[Elecraft] turn off head phone monitoring

[Lyle Johnson]

In a word, no.  The same D to A converter that drives the headphones 
drives the speaker amplifier, too.  You can have both, or just 
headphones, but as long as the headphones are plugged in, you can't have 
speaker with no headphones.

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.

73,

Lyle KK7P

> Is there any way to switch off the monitoring feed to the speaker(s) to
> avoid feedback, while leaving it available as usual in the headphones?