Originally Posted by
Lascaille
I guess - as the culprit here - I should clarify that I was wrong; both the VASAviation youtube video and the LiveATC recordings were two different radio channels spliced together, the helo was transmitting on a separate frequency.
The tower was transmitting on both frequencies - I believe - simultaneously.
So the CRJ would have heard only the tower's transmissions to the helo ('visual separation approved' x 2) and not the helo's transmissions.
Wasn’t intending to criticize, just offer the explanation.
It is not always understood on pprune (and again not you, mostly casual posters) that liveatc.net is just hobbyist / enthusiast stuff. It’s not reliable. The antenna placement is often poor, so some transmission sounds bad.
Same with using ads-b data from various sources and plotting tracks. Sometimes it is meaningful and sometimes the position is way too undersampled.
And don’t get me started on taking derivatives / differences on noisy undersampled signals to get things like wow look at that vertical speed here.