Bill Ress wrote:
- What is the reason for requiring all LO's to be locked to a 10 MHz
satellite system clock or are they?
That requirement comes from me. It is my fervent hope that we will be able to use the transponders for accurate coherent s/c ranging; therefore we want the TX and RX LOs to be related to a common (high stability) reference. There are also some (undocumented) desires (that may re$ult in $ome project $upport) to use the microwave transponders for high accuracy, intercontinental time & frequency synchronization.
- Have the performance specifications for the 10 MHz clock been
developed and what are they (in particular phase noise, frequency stability, susceptibility to digital hash, and power level available to each using subsystem - to name a few)?
My desire, if it can be promoted (from unnamed $ource$), to use what is often called an Ultra-Stable Oscillator (USO) of the type carried on a number of interplanetary s/c. I envision us being able to tweak the frequency slightly under ground command (i.e. a D/A converter built into the USO).
My apologies for sending to the entire Eagle list but I'm not sure who has the responsibility for the clock.
System level responsibilities are up for grabs AFAIK. So far, my contribution has been to say "It would tremendously augment capabilities if ...".
Please keep asking these questions! 73, Tom