[Elecraft] K3 microphone wiring ?

[Don Wilhelm]

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)
>> _
> 
>