[Elecraft] K3: R-MH2 mic problems

[Don Nesbitt]

Hi John - the front panel message " FP.H b1 A5 " really is FP. (means Front
Panel Mic Connection) H (means "high" sensitivity) and the b1 A5 is just an
attempt to write the word "bias" within the limitations of the LCD display!
That is b = b, 1 = i, A = a, and 5 = s.  You are not the first one to be
confused with the b1 A5!  This means that you have "bias" turned on and that
is why you are hearing a noise from the mic.  Turn "bias" off - this is done
by tapping either the "1" or the "2" (not in front of radio right now) when
you are in this menu mode. You might want to consider updating to the latest
firmware.

Have fun es gud dxing -- Don N4HH  K3/100 #83

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of VE3NFK
Sent: Sunday, April 27, 2008 3:15 PM
To: elecraft at mailman.qth.net
Subject: Re: Re:[Elecraft] K3: R-MH2 mic problems


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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