Elecraft

K3 microphone wiring ?

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Barry McWilliams

K3 microphone wiring ?

Thanks for the additional information in the FAQ about microphones.
But I still have a question.

The wiring for the K2 MD-2, MH-2 microphones and the Heil headset has 5V
applied to pin 1 through a 5.6k resistor.

Will the K3 be able to supply 5V on pin 1 through a 5k resistor via a
jumper or some sort of configuration option? If not, I don't think the
current Elecraft microphones will work properly.

Thanks, Barry (WK2S)
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g4ilo-2

Re: K3 microphone wiring ?

I thought the 5V went to pin 6. AF is pin 1.

But I'm confident Elecraft have thought of this...

Julian, G4ILO

Barry McWilliams wrote:

The wiring for the K2 MD-2, MH-2 microphones and the Heil headset has 5V
applied to pin 1 through a 5.6k resistor.

Will the K3 be able to supply 5V on pin 1 through a 5k resistor via a
jumper or some sort of configuration option? If not, I don't think the
current Elecraft microphones will work properly.

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Don Wilhelm-3

Re: K3 microphone wiring ?

In reply to this post by Barry McWilliams

Barry,

I believe the K3 comes permanently wired for the Elecraft microphones,
and that means there is a resistor between 5 volts and pin 1 (AF). If
one wants to use a microphone that would object to having that voltage
present on pin 1, a series DC blocking capacitor should be used.

My reasons to support those conclusions are the fact that Lyle said the
K3 mic is wired just like it would be in the K2 with all jumpers wired
straight across, coupled with the fact that the MH2 microphone is again
being offered for use with the K2 and K3 - if it did not require the
resistor, I would expect to see a change in the microphone numbering
designation.

73,
Don W3FPR

Barry McWilliams wrote:

> Thanks for the additional information in the FAQ about microphones.
> But I still have a question.
>
> The wiring for the K2 MD-2, MH-2 microphones and the Heil headset has 5V
> applied to pin 1 through a 5.6k resistor.
>
> Will the K3 be able to supply 5V on pin 1 through a 5k resistor via a
> jumper or some sort of configuration option? If not, I don't think the
> current Elecraft microphones will work properly.
>
> Thanks, Barry (WK2S)

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Eric Swartz - WA6HHQ

Re: K3 microphone wiring ?

Administrator

Don - On the K3 you can enable and disable the mic bias to pin 1 from
the menu, so it will work both with our microphones and any other
dynamic mic.

Also we have added more microphone input gain (adjustable) so operation
with the Heil HC4/5 mic's will be no problem.

73, Eric WA6HHQ
--------

Don Wilhelm wrote:

> Barry,
>
> I believe the K3 comes permanently wired for the Elecraft microphones,
> and that means there is a resistor between 5 volts and pin 1 (AF). If
> one wants to use a microphone that would object to having that voltage
> present on pin 1, a series DC blocking capacitor should be used.
>
> My reasons to support those conclusions are the fact that Lyle said
> the K3 mic is wired just like it would be in the K2 with all jumpers
> wired straight across, coupled with the fact that the MH2 microphone
> is again being offered for use with the K2 and K3 - if it did not
> require the resistor, I would expect to see a change in the microphone
> numbering designation.
>
> 73,
> Don W3FPR
>
> Barry McWilliams wrote:
>>
>> The wiring for the K2 MD-2, MH-2 microphones and the Heil headset has
>> 5V applied to pin 1 through a 5.6k resistor.
>>
>> Will the K3 be able to supply 5V on pin 1 through a 5k resistor via a
>> jumper or some sort of configuration option? If not, I don't think
>> the current Elecraft microphones will work properly.
>>
>> Thanks, Barry (WK2S)
> _

Van W1WCG

Headphone Jack ???

In reply to this post by g4ilo-2

A question for Elecraft, when y'all have time ;<)) :

It's a little bit of a guess looking at the picture, but the phone jack on
the front panel appears to be a 1/4" type rather than the 1/8" size found on
the K2, while the jack on the rear panel appears to be a 1/8" jack. Is this
the case?

If so, the 1/4" jack in the front is a good choice, bearing in mind the
problems at least some folks have had with the smaller jack in the K2. Was
any thought given to the specs of these jacks to try to avoid such problems
??

TIA,

Van W1WCG
K2 2634, 5510
K3 ???

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Don Wilhelm-3

Re: K3 microphone wiring ?

In reply to this post by Eric Swartz - WA6HHQ

Thanks for that additional info Eric.

73,
Don W3FPR

Eric Swartz - WA6HHQ, Elecraft wrote:

> Don - On the K3 you can enable and disable the mic bias to pin 1 from
> the menu, so it will work both with our microphones and any other
> dynamic mic.
>
> Also we have added more microphone input gain (adjustable) so operation
> with the Heil HC4/5 mic's will be no problem.
>
> 73, Eric WA6HHQ
> --------
>
> Don Wilhelm wrote:
>> Barry,
>>
>> I believe the K3 comes permanently wired for the Elecraft microphones,
>> and that means there is a resistor between 5 volts and pin 1 (AF). If
>> one wants to use a microphone that would object to having that voltage
>> present on pin 1, a series DC blocking capacitor should be used.
>>
>> My reasons to support those conclusions are the fact that Lyle said
>> the K3 mic is wired just like it would be in the K2 with all jumpers
>> wired straight across, coupled with the fact that the MH2 microphone
>> is again being offered for use with the K2 and K3 - if it did not
>> require the resistor, I would expect to see a change in the microphone
>> numbering designation.
>>
>> 73,
>> Don W3FPR
>>
>> Barry McWilliams wrote:
>>>
>>> The wiring for the K2 MD-2, MH-2 microphones and the Heil headset has
>>> 5V applied to pin 1 through a 5.6k resistor.
>>>
>>> Will the K3 be able to supply 5V on pin 1 through a 5k resistor via a
>>> jumper or some sort of configuration option? If not, I don't think
>>> the current Elecraft microphones will work properly.
>>>
>>> Thanks, Barry (WK2S)
>> _
>
>

Tom-5

Re: K3 microphone wiring ?

In reply to this post by Eric Swartz - WA6HHQ

Eric Swartz - WA6HHQ, Elecraft wrote:
>Don - On the K3 you can enable and disable the mic bias to
pin 1 from the menu, so it will work both with our microphones and any
other dynamic mic.

With all due respect Eric and Wayne...

Is there ANYTHING you guys DID NOT think of?

Looking forward to seeing what my
"in the que" radio really looks like at Dayton.

tom K8TB

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Greg - AB7R

RE: Headphone Jack ???

In reply to this post by Van W1WCG

Van,

You are correct. The front phones jack is a 1/4-in plug and the phones on
the back panel is 1/8-in.

Another interesting feature is that you can plug headphones into both jacks
at the same time. So when contesting, if you want to have an additional set
of ears listening you can.

73 and thanks.
Greg
AB7R

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]]On Behalf Of Frank Van Cleef
W1WCG
Sent: Saturday, May 12, 2007 12:49 PM
To: [hidden email]
Subject: [Elecraft] Headphone Jack ???

A question for Elecraft, when y'all have time ;<)) :

It's a little bit of a guess looking at the picture, but the phone jack on
the front panel appears to be a 1/4" type rather than the 1/8" size found on
the K2, while the jack on the rear panel appears to be a 1/8" jack. Is this
the case?

If so, the 1/4" jack in the front is a good choice, bearing in mind the
problems at least some folks have had with the smaller jack in the K2. Was
any thought given to the specs of these jacks to try to avoid such problems
??

TIA,

Van W1WCG
K2 2634, 5510
K3 ???

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