From: damarkley@gmail.com   
      
   On Friday, May 28, 2021 at 1:02:53 AM UTC-4, JF Mezei wrote:   
   > On 2021-05-27 17:51, Jeff Findley wrote:   
   >   
   > > But, I'd imagine that Dragon would not be completely powered down simply   
   > > because you wouldn't want to chance that it wouldn't power back up in an   
   > > emergency. And if that's the case, I'd imagine that SpaceX would be   
   > > monitoring it 24/7.   
   > But if a ship is docked to station, it is possible its own radios are   
   > powered down and it is connected to the world via the ISS's comms   
   > infrastructure.   
   >   
   >   
   > Even if SpaceX developped a command/control protocol that gives each   
   > ship its ID, allowing it to send commands to a specific ship when many   
   > are in the air, there is the issue of ground station and TDRS network.   
   >   
   > Each SpaceX ship needs to exist as its own routable entity so commands   
   > from Hawthorne know which ground station and TDRS satellite to use to   
   > reach that one ship.   
   >   
   > Obviously, Shuttle and ISS were independantly routable, but were each   
   > orbiter independnt from the others or were there all considered the same   
   > ship from point of view of ground stations and TDRS?   
   >   
   >   
   > And back in Gemini days, did both ships transmit telemetry constantly,   
   > and if so, how did they co-exist without crushing each other's   
   > transmissions?   
   Why would you assume telemetry would use a single frequency?  Their are   
   thousands of spacecraft in orbit from dozens of countries.   
      
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