Trevelyan,
You are quite right - nothing to lose by making blind calls, and it sounds like you did exactly the right thing.
What bothers me is that it also sounds like the other aircraft probably wasn't on frequency. (As you say, it is possible he was listening out... but realistically, who listens out on a frequency at an airfield, when others are on frequency, and doesn't transmit?)
It's possible he was in a non-radio aircraft, of course. There was absolutely no requirement for him to use a radio even if he had one. He's probably been doing circuits at that same farm-strip for the last xx years without using a radio. Etc, etc, etc.
But if Safetycom had been my creation, I'd be getting warm fuzzy feelings from stories about two pilots using Safetycom to communicate with each other and carry out a safe flight, and cold (almost) why-did-I-bother feelings from stories about airfields where there were two aircraft and at least one of them wasn't on frequency, albeit both flights were carried out completely safely. Get where I'm coming from?
Still, early days.....
FFF
------------