Hi So basically what I get when I buy a 5115 is a limited frequency range box that isn't quite as good as (as in 40 db worse than floor) an HP 3048. Of course I'd need to buy a cheap synthesizer to go with the 3048 if I wanted to do the "any frequency" stuff at the 5115 level.
Bob On Apr 7, 2010, at 7:04 PM, John Ackermann N8UR wrote: > I just took a look at the datasheets for the 5115, 5120, and 5125. . > > The 5115 is the "base" model covering through 30 MHz and without a > cross-correlation capability. At 10 MHz input frequency, its spec is -133 > dBc/Hz at 1 Hz offset, and -147 dBc/Hz at >100 Hz offset (not spec'd at > greater offsets, so presumably that's the floor). > > The 5120 adds correlation to lower the noise floor. At 10 MHz input > frequency, it is spec'd at <-145 dBc/Hz at 1 Hz, and <-175 dBc/Hz at 10 kHz. > > The 5125 extends the 5120 frequency range to 400 MHz. At 10 MHz its > "typical" performance is -145 dBc/Hz at 1 Hz offset and -170 dBc/Hz at 10 kHz > (specified performance is about 5 dB worse; the other two datasheets only > specify spec, not typical). The floor increases with frequency, with the > close-in noise going up more rapidly than the floor further out. > > All three are spec'd at 1 dB accuracy, and can measure at offsets down to 1 > milliHertz. One thing that's nice about the TSC boxes compared to > traditional PN measurement systems is that the reference doesn't need to be > at the same frequency as the DUT. > > John > ---- > > Jeffrey Pawlan said the following on 04/07/2010 05:52 PM: >> Dear Nicholas, >> Thank you for getting this discussion back to technical aspects related our >> real quest for technical information. >> Please look in your actual documentation for the current model 5125 and >> confirm its actual specs. I had read some specs on the Symmetricom website >> but I do not know for which model. Although automated and easy to use, I >> remember that the phase noise floor was lackluster and makes me think that >> this may be fine for very close-in measurments but not for the usual 100Hz >> to 100KHz offset measurments. Please let us know what you find with this >> equipment. >> Regards, >> Jeffrey Pawlan >> _______________________________________________ >> 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. > _______________________________________________ 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.
