[Elecraft] MH2 Microphone issue

[Don Wilhelm]

  The low voltage is probably your problem.  I would think 3 volts is 
too low for the microphone element.
I know 3 volts is too low for proper operation of the microprocessor, 
and since you have not said anything about other strange symptoms, I 
would first check your voltmeter.  Do you read 5 volts or 3 volts at the 
output terminal of RF Board U8 - it should be 5 volts.  If you read 3 
volts at RF U8, try an different voltmeter.

Is the regulator getting quite warm?  If so, you may have a fault on the 
5 volt line somewhere.  If it is not heating up, the most likely reason 
is a bad regulator.

73,
Don W3FPR


On 2/25/2011 9:24 AM, KA1YMX wrote:
> The 5v regulator U5 on the control board has an output of 3.0v. I
> disconnected the front panel from the control panel and the output is still
> around 3.0v. Do you think the lower voltage could affect the operation of
> the microphone?
>
> I also noticed there is an update to grounding the microphone jack. Could
> the lack of ground some how cause this?