On 14 June 2010 10:46, Magnus Danielson <[email protected]> wrote:
> Still puts it in the mid-tau range as a method. The useful range and > precision of a particular implementation of the method will vary. By putting a GPSDO in the usual place of the DUT and putting the 10811 in place of the reference oscillator it could work well beyond the 1000s point. CAVEAT: this only works for a DUT that has an EFC that is reasonably linear. >> So if you are just thinking about the TPLL for taking ADEV data from 0.1 >> to 1000 sec, then you're are missing 90% of the other useful stuff it >> can do as good or better than most anything thing else out there, and >> all for the same $10 (my cost). > > The typical price-tag of a 10811 is in 100-150 USD. I think it is reasonable > to assume that a TPLL weighs in at about 200 USD with all support mixers, > amplifiers, ADCs etc. It's not bad, but if you don't have the parts that's > about what you need to spend at least. If you really wanted to be a scrooge, you could open the case on one of those plethera of HP intruments and temporarily borrow that 10811 that is just sitting there. As for something like a ADC, you could find a DAQ on fleeBay which could do duty here and also be a useful tool for general purpose use. Heck, you can use your sound card to digitize the EFC, provided it is DC coupled. >> BTW, with a couple of minor configuration changes, the TPLL BreadBoard >> can be transformed into a LPLL, >> so the usefulness of the basic Universal TPLL BB circuit has even more >> possibilities. >> In fact one could make yet another list of all the additional things it >> can do with no added cost, >> just by changing a few jumpers and values. >> But those things are for later discussions, one windmill at a time. > > Measurement of phase noise is what the LPLL is good at, especially when done > in cross-correlation mode. Interferometric setups use the mixers better. > Both these techniques could be used for LPLL and TPLL measures. Do you have some pointers to these setups please Magnus? Cheers, Steve > 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. > -- Steve Rooke - ZL3TUV & G8KVD The only reason for time is so that everything doesn't happen at once. - Einstein _______________________________________________ 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.
