I have never suggested that frequencies could be " choked up " by calls from VFR aircraft on ATC frequencies.
I have consistently said that just one self announcement on an ATC frequency normally used for separation of airline traffic could block out an important call. The chance is small but the results could be serious. That's why in other countries pilots would have licence action taken if they gave non directed VFR announcements on ATC frequencies. It's about professionalism compared to amateurism!
It's CASA that constantly refers to " choked up" or " overloading" when the real problem is just one call at the wrong time.
Last edited by Dick Smith; 6th Apr 2016 at 02:50.