18-12-2021, 05:44 PM
My two cents 
The problem with selcall I’ve experienced on 40m from time to time is when I’ve been having a QSO with someone and some fool has suddenly sent a selcall over the top of us, clearly without first listening on the frequency, and/or first asking “is this frequency in use”.
If the use of selcall was confined to a published single or couple of specific frequencies in a band at least the interference problem is unlikely to occur i.e establish contact then move to another frequency.
The ACMA may not have much interest in the AR service these days, but FWIW I recall in the past when the subject of interference arose, their view of selcall on AR was that such were technically unidentified transmissions, in that the licensee’s callsign was not included, something required by the LCD at the beginning of a contact or when calling.
The problem with selcall I’ve experienced on 40m from time to time is when I’ve been having a QSO with someone and some fool has suddenly sent a selcall over the top of us, clearly without first listening on the frequency, and/or first asking “is this frequency in use”.
If the use of selcall was confined to a published single or couple of specific frequencies in a band at least the interference problem is unlikely to occur i.e establish contact then move to another frequency.
The ACMA may not have much interest in the AR service these days, but FWIW I recall in the past when the subject of interference arose, their view of selcall on AR was that such were technically unidentified transmissions, in that the licensee’s callsign was not included, something required by the LCD at the beginning of a contact or when calling.