Re: [time-nuts] How long do ovens take to cool to ambient, after power is removed?

2014-10-03 Thread Azelio Boriani
The best now is the 8607 BVA OCXO from Oscilloquartz (now part of ADVA optical networking). On Fri, Oct 3, 2014 at 2:33 PM, Dan Kemppainen wrote: > Hi All, > > Considering this old stuff was that good, what's the best that's > currently available now? How does that compare to the best that's ever

Re: [time-nuts] How long do ovens take to cool to ambient, after power is removed?

2014-10-03 Thread Dan Kemppainen
Hi All, Considering this old stuff was that good, what's the best that's currently available now? How does that compare to the best that's ever been? Dan On 10/3/2014 7:19 AM, time-nuts-requ...@febo.com wrote: > Tom, > > Nice performance. Wish we could get that today! My fairly modern BVA i

Re: [time-nuts] How long do ovens take to cool to ambient after power is removed?

2014-10-02 Thread Bob Camp
> > /tvb > > - Original Message - > From: "Richard (Rick) Karlquist" > To: "Discussion of precise time and frequency measurement" > > Cc: > Sent: Wednesday, October 01, 2014 9:03 PM > Subject: Re: [time-nuts] How long do ovens take t

Re: [time-nuts] How long do ovens take to cool to ambient after power is removed?

2014-10-02 Thread Richard (Rick) Karlquist
will still work out-of-the-box in 2064? /tvb - Original Message - From: "Richard (Rick) Karlquist" To: "Discussion of precise time and frequency measurement" Cc: Sent: Wednesday, October 01, 2014 9:03 PM Subject: Re: [time-nuts] How long do ovens take to cool to ambient a

Re: [time-nuts] How long do ovens take to cool to ambient after power is removed?

2014-10-02 Thread Said Jackson via time-nuts
ll still work out-of-the-box in > 2064? > > /tvb > > - Original Message - > From: "Richard (Rick) Karlquist" > To: "Discussion of precise time and frequency measurement" > > Cc: > Sent: Wednesday, October 01, 2014 9:03 PM > Subject: Re:

Re: [time-nuts] How long do ovens take to cool to ambient after power is removed?

2014-10-02 Thread Tom Van Baak
will still work out-of-the-box in 2064? /tvb - Original Message - From: "Richard (Rick) Karlquist" To: "Discussion of precise time and frequency measurement" Cc: Sent: Wednesday, October 01, 2014 9:03 PM Subject: Re: [time-nuts] How long do ovens take to cool to ambi

Re: [time-nuts] How long do ovens take to cool to ambient after power is removed?

2014-10-01 Thread Magnus Danielson
On 10/02/2014 06:03 AM, Richard (Rick) Karlquist wrote: On 10/1/2014 1:04 PM, Hal Murray wrote: drkir...@kirkbymicrowave.co.uk said: Anyway, later today (tomorrow ??) I will post a plot of frequency vs time. The question is though, how long is thing thing likely to take too cool? I'd expec

Re: [time-nuts] How long do ovens take to cool to ambient after power is removed?

2014-10-01 Thread Tom Van Baak
> I'd expect an exponential decay so you need to specify how close to ambient > you want to get. I'd guess a ballpark of 10x the warm up rate. > > You can probably measure it if you have the warmup graph. Turn it off, wait > a while, turn it on, measure the freq, consult warmup graph. Some o

Re: [time-nuts] How long do ovens take to cool to ambient after power is removed?

2014-10-01 Thread Richard (Rick) Karlquist
On 10/1/2014 1:04 PM, Hal Murray wrote: drkir...@kirkbymicrowave.co.uk said: Anyway, later today (tomorrow ??) I will post a plot of frequency vs time. The question is though, how long is thing thing likely to take too cool? I'd expect an exponential decay so you need to specify how close to

Re: [time-nuts] How long do ovens take to cool to ambient after power is removed?

2014-10-01 Thread Hal Murray
drkir...@kirkbymicrowave.co.uk said: > Anyway, later today (tomorrow ??) I will post a plot of frequency vs time. > The question is though, how long is thing thing likely to take too cool? I'd expect an exponential decay so you need to specify how close to ambient you want to get. I'd guess a

Re: [time-nuts] How long do ovens take to cool to ambient after power is removed?

2014-10-01 Thread Tim Shoppa
Typical 10811 warm-up time is circa 10 minutes; cool-down time is actually several times longer (since there is no active "cool-downer" in the case!) More modern, smaller OCXO's will warm up and cool down more quickly. If it's a double oven or user has added extra insulation around the basic OCXO

[time-nuts] How long do ovens take to cool to ambient after power is removed?

2014-10-01 Thread Dr. David Kirkby (Kirkby Microwave Ltd)
Following on from my question the other day about the type of oscillator in the HP 8720D VNA, I finally got around to setting this up on the spectrum analyzer today. Luckily, some software I wrote back in 2008 for a friends HP 7 system was easy to modify to grab the save the frequency. So I can