A question about telemetry receivers: Programmable Bit Synchronizer

  • Thread starter senmeis
  • Start date
3 replies · 516 views · last reply
senmeis
Messages
85
Reaction score
4
Hi,

This receiver, https://semco.com/wp-content/uploads/R300_Series.pdf, shall be used to receive telemetry data from launch vehicles. As far as I understand it analyzes and processes RF telemetry signals and outputs telemetry data over Ethernet (TM-over-IP). I just can’t understand what „PROGRAMMABLE BIT SYNCHRONIZER“ refers to because under it there is a section „Input and Output Codes“. Can anyone explain it for me?
 

Discussion

If you look up NRZ and Bi-Phase (for example), you'll see the differences between them. Those differences are what a programmable bit sync needs to adjust to.
 
It is well known patterns such as Bi-Phase are suitable for bit synchronization, but that’s not the point. As mentioned the input = RF signal, the output = Ethernet. Why is there another pair of input/output (NRZ-L/M/S, Bi-Phase-L/M/S, DM-M/S, MDM-M/S and RNRZL-L)?
 
Not 'Another' input - just more detail on the input. In order for a bit sync to work, it needs to 'know' what encoding method is in use. The paragraph that you asked about is just telling you what the bit sync is capable of locking up to.