When I was a child I used to spend summer time in Rinconada, a place in the Andes near Argentina . It was a beautiful but isolated place. My family talked with other people that were in the same living conditions using the radio: " CQ 40 CQ 40 hablando en banda de 40 metros" that was the first message or call given.
I was proud of using those special codes.
My QRA is Sandra and my QTH is in Rinconada, Chile. There is a lot of QRM today,I cannot hear you. Tell me the QTR to send the QTC
This codes could be questions or answers. To communicate with those messages it was fun...