I would not think you would even hear your voice. The Cobra 29 does not have a PA mode. It does have a PA speaker jack for monitoring 11 meter frequency's. With a speaker mounted outside the vehicle. I would like to know the outcome for my own thoughts.
I don't know what mods have been done to your 29 but mine is stock and has a CB/PA mode switch along with a PA jack in the back. Yes, you can monitor traffic with the PA speaker. When in PA mode the Dynamike control is used for PA volume.
From the manual:
PA (Public Address)
Connect an external PA speaker to the PA jack
on the rear panel.
Set CB/PA switch to PA position.
Push and hold microphone button and speak
in a normal voice.Your voice will now transmit
on the PA speaker.
Adjust PA speaker volume with the
Dynamike® control.
Note
Speaker should have 8-ohm
impedance and be rated to
handle at least 4.0 watts.
Note
The speaker should be directed
away from the microphone to
prevent acoustic feedback.
Note
Activity on the CB channel will
be heard through the PA
speaker. Adjust volume control
to a normal listening level.
Ted
I must not have full formatting capabilities. Not enough posts I reckon.