Hi Everyone; Please excuse me, I am jumping in a little late. This Fury unit is interesting, Is the price reasonable? Which MTI oscillator do they use? the 5MHz 260-0504? To expand things a bit, how do the Fury, Z3801A, Z3805A, Z3811A, Z3816A, 58503A and 58503B compare? I just picked up a Z3811A and plan to characterize it this weekend. If anyone is interested I will list results. It has the same 5MHz MTI 260-0624 that the Z3805A has? Does anyone have specs for this version of the 260? Best Wishes; Thomas Knox
Quoting [EMAIL PROTECTED]: > Hello Ernie, > > Glad your HP is still working well. > > Well it seems you found out how well the Fury is working with an excellent > OCXO :) > > The unit running in Mexico achieves similar performance with our standard > double oven OCXO, see for example: > > _http://resco.ucol.mx/Fury/gpsstat.htm_ > (http://resco.ucol.mx/Fury/gpsstat.htm) > > It has not jumped in several days, and the standard deviation is between > 1.7ns to 1.8ns when it doesen't jump during the last 24 hours. > > Yes, the TI as displayed by GPSCon is much better than the HP unit. I think > this is mostly due to the much better GPS receiver in the Fury, since the > OCXO of the HP unit is extremely good. > > Tom and I had discussions about this being caused by the small sawtooth > low-pass filtering we do on the TI intervall (Z3801A does the same thing, > otherwise you would see the full GPS Sawtooth). The theory was that > this was what > was causing the Fury to be so much better on GPSCon. > > To check this, we modified the firmware to completely remove this sawtooth > filtering, and output the raw data instead, with all the nasty sawtooth > artifacts on it. > > This did not change the result much, I think the max range went from +/-10ns > to +/-15ns if I remember correctly. > > So even if we display true raw capture data, we are still significantly > better than the Z3801A which displays low-pass sawtooth filtered data. > > I think this can mostly be attributed to the extremely good performance of > the M12M GPS compared to the Oncore GPS in the HP unit. > > Also, I think you will see that your HP unit will get better over time, as > the Crystal retraces and ages over the next weeks, and the control voltage > changes will hopefully get to be smaller and smaller on your unit. > > bye, > Said > > > In a message dated 11/13/2008 14:38:57 Pacific Standard Time, > [EMAIL PROTECTED] writes: > > But both unit , the HP and the FURY board running under the same > software simultaneously / GPS Con / and I was mentioning the same small > "windows" TI to GPS, and the FURY displays much better figures then > HP.....but probably each units gives out / display / different > data?????? > Also the graphic display / BLUE / on the FURY board the max ampl > between +2,2nsec and -2,0nsec sometimes +0,7nsec , > -1,7nsec... > the HP unit never goes under +15nsec and -20nsec...... almost 10 times > worse..... > Anyhow I am happy because it seems to me that the HP is still OK after > 3 years of sleep..... > > Rgsa Ernie. > > _______________________________________________ > 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.
