SNS3, confirm you are using a standalone handheld sat phone, with no connection to (or a repeater in) the aircraft, and it works at 500kt. If so, what handset model is it?
As I said before, I don't know what model. According to the AOM two different models are in use, as decribed above.
SNS, confirm then this is a system that's only been used by the cockpit crew? Not for the passengers and not for fancy things like broadband internet connection and so forth?
There aren't any passengers, and we don't get internet. It's for our use in the cockpit alone. We use it for progress reports, maintenance, diversions, re-releases on flights with special fuel reserves or no alternates, updating equal time points, and calling in and out with base stations or the frequent military flights we conduct.
It's not fancy, but it works.