[time-nuts] Phase Noise Comparisons

Bob Bob bobbob55 at hotmail.com
Sun Jan 17 15:45:21 UTC 2016


For software I'm using PN3048 from k35fx's site together with an Aglient 82347b GPIB interface running thru Virtual Box. Other than not recognizing the instruments once and a while, its been pretty reliable. I've also gotten the original BASIC program to work under HT BASIC and surprisingly is more reliable in terms of communicating with the devices.
I  ran the test at 10mhz against the builtin oscillator that comes with the hp11848a. I also ran a test against a Fluke 6070a at 100mhz and got almost the exact same results from 1khz on out. Maybe I got lucky with my 8660c. It would be interesting to see measurements from a few other units.
David

> From: rob at nc0b.com
> To: time-nuts at febo.com
> Date: Sun, 17 Jan 2016 04:21:40 +0000
> Subject: Re: [time-nuts] Phase Noise Comparisons
> 
> Hi Dave,
> 
> Very good.  Interesting you data is better than any typical data I could find on the web which was -105 to -107 dBc/Hz at 10 kHz. 
> 
> I need N0QO to get his 3048A up and running again so we can test some other equipment.
> 
> What are you using for software?
> At what frequency was this plot made?
> 
> I tried to send a moderate size PDF, but it at least temporarily has been blocked. 
> 
> Rob
> NC0B
> 
> -----Original Message-----
> From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Bob Bob
> Sent: Saturday, January 16, 2016 8:37 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Phase Noise Comparisons
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Actually, I just acquired a HP3048a phase measurement system and I'm measuring all of the my signal generators, one of which is an 8660c with the 86603 plugin.  Attached (ignore the caption) is the result compared against the 3048a internal 10mhz low noise reference. 
> 
> 
> David
> > From: rob at nc0b.com
> > To: time-nuts at febo.com
> > Date: Sat, 16 Jan 2016 20:05:18 +0000
> > Subject: [time-nuts] Phase Noise Comparisons
> > 
> > I did some interpolation to compare the specs for phase noise of the 8660 the way it was done then to the present method. I think it is going to be something like -105 dBc/Hz to -110 dBc/Hz at 10 kHz offset at 14 MHz carrier frequency.
> > 
> > 
> > 
> > As a comparison, the 8662A is about -135 dBc/Hz and the 8642A is better than -150 dBc/Hz.
> > 
> > Actual measurements on multiple generators in my lab.  Unfortunately I have never used or measured an 8660.
> > 
> > 
> > 
> > 3335A -128 dBc/Hz
> > 
> > 3336C -120 dBc/Hz
> > 
> > 3325A -115 dBc/Hz (original version.  Later improved by 4 pr 5 dB 
> > after the 3336C came out.)
> > 
> > 
> > 
> > As a comparison a Rigol DG4162 is -115 dBc/Hz All at 10 kHz offset and on the 20 meter band.
> > 
> > 
> > 
> > It depends what you are trying to measure. Sensitivity or noise floor, anything will work within the range of specified output accuracy and leakage.  On the other hand, if you are trying to measure the dynamic range of a receiver, or its phase noise characteristics, you cannot do that with most generators.
> > 
> > 
> > 
> > Rob, NC0B
> > 
> > 
> > 
> > 
> > 
> > 
> > 
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