[Elecraft] turn off head phone monitoring

[Phil Kane]

On 11/23/2010 6:30 AM, Lyle Johnson wrote:

> Due to the need for "anti-pop" circuitry in the speaker amplifier, the
> command from the DSP to turn it off takes a second or so.  This makes it
> impractical to mute on Tx but enable on Rx.

  External solution:

  Route the speaker through a relay NC contacts to the cable that
  plugs into the external speaker jack.  Activate the relay from
  the PTT line that was designed to activate an external amplifier.

  When all the digital/solid state circuitry just doesn't solve
  the problem - build a kludge box!  In the spirit of ham radio....

--  73 de K2ASP - Phil Kane
    Elecraft K2/100   s/n 5402