NASA
From HFUnderground
Most of communications NASA does with airplanes and spacecraft happen on VHF, UHF and higher frequencies. However, during every space shuttle launch, there are HF communications between Cape Radio, the Booster Recovery Director and the Solid Rocket Booster (SRB) recovery ships Freedom Star and Liberty Star.
There is a long list of possible frequencies for these communications, but only a few of these have been heard in 2008 and 2009. Those have been marked with a *. Communications are in USB mode, in voice as well as ALE data bursts (automatic link establishment).
| Frequency | Last heard |
| 2764 | |
| 2836 | |
| 3041 | |
| 3120 | |
| 3187 | |
| 3365 | |
| 4993 | |
| 5011 | |
| 5180 | |
| 5246 | |
| 5711 | March(?) 2009 |
| 5810 | |
| 6897 | |
| 6937 | |
| 7525 | |
| 7765 | |
| 7833 | July 2009 |
| 9043 | July 2009 |
| 9132 | July 2009 |
| 10780 | July 2009 |
| 11104 | |
| 11205 | |
| 14973 | |
| 17780 | |
| 20185.6 | |
| 20390 |
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