Re: [time-nuts] time-nuts Digest, Vol 43, Issue 35

2008-02-15 Thread Tom Van Baak
>> ADEV is a good measure because you can make a stable standard >> more accurate if you need to, but you cannot make an accurate >> standard more stable. >> >> snip > > Tom, > > I am having a bit of a problem with your statement above. While it is a nice > catchy phrase and on the surface certa

Re: [time-nuts] time-nuts Digest, Vol 43, Issue 35

2008-02-14 Thread Didier Juges
; To: time-nuts@febo.com > Subject: Re: [time-nuts] time-nuts Digest, Vol 43, Issue 35 > > Pete, > > That's my point. > > Tom has plotted Allan Variance. I have plotted frequency accuracy. > > I get similar Allan Variance results to Tom. But if I just >

Re: [time-nuts] time-nuts Digest, Vol 43, Issue 35

2008-02-14 Thread WB6BNQ
Tom Van Baak wrote: > > snip > > ADEV is a good measure because you can make a stable standard > more accurate if you need to, but you cannot make an accurate > standard more stable. > > snip > Tom, I am having a bit of a problem with your statement above. While it is a nice catchy phrase and o

Re: [time-nuts] time-nuts Digest, Vol 43, Issue 35

2008-02-14 Thread Tom Van Baak
"Martyn Smith" <[EMAIL PROTECTED]> writes: > Tom has plotted Allan Variance. I have plotted frequency accuracy. > > I get similar Allan Variance results to Tom. But if I just measure the > accuracy, e.g peak to peak frequency variations, rubidium's out- perform > OXCO's even when both are discip

Re: [time-nuts] time-nuts Digest, Vol 43, Issue 35

2008-02-14 Thread Pete
Martyn, I have used a PM6681 with HP105B reference to look at: 1. FS700 (OXCO option) as a "typical" modest quality OXCO 2. An FRS-C Rb as a "low cost" Rb device Both measured devices were either undisciplined or awaiting the next application of new EFC; thus I limited the observation times to 2

Re: [time-nuts] time-nuts Digest, Vol 43, Issue 35

2008-02-14 Thread Martyn Smith
Pete, That's my point. Tom has plotted Allan Variance. I have plotted frequency accuracy. I get similar Allan Variance results to Tom. But if I just measure the accuracy, e.g peak to peak frequency variations, rubidium's out- perform OXCO's even when both are disciplined to GPS. I hope I'm no