Re: [time-nuts] What size graphs do people like? (How big is yourscreen?)

Hi, > SVG is uncompressed text. PNG compresses well, at least for simple cases. Decently configured web servers will compress SVG on the fly during transport, wich yields a 9k transfer size. (and your server is definitely not properly configured for SVG, it doesn't compress and serves it as text

Re: [time-nuts] GLONASS receiver

Hi, > GSM and derivates have +/- 50 ppb as frequency requirement, no time > requirement. Note that GSM also have the constraint that all timing / frequencies in the system must be derived from the same reference. This way carrier freq / symbol rate / gsm time are all linked the same way. Cheers

Re: [time-nuts] Crosscorrelation phase noise measurements

Hi Magnus, Thanks a lot for the concise and very clean explanation. The cross-correlation part between the two signal was clear enough in my head but I didn't really see how it would achieve much gain. I didn't think about averaging many resulting spectrum while they're still complex (and not jus

[time-nuts] Crosscorrelation phase noise measurements

Hi, I've heard and read some documents about using cross-correlation using two distinct reference oscillators when trying to measure the phase noise from a source to reduce the influence of the reference oscillators phase noise. Unfortunately, it's still not exactly clear to me how it works ... d

Re: [time-nuts] Cables dor 10 mHz

> 10 mHz Please use MHz ... 10 mHz is 10 milli-hertz, ie 1 cycle every 10 second. An yes, ethernet not being coax cables, I'd expect them to act as antennas quite a bit ... Cheers, Sylvain ___ time-nuts mailing list -- time-nuts@febo.com To

Re: [time-nuts] LEA6-T Group Buy

Hi, > Anyone know if these will have the RAW output for use with RTKLib? I'm not sure exactly what's required for RTKLib, but you can read the ublox protocol specs to know what informations are available. > Also assume can program for 10 MHz out? Yes, but it's not necessarely a good idea. The

Re: [time-nuts] LEA-6T Group buy

Hi, Note that there should soon be a LEA6T eval board available from sysmocom http://laforge.gnumonks.org/weblog/2012/03/16/#20120316-osmo_lea6t_gps_timing Estimated price is 90 EUR excl VAT in the EU. Cheers, Sylvain ___ time-nuts mailing list

Re: [time-nuts] FE 5680A "new version" - Filtering the 10 MHz

>>> It's not generated from a DDS. It's from a xilinx PLD, > > I think the DDS is implemented inside the PLD. > > Sying "that is not a DDS, it's a PLD, is like saying "That is not an > amplifier, it is a transistor." But a DDS would require a DAC somewhere. Here, I see can see the trace from the P

Re: [time-nuts] FE 5680A "new version" - Filtering the 10 MHz

> I would rather say DDS generated and poorly filtered It's not generated from a DDS. It's from a xilinx PLD, then through a L and then through a C to the RF connector. The signal at the L output is fairly sinusoidal (at least monotonic near the crossing), but after the cap, it's like that ... Ch

Re: [time-nuts] FE 5680A "new version" - Filtering the 10 MHz

Hi, > If the problem is only harmonics (cleaning up a square wave), a simple LC > low pass filter with a cutoff midway between the fundamental and second > harmonic might be a better choice because it minimizes the tempco-related > phase shift that either a high Q filter, or one with a cutoff near

[time-nuts] FE 5680A "new version" - Filtering the 10 MHz

Hi all, As noted somewhere on the list, the 10 MHz output of the newer version units is less filtered than before. The output at the internal RF connector is even worse (there is some more filtering going on inside the DB9 itself). I'm looking for ways to clean up that 10 MHz output, preferrably