[time-nuts] DMTD to MMTD

Bob Camp lists at cq.nu
Fri Feb 19 02:45:00 UTC 2010


Hi

The one I've done up sends hex ascii. It doubles the serial rate, but the decode on the computer end is *much* easier. With short cables and modern hardware, high speed RS-232 is pretty reliable stuff.

Bob


On Feb 18, 2010, at 9:41 PM, Magnus Danielson wrote:

> Bruce Griffiths wrote:
>> System constraints arent necessarily due to cost constraints.
>> The constraints may be imposed by experience limitations and the learning curve associated with FPGAs etc.
> 
> The level of design ability needed is still moderate, and for a skilled designer, the effort to produce one for a friend in need is moderate. The I/O is probably going to cause more head-ache than the measurement engine anyway. Even a serial port with binary data takes some care in designing.
> 
>> If one already has a high end DSP in the system its almost possible (with the right DSP) to implement the multichannel time tagging purely in software.
> 
> Getting it right with a DSP could be just as challenging.
> 
> Cheers,
> Magnus
> 
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