Barney Hamlin checks back in and has the following update on INMARSAT frequencies being used in support of the STS-121 launch.
NASA KSC was heard on five Inmarsat frequencies yesterday:
1535.5250
1538.4500
1539.5250
1539.8750
1540.0500
1539.8750 was the most active. A few times during the day traffic could be heard simultaneously on two channels. They had a big pre-flight briefing at 10a.m. yesterday which lasted over an hour. Traffic was monitored throughout the day until approximately 3 p.m. Eastern Time yesterday afternoon (June 30).
As Paul Marsh mentioned, 261.875 on UHF milsat was very active during this same period with several aircraft contacting Cape Osborne (Cape Radio) and Wolf Hound.
Call signs included: Mexican (a/c) Rescue Bird (a/c),and East Rescue Bird (a/c).
So far nothing has been heard today.
And I concur with Barney and Paul's observations. Today has been quiet accept for an occasional HF check on ETR Primary (10780 kHz USB).