[Elecraft] K3: R-MH2 mic problems

[Ken K3IU]

John:
Go top page 49 [Menu Functions] of the manual (rev c). Read what it says 
in the Main Menu Table under MIC SEL entry.
73,
Ken K3IU
~~~~~~~~~~~~~~~~~~~~~~~~

VE3NFK wrote:
> Hi I have sn 709  - I have my Heil HC4 from my TS-2000  8 pin conn - when I
> plug it into the K3 - I hear noise from the MICROPHONE???   
>
> The 'manual' says:  " to select front or rear panel microphone AND to turn
> BIAS on/off, use the MAIN:Mic SRC menu entry..
>
> My firmware 1.78 only shows:  MIC SEL      FP.H b1 A5 and I have not figured
> out how to adjust it - the main VFO knob also gives me a choice of rP.H and
> LInE  In   ..
>
> On a separate note  - I have this anomaly that I emailed support on Friday
> night:
>
> "Managed to 'lock-up' my K3  - NO buttons work - including power - had to
> pull the power plug....
> going thru the config menu  - at PTT-KEY  both ' OFF-OFF'  tried to change
> values and complete lockup
> Completely repeatable  - go to config PTT then  move main vfo control and
> lock up.
> Was on AM 13840 listening to a SW station/
> Changed mode/freq  - still does it - as soon as main VFO adjusted.  "
>
> Any advice/help comments?
>
> tnxs
>
> John VE3NFK
>
>
>
> Gary Hembree wrote:
>   
>> This is a known problem with the Rev B front panel artwork.  I had the
>> exact same problem with a MH2 mike when I first used my K3/100 SN 729 a
>> week ago on 6 meters to contact a local friend who is a well-known VHF and
>> HF DXer and contester.  Unfortunately it did not make a good impression! 
>> There is a ground trace missing from one end of C98 and C97 on the front
>> panel board.  These capacitors are associated with the mike bias circuit. 
>> Hence the problem with the MH2.  I am told that an official Elecraft fix
>> is going to be released this coming week.  Several of us who noticed this
>> problem were given the fix to try and it worked three out of three times. 
>> If you must use a mike that needs bias then use the rear panel connector
>> for now (i.e. Elecraft or Icom Proset).  MH2s are excluded of course,
>> unless you have an appropriate adapter.  688 is the earliest SN that we
>> know is affected.  The other three were 690, 728 and 729.  Elecraft is
>> fixing front panel boards now before they ship anymore.
>> 73
>> Gary, N7IR
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>>     
>
>