In ,
Robin Leadbeater typed:
That's just the problem. They did! Both are tuned to the same
frequency. Unfortunately, it appears that nobody allowed for the
doppler shift which will put them out of tune relative to each other.


Nearly...

The article at explains it all
http://www.spectrum.ieee.org/WEBONLY...1004titan.html

Carrier doppler shift had been allowed for. They didn't allow for resulting
changes in the frame rate of the 8192 bit data blocks that modulate the
carrier. I would have expected these blocks to have had proper headers for
data synchronisation, but it looks like they were relying purely on accurate
timing, presumably to keep the electronics simple.

Jo