David Pratt wrote:

> I am delighted to report back that changing the wire from pin-5 to pin-6
> has done the trick. DTMF tones work fine on the K3 as do also the UP and
> DOWN buttons with MIC BTN On in the CONFIG menu. The DTMF tones also
> work on the K2.
>
> What is surprising, however, is that everything works equally well
> whether MIC BIAS is On or Off. I would have thought that the voltage on
> pin-6 of the front panel socket would have gone off when MIC BIAS is set
> to Off, but that is evidently not the case.
>
> Thank you again, Joe.
>
> 73 de David G4DMP
>
> In a recent message, "Joe Subich, W4TV" <[hidden email]> writes
>>
>> Elecraft and Kenwood reverse the pin used for +8V that powers
>> the DTMF encoder. You will need to move the wire on pin 5 of
>> the Kenwood Foster plug to pin 6 to get the +8V from K3/K3s.
>
>> The same is true if you want to use a Kenwood desk mic with
>> built-in preamp or active equalizer (e.g., MC-60A, MC-80, MC-85,
>> etc.) with the preamp or eq.
>
>> 73,
>
> ... Joe, W4TV
>