Yes, this caught me out (for I don't know how many times before) during JOTA, 
where I was listening with phones, while others were listening on the speaker - 
so monitor was on (I tend to have it up high, so when I talk, I don't shout, 
which I have a tendency to do).

Then I key'd the mic and howl!

Just an option to cut monitor on Tx would be good, because by then, I've 
usually puuled the phones of my head, to hear what people in the shack are 
saying.
But cutting just the monitor to speakers would be even better.
73 de M0XDF, K3 #174, P3 #108
-- 
Dear God, Did you mean for the giraffe to look like that or was it an
accident? -Norma [Children's Letters to God, 1991]

On 23 Nov 2010, at 07:46, Ian White GM3SEK wrote:

> N5GE wrote:
>> There is no switch to turn the monitor on or off.  If you don't want to 
>> here it set it to zero.
>> 
> 
> There are many situations such as club, contest and special event 
> stations where a loudspeaker is needed for RX, while the operator also 
> needs a low-level monitor signal into the headphones for TX.
> 
> 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?
> 
> It is always bad practice to monitor a live microphone transmission 
> through a  speaker, because even low levels of acoustic feedback will 
> affect the signal quality. The default for all voice modes should be to 
> mute the LS channel automatically while transmitting.

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