[Gb-ccb] forwarded message from John Ford

[Richard Lacasse]

Tim,

I wonder if at some point in time we may want to tie the data to the 
instantaeous telescope position with higher accuracy than 1 second can afford. 
The gbt is fairly big and floppy and we are outfitting it with devices like the 
quadrant detector which can give an instantaneous position for part of the 
telescope at a 10 Hz rate.

Rich

Tim Pearson wrote:

> On Wed, 21 Jan 2004, Martin Shepherd wrote:
> 
> 
>>This brings up a dump-mode issue that I hadn't thought about yet.
>>Whereas the time-stamps of the 1ms integrations didn't need to be any
>>more accurate than about 0.5ms, dump-mode samples will presumably need
>>much more precise timestamps. So yes, your point about using a 10MHz
>>signal synchronized to 1PPS may be important.
> 
> 
> I do not think that accurate time-stamping of the dump data is a
> requirement. An approximate time (better than 1s) of the start or end
> of the dump is all that is needed, assuming the sequence of samples is
> really a continuous one. Higher accuracy would be nice, but not
> necessary. This is for diagnostics, not pulsar timing.
> 
> - Tim
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