>The phase of the PPSOUT and the generated 10 MHz will probably not align up, >something which is critical to some applications. Yes, for example the DVB-T SFN requires the PPS and 10MHz phases to be aligned, better, not to move. This requires to slightly alter the 10MHz to keep the PPS aligned.
Let me ask Bjorn: did you succeed in aligning the two PRS10? Moreover, what do you mean by "each other", a scheme like this: |-------------------------------------------------------------------| | | | PRS10A PRS10B | |--->PPS IN PPS OUT------>PPS IN PPS OUT--| hoping that the font doesn't mess up the ASCII schematic... On Wed, May 2, 2012 at 11:07 PM, Magnus Danielson < [email protected]> wrote: > Hi Azelio, > > On 05/02/2012 10:30 PM, Azelio Boriani wrote: > >> Magnus, you are correct but can I avoid to list our beloved >> counters/analyzers? The time-nut main tool is the TIC. >> > > Hehe, yes. But you can do great things even with a spare HP5335A for > instance. It's quite respectable with about 1 ns resolution in this context. > > I have not tried using the SIA-3000 for TIC purposes. Just "getting into" > the machine GPIB-wise is a bit of a challenge. > > Anyway, to correct the PPS input for the PRS10 the hardware approach is a >> must: so a delay line and a microprocessor are needed. Unless the SRS can >> develop a suitable software for the PRS10 (an inverted TTL serial line is >> already present) to read the M12+. >> > > Well, look at the Spectratime SRO-100, which already has that feature. > > http://www.spectratime.com/products/isync/gps-disciplined/SRO-100 > > Architecture-wise it is very similar to the FEI 5680, a 60 MHz VCXO, DDS > for FLL and then DDS for output. PPS input and output makes you think about > PRS-10. The PPS input has about 1 ns resolution. > > Now, there is a few things which differs from the PRS-10. It move it's > internal (and later also its output) PPS to align up to the PPS reference. > It hence does not need an output alignment. This makes the 7,5 MHz clock > (133 ns cycle) less critical. BTW I do the same in my products. The phase > of the PPSOUT and the generated 10 MHz will probably not align up, > something which is critical to some applications. > > Also, it can take info from Jupiter-T, OnCore, M12+ and SuperStar II > receivers for detailed timing info. > > Cheers, > Magnus > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
